dm: core: Add livetree access functions
Add a basic assortment of functions to access the live device tree. These come from Linux v4.9 and are modified for U-Boot to the minimum extent possible. While these functions are now very stable in Linux, it will be possible to merge in fixes if needed. Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
parent
5e060d8bcc
commit
644ec0a933
@ -11,3 +11,4 @@ obj-$(CONFIG_$(SPL_)SIMPLE_BUS) += simple-bus.o
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obj-$(CONFIG_DM) += dump.o
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obj-$(CONFIG_$(SPL_)REGMAP) += regmap.o
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obj-$(CONFIG_$(SPL_)SYSCON) += syscon-uclass.o
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obj-$(CONFIG_OF_LIVE) += of_access.o
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735
drivers/core/of_access.c
Normal file
735
drivers/core/of_access.c
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@ -0,0 +1,735 @@
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/*
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* Originally from Linux v4.9
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* Paul Mackerras August 1996.
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* Copyright (C) 1996-2005 Paul Mackerras.
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*
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* Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
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* {engebret|bergner}@us.ibm.com
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*
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* Adapted for sparc and sparc64 by David S. Miller davem@davemloft.net
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*
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* Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and
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* Grant Likely.
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*
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* Modified for U-Boot
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* Copyright (c) 2017 Google, Inc
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*
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* This file follows drivers/of/base.c with functions in the same order as the
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* Linux version.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <libfdt.h>
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#include <dm/of_access.h>
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#include <linux/ctype.h>
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#include <linux/err.h>
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#include <linux/ioport.h>
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DECLARE_GLOBAL_DATA_PTR;
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/* list of struct alias_prop aliases */
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LIST_HEAD(aliases_lookup);
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/* "/aliaes" node */
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static struct device_node *of_aliases;
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/* "/chosen" node */
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static struct device_node *of_chosen;
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/* node pointed to by the stdout-path alias */
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static struct device_node *of_stdout;
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/* pointer to options given after the alias (separated by :) or NULL if none */
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static const char *of_stdout_options;
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/**
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* struct alias_prop - Alias property in 'aliases' node
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*
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* The structure represents one alias property of 'aliases' node as
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* an entry in aliases_lookup list.
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*
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* @link: List node to link the structure in aliases_lookup list
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* @alias: Alias property name
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* @np: Pointer to device_node that the alias stands for
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* @id: Index value from end of alias name
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* @stem: Alias string without the index
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*/
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struct alias_prop {
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struct list_head link;
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const char *alias;
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struct device_node *np;
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int id;
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char stem[0];
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};
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int of_n_addr_cells(const struct device_node *np)
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{
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const __be32 *ip;
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do {
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if (np->parent)
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np = np->parent;
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ip = of_get_property(np, "#address-cells", NULL);
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if (ip)
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return be32_to_cpup(ip);
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} while (np->parent);
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/* No #address-cells property for the root node */
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return OF_ROOT_NODE_ADDR_CELLS_DEFAULT;
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}
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int of_n_size_cells(const struct device_node *np)
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{
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const __be32 *ip;
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do {
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if (np->parent)
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np = np->parent;
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ip = of_get_property(np, "#size-cells", NULL);
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if (ip)
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return be32_to_cpup(ip);
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} while (np->parent);
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/* No #size-cells property for the root node */
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return OF_ROOT_NODE_SIZE_CELLS_DEFAULT;
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}
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struct property *of_find_property(const struct device_node *np,
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const char *name, int *lenp)
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{
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struct property *pp;
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if (!np)
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return NULL;
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for (pp = np->properties; pp; pp = pp->next) {
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if (strcmp(pp->name, name) == 0) {
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if (lenp)
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*lenp = pp->length;
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break;
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}
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}
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if (!pp && lenp)
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*lenp = -FDT_ERR_NOTFOUND;
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return pp;
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}
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struct device_node *of_find_all_nodes(struct device_node *prev)
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{
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struct device_node *np;
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if (!prev) {
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np = gd->of_root;
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} else if (prev->child) {
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np = prev->child;
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} else {
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/*
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* Walk back up looking for a sibling, or the end of the
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* structure
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*/
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np = prev;
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while (np->parent && !np->sibling)
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np = np->parent;
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np = np->sibling; /* Might be null at the end of the tree */
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}
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return np;
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}
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const void *of_get_property(const struct device_node *np, const char *name,
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int *lenp)
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{
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struct property *pp = of_find_property(np, name, lenp);
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return pp ? pp->value : NULL;
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}
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static const char *of_prop_next_string(struct property *prop, const char *cur)
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{
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const void *curv = cur;
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if (!prop)
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return NULL;
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if (!cur)
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return prop->value;
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curv += strlen(cur) + 1;
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if (curv >= prop->value + prop->length)
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return NULL;
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return curv;
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}
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int of_device_is_compatible(const struct device_node *device,
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const char *compat, const char *type,
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const char *name)
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{
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struct property *prop;
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const char *cp;
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int index = 0, score = 0;
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/* Compatible match has highest priority */
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if (compat && compat[0]) {
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prop = of_find_property(device, "compatible", NULL);
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for (cp = of_prop_next_string(prop, NULL); cp;
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cp = of_prop_next_string(prop, cp), index++) {
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if (of_compat_cmp(cp, compat, strlen(compat)) == 0) {
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score = INT_MAX/2 - (index << 2);
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break;
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}
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}
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if (!score)
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return 0;
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}
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/* Matching type is better than matching name */
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if (type && type[0]) {
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if (!device->type || of_node_cmp(type, device->type))
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return 0;
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score += 2;
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}
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/* Matching name is a bit better than not */
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if (name && name[0]) {
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if (!device->name || of_node_cmp(name, device->name))
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return 0;
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score++;
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}
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return score;
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}
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bool of_device_is_available(const struct device_node *device)
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{
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const char *status;
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int statlen;
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if (!device)
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return false;
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status = of_get_property(device, "status", &statlen);
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if (status == NULL)
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return true;
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if (statlen > 0) {
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if (!strcmp(status, "okay"))
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return true;
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}
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return false;
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}
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struct device_node *of_get_parent(const struct device_node *node)
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{
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const struct device_node *np;
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if (!node)
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return NULL;
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np = of_node_get(node->parent);
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return (struct device_node *)np;
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}
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static struct device_node *__of_get_next_child(const struct device_node *node,
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struct device_node *prev)
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{
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struct device_node *next;
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if (!node)
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return NULL;
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next = prev ? prev->sibling : node->child;
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for (; next; next = next->sibling)
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if (of_node_get(next))
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break;
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of_node_put(prev);
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return next;
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}
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#define __for_each_child_of_node(parent, child) \
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for (child = __of_get_next_child(parent, NULL); child != NULL; \
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child = __of_get_next_child(parent, child))
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static struct device_node *__of_find_node_by_path(struct device_node *parent,
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const char *path)
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{
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struct device_node *child;
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int len;
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len = strcspn(path, "/:");
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if (!len)
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return NULL;
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__for_each_child_of_node(parent, child) {
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const char *name = strrchr(child->full_name, '/');
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name++;
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if (strncmp(path, name, len) == 0 && (strlen(name) == len))
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return child;
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}
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return NULL;
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}
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#define for_each_property_of_node(dn, pp) \
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for (pp = dn->properties; pp != NULL; pp = pp->next)
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struct device_node *of_find_node_opts_by_path(const char *path,
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const char **opts)
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{
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struct device_node *np = NULL;
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struct property *pp;
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const char *separator = strchr(path, ':');
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if (opts)
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*opts = separator ? separator + 1 : NULL;
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if (strcmp(path, "/") == 0)
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return of_node_get(gd->of_root);
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/* The path could begin with an alias */
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if (*path != '/') {
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int len;
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const char *p = separator;
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if (!p)
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p = strchrnul(path, '/');
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len = p - path;
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/* of_aliases must not be NULL */
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if (!of_aliases)
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return NULL;
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for_each_property_of_node(of_aliases, pp) {
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if (strlen(pp->name) == len && !strncmp(pp->name, path,
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len)) {
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np = of_find_node_by_path(pp->value);
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break;
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}
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}
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if (!np)
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return NULL;
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path = p;
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}
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/* Step down the tree matching path components */
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if (!np)
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np = of_node_get(gd->of_root);
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while (np && *path == '/') {
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struct device_node *tmp = np;
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path++; /* Increment past '/' delimiter */
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np = __of_find_node_by_path(np, path);
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of_node_put(tmp);
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path = strchrnul(path, '/');
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if (separator && separator < path)
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break;
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}
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return np;
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}
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struct device_node *of_find_compatible_node(struct device_node *from,
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const char *type, const char *compatible)
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{
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struct device_node *np;
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for_each_of_allnodes_from(from, np)
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if (of_device_is_compatible(np, compatible, type, NULL) &&
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of_node_get(np))
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break;
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of_node_put(from);
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return np;
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}
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struct device_node *of_find_node_by_phandle(phandle handle)
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{
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struct device_node *np;
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if (!handle)
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return NULL;
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for_each_of_allnodes(np)
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if (np->phandle == handle)
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break;
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(void)of_node_get(np);
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return np;
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}
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/**
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* of_find_property_value_of_size() - find property of given size
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*
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* Search for a property in a device node and validate the requested size.
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*
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* @np: device node from which the property value is to be read.
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* @propname: name of the property to be searched.
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* @len: requested length of property value
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*
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* @return the property value on success, -EINVAL if the property does not
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* exist, -ENODATA if property does not have a value, and -EOVERFLOW if the
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* property data isn't large enough.
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*/
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static void *of_find_property_value_of_size(const struct device_node *np,
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const char *propname, u32 len)
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{
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struct property *prop = of_find_property(np, propname, NULL);
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if (!prop)
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return ERR_PTR(-EINVAL);
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if (!prop->value)
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return ERR_PTR(-ENODATA);
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if (len > prop->length)
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return ERR_PTR(-EOVERFLOW);
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return prop->value;
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}
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int of_read_u32(const struct device_node *np, const char *propname, u32 *outp)
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{
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const __be32 *val;
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debug("%s: %s: ", __func__, propname);
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if (!np)
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return -EINVAL;
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val = of_find_property_value_of_size(np, propname, sizeof(*outp));
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if (IS_ERR(val)) {
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debug("(not found)\n");
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return PTR_ERR(val);
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}
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*outp = be32_to_cpup(val);
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debug("%#x (%d)\n", *outp, *outp);
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return 0;
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}
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int of_read_u32_array(const struct device_node *np, const char *propname,
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u32 *out_values, size_t sz)
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{
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const __be32 *val;
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debug("%s: %s: ", __func__, propname);
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val = of_find_property_value_of_size(np, propname,
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sz * sizeof(*out_values));
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if (IS_ERR(val))
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return PTR_ERR(val);
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debug("size %zd\n", sz);
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while (sz--)
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*out_values++ = be32_to_cpup(val++);
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return 0;
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}
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int of_property_match_string(const struct device_node *np, const char *propname,
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const char *string)
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{
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const struct property *prop = of_find_property(np, propname, NULL);
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size_t l;
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int i;
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const char *p, *end;
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if (!prop)
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return -EINVAL;
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if (!prop->value)
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return -ENODATA;
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p = prop->value;
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end = p + prop->length;
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for (i = 0; p < end; i++, p += l) {
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l = strnlen(p, end - p) + 1;
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if (p + l > end)
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return -EILSEQ;
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debug("comparing %s with %s\n", string, p);
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if (strcmp(string, p) == 0)
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return i; /* Found it; return index */
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}
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return -ENODATA;
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}
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/**
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* of_property_read_string_helper() - Utility helper for parsing string properties
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* @np: device node from which the property value is to be read.
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* @propname: name of the property to be searched.
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* @out_strs: output array of string pointers.
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* @sz: number of array elements to read.
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* @skip: Number of strings to skip over at beginning of list.
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*
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* Don't call this function directly. It is a utility helper for the
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* of_property_read_string*() family of functions.
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*/
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int of_property_read_string_helper(const struct device_node *np,
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const char *propname, const char **out_strs,
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size_t sz, int skip)
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{
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const struct property *prop = of_find_property(np, propname, NULL);
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int l = 0, i = 0;
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const char *p, *end;
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if (!prop)
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return -EINVAL;
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if (!prop->value)
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return -ENODATA;
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p = prop->value;
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end = p + prop->length;
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for (i = 0; p < end && (!out_strs || i < skip + sz); i++, p += l) {
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l = strnlen(p, end - p) + 1;
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if (p + l > end)
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return -EILSEQ;
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if (out_strs && i >= skip)
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*out_strs++ = p;
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}
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i -= skip;
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return i <= 0 ? -ENODATA : i;
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}
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static int __of_parse_phandle_with_args(const struct device_node *np,
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const char *list_name,
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const char *cells_name,
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int cell_count, int index,
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struct of_phandle_args *out_args)
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{
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const __be32 *list, *list_end;
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int rc = 0, cur_index = 0;
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uint32_t count = 0;
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struct device_node *node = NULL;
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phandle phandle;
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int size;
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/* Retrieve the phandle list property */
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list = of_get_property(np, list_name, &size);
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if (!list)
|
||||
return -ENOENT;
|
||||
list_end = list + size / sizeof(*list);
|
||||
|
||||
/* Loop over the phandles until all the requested entry is found */
|
||||
while (list < list_end) {
|
||||
rc = -EINVAL;
|
||||
count = 0;
|
||||
|
||||
/*
|
||||
* If phandle is 0, then it is an empty entry with no
|
||||
* arguments. Skip forward to the next entry.
|
||||
*/
|
||||
phandle = be32_to_cpup(list++);
|
||||
if (phandle) {
|
||||
/*
|
||||
* Find the provider node and parse the #*-cells
|
||||
* property to determine the argument length.
|
||||
*
|
||||
* This is not needed if the cell count is hard-coded
|
||||
* (i.e. cells_name not set, but cell_count is set),
|
||||
* except when we're going to return the found node
|
||||
* below.
|
||||
*/
|
||||
if (cells_name || cur_index == index) {
|
||||
node = of_find_node_by_phandle(phandle);
|
||||
if (!node) {
|
||||
debug("%s: could not find phandle\n",
|
||||
np->full_name);
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
|
||||
if (cells_name) {
|
||||
if (of_read_u32(node, cells_name, &count)) {
|
||||
debug("%s: could not get %s for %s\n",
|
||||
np->full_name, cells_name,
|
||||
node->full_name);
|
||||
goto err;
|
||||
}
|
||||
} else {
|
||||
count = cell_count;
|
||||
}
|
||||
|
||||
/*
|
||||
* Make sure that the arguments actually fit in the
|
||||
* remaining property data length
|
||||
*/
|
||||
if (list + count > list_end) {
|
||||
debug("%s: arguments longer than property\n",
|
||||
np->full_name);
|
||||
goto err;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* All of the error cases above bail out of the loop, so at
|
||||
* this point, the parsing is successful. If the requested
|
||||
* index matches, then fill the out_args structure and return,
|
||||
* or return -ENOENT for an empty entry.
|
||||
*/
|
||||
rc = -ENOENT;
|
||||
if (cur_index == index) {
|
||||
if (!phandle)
|
||||
goto err;
|
||||
|
||||
if (out_args) {
|
||||
int i;
|
||||
if (WARN_ON(count > OF_MAX_PHANDLE_ARGS))
|
||||
count = OF_MAX_PHANDLE_ARGS;
|
||||
out_args->np = node;
|
||||
out_args->args_count = count;
|
||||
for (i = 0; i < count; i++)
|
||||
out_args->args[i] =
|
||||
be32_to_cpup(list++);
|
||||
} else {
|
||||
of_node_put(node);
|
||||
}
|
||||
|
||||
/* Found it! return success */
|
||||
return 0;
|
||||
}
|
||||
|
||||
of_node_put(node);
|
||||
node = NULL;
|
||||
list += count;
|
||||
cur_index++;
|
||||
}
|
||||
|
||||
/*
|
||||
* Unlock node before returning result; will be one of:
|
||||
* -ENOENT : index is for empty phandle
|
||||
* -EINVAL : parsing error on data
|
||||
* [1..n] : Number of phandle (count mode; when index = -1)
|
||||
*/
|
||||
rc = index < 0 ? cur_index : -ENOENT;
|
||||
err:
|
||||
if (node)
|
||||
of_node_put(node);
|
||||
return rc;
|
||||
}
|
||||
|
||||
struct device_node *of_parse_phandle(const struct device_node *np,
|
||||
const char *phandle_name, int index)
|
||||
{
|
||||
struct of_phandle_args args;
|
||||
|
||||
if (index < 0)
|
||||
return NULL;
|
||||
|
||||
if (__of_parse_phandle_with_args(np, phandle_name, NULL, 0, index,
|
||||
&args))
|
||||
return NULL;
|
||||
|
||||
return args.np;
|
||||
}
|
||||
|
||||
int of_parse_phandle_with_args(const struct device_node *np,
|
||||
const char *list_name, const char *cells_name,
|
||||
int index, struct of_phandle_args *out_args)
|
||||
{
|
||||
if (index < 0)
|
||||
return -EINVAL;
|
||||
|
||||
return __of_parse_phandle_with_args(np, list_name, cells_name, 0,
|
||||
index, out_args);
|
||||
}
|
||||
|
||||
static void of_alias_add(struct alias_prop *ap, struct device_node *np,
|
||||
int id, const char *stem, int stem_len)
|
||||
{
|
||||
ap->np = np;
|
||||
ap->id = id;
|
||||
strncpy(ap->stem, stem, stem_len);
|
||||
ap->stem[stem_len] = 0;
|
||||
list_add_tail(&ap->link, &aliases_lookup);
|
||||
debug("adding DT alias:%s: stem=%s id=%i node=%s\n",
|
||||
ap->alias, ap->stem, ap->id, of_node_full_name(np));
|
||||
}
|
||||
|
||||
int of_alias_scan(void)
|
||||
{
|
||||
struct property *pp;
|
||||
|
||||
of_aliases = of_find_node_by_path("/aliases");
|
||||
of_chosen = of_find_node_by_path("/chosen");
|
||||
if (of_chosen == NULL)
|
||||
of_chosen = of_find_node_by_path("/chosen@0");
|
||||
|
||||
if (of_chosen) {
|
||||
const char *name;
|
||||
|
||||
name = of_get_property(of_chosen, "stdout-path", NULL);
|
||||
if (name)
|
||||
of_stdout = of_find_node_opts_by_path(name,
|
||||
&of_stdout_options);
|
||||
}
|
||||
|
||||
if (!of_aliases)
|
||||
return 0;
|
||||
|
||||
for_each_property_of_node(of_aliases, pp) {
|
||||
const char *start = pp->name;
|
||||
const char *end = start + strlen(start);
|
||||
struct device_node *np;
|
||||
struct alias_prop *ap;
|
||||
ulong id;
|
||||
int len;
|
||||
|
||||
/* Skip those we do not want to proceed */
|
||||
if (!strcmp(pp->name, "name") ||
|
||||
!strcmp(pp->name, "phandle") ||
|
||||
!strcmp(pp->name, "linux,phandle"))
|
||||
continue;
|
||||
|
||||
np = of_find_node_by_path(pp->value);
|
||||
if (!np)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* walk the alias backwards to extract the id and work out
|
||||
* the 'stem' string
|
||||
*/
|
||||
while (isdigit(*(end-1)) && end > start)
|
||||
end--;
|
||||
len = end - start;
|
||||
|
||||
if (strict_strtoul(end, 10, &id) < 0)
|
||||
continue;
|
||||
|
||||
/* Allocate an alias_prop with enough space for the stem */
|
||||
ap = malloc(sizeof(*ap) + len + 1);
|
||||
if (!ap)
|
||||
return -ENOMEM;
|
||||
memset(ap, 0, sizeof(*ap) + len + 1);
|
||||
ap->alias = start;
|
||||
of_alias_add(ap, np, id, start, len);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int of_alias_get_id(const struct device_node *np, const char *stem)
|
||||
{
|
||||
struct alias_prop *app;
|
||||
int id = -ENODEV;
|
||||
|
||||
mutex_lock(&of_mutex);
|
||||
list_for_each_entry(app, &aliases_lookup, link) {
|
||||
if (strcmp(app->stem, stem) != 0)
|
||||
continue;
|
||||
|
||||
if (np == app->np) {
|
||||
id = app->id;
|
||||
break;
|
||||
}
|
||||
}
|
||||
mutex_unlock(&of_mutex);
|
||||
|
||||
return id;
|
||||
}
|
||||
|
||||
struct device_node *of_get_stdout(void)
|
||||
{
|
||||
return of_stdout;
|
||||
}
|
||||
347
include/dm/of_access.h
Normal file
347
include/dm/of_access.h
Normal file
@ -0,0 +1,347 @@
|
||||
/*
|
||||
* Originally from Linux v4.9
|
||||
* Copyright (C) 1996-2005 Paul Mackerras.
|
||||
*
|
||||
* Updates for PPC64 by Peter Bergner & David Engebretsen, IBM Corp.
|
||||
* Updates for SPARC64 by David S. Miller
|
||||
* Derived from PowerPC and Sparc prom.h files by Stephen Rothwell, IBM Corp.
|
||||
*
|
||||
* Copyright (c) 2017 Google, Inc
|
||||
* Written by Simon Glass <sjg@chromium.org>
|
||||
*
|
||||
* Modified for U-Boot
|
||||
* Copyright (c) 2017 Google, Inc
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-2.0+
|
||||
*/
|
||||
|
||||
#ifndef _DM_OF_ACCESS_H
|
||||
#define _DM_OF_ACCESS_H
|
||||
|
||||
#include <dm/of.h>
|
||||
|
||||
/**
|
||||
* of_find_all_nodes - Get next node in global list
|
||||
* @prev: Previous node or NULL to start iteration
|
||||
* of_node_put() will be called on it
|
||||
*
|
||||
* Returns a node pointer with refcount incremented, use
|
||||
* of_node_put() on it when done.
|
||||
*/
|
||||
struct device_node *of_find_all_nodes(struct device_node *prev);
|
||||
|
||||
#define for_each_of_allnodes_from(from, dn) \
|
||||
for (dn = of_find_all_nodes(from); dn; dn = of_find_all_nodes(dn))
|
||||
#define for_each_of_allnodes(dn) for_each_of_allnodes_from(NULL, dn)
|
||||
|
||||
/* Dummy functions to mirror Linux. These are not used in U-Boot */
|
||||
#define of_node_get(x) (x)
|
||||
static inline void of_node_put(const struct device_node *np) { }
|
||||
|
||||
/**
|
||||
* of_n_addr_cells() - Get the number of address cells for a node
|
||||
*
|
||||
* This walks back up the tree to find the closest #address-cells property
|
||||
* which controls the given node.
|
||||
*
|
||||
* @np: Node pointer to check
|
||||
* @return number of address cells this node uses
|
||||
*/
|
||||
int of_n_addr_cells(const struct device_node *np);
|
||||
|
||||
/**
|
||||
* of_n_size_cells() - Get the number of size cells for a node
|
||||
*
|
||||
* This walks back up the tree to find the closest #size-cells property
|
||||
* which controls the given node.
|
||||
*
|
||||
* @np: Node pointer to check
|
||||
* @return number of size cells this node uses
|
||||
*/
|
||||
int of_n_size_cells(const struct device_node *np);
|
||||
|
||||
/**
|
||||
* of_find_property() - find a property in a node
|
||||
*
|
||||
* @np: Pointer to device node holding property
|
||||
* @name: Name of property
|
||||
* @lenp: If non-NULL, returns length of property
|
||||
* @return pointer to property, or NULL if not found
|
||||
*/
|
||||
struct property *of_find_property(const struct device_node *np,
|
||||
const char *name, int *lenp);
|
||||
|
||||
/**
|
||||
* of_get_property() - get a property value
|
||||
*
|
||||
* Find a property with a given name for a given node and return the value.
|
||||
*
|
||||
* @np: Pointer to device node holding property
|
||||
* @name: Name of property
|
||||
* @lenp: If non-NULL, returns length of property
|
||||
* @return pointer to property value, or NULL if not found
|
||||
*/
|
||||
const void *of_get_property(const struct device_node *np, const char *name,
|
||||
int *lenp);
|
||||
|
||||
/**
|
||||
* of_device_is_compatible() - Check if the node matches given constraints
|
||||
* @device: pointer to node
|
||||
* @compat: required compatible string, NULL or "" for any match
|
||||
* @type: required device_type value, NULL or "" for any match
|
||||
* @name: required node name, NULL or "" for any match
|
||||
*
|
||||
* Checks if the given @compat, @type and @name strings match the
|
||||
* properties of the given @device. A constraints can be skipped by
|
||||
* passing NULL or an empty string as the constraint.
|
||||
*
|
||||
* @return 0 for no match, and a positive integer on match. The return
|
||||
* value is a relative score with larger values indicating better
|
||||
* matches. The score is weighted for the most specific compatible value
|
||||
* to get the highest score. Matching type is next, followed by matching
|
||||
* name. Practically speaking, this results in the following priority
|
||||
* order for matches:
|
||||
*
|
||||
* 1. specific compatible && type && name
|
||||
* 2. specific compatible && type
|
||||
* 3. specific compatible && name
|
||||
* 4. specific compatible
|
||||
* 5. general compatible && type && name
|
||||
* 6. general compatible && type
|
||||
* 7. general compatible && name
|
||||
* 8. general compatible
|
||||
* 9. type && name
|
||||
* 10. type
|
||||
* 11. name
|
||||
*/
|
||||
int of_device_is_compatible(const struct device_node *np, const char *compat,
|
||||
const char *type, const char *name);
|
||||
|
||||
/**
|
||||
* of_device_is_available() - check if a device is available for use
|
||||
*
|
||||
* @device: Node to check for availability
|
||||
*
|
||||
* @return true if the status property is absent or set to "okay", false
|
||||
* otherwise
|
||||
*/
|
||||
bool of_device_is_available(const struct device_node *np);
|
||||
|
||||
/**
|
||||
* of_get_parent() - Get a node's parent, if any
|
||||
*
|
||||
* @node: Node to check
|
||||
* @eturns a node pointer, or NULL if none
|
||||
*/
|
||||
struct device_node *of_get_parent(const struct device_node *np);
|
||||
|
||||
/**
|
||||
* of_find_node_opts_by_path() - Find a node matching a full OF path
|
||||
*
|
||||
* @path: Either the full path to match, or if the path does not start with
|
||||
* '/', the name of a property of the /aliases node (an alias). In the
|
||||
* case of an alias, the node matching the alias' value will be returned.
|
||||
* @opts: Address of a pointer into which to store the start of an options
|
||||
* string appended to the end of the path with a ':' separator. Can be NULL
|
||||
*
|
||||
* Valid paths:
|
||||
* /foo/bar Full path
|
||||
* foo Valid alias
|
||||
* foo/bar Valid alias + relative path
|
||||
*
|
||||
* @return a node pointer or NULL if not found
|
||||
*/
|
||||
struct device_node *of_find_node_opts_by_path(const char *path,
|
||||
const char **opts);
|
||||
|
||||
static inline struct device_node *of_find_node_by_path(const char *path)
|
||||
{
|
||||
return of_find_node_opts_by_path(path, NULL);
|
||||
}
|
||||
|
||||
/**
|
||||
* of_find_compatible_node() - find a node based on its compatible string
|
||||
*
|
||||
* Find a node based on type and one of the tokens in its "compatible" property
|
||||
* @from: Node to start searching from or NULL. the node you pass will not be
|
||||
* searched, only the next one will; typically, you pass what the previous
|
||||
* call returned.
|
||||
* @type: The type string to match "device_type" or NULL to ignore
|
||||
* @compatible: The string to match to one of the tokens in the device
|
||||
* "compatible" list.
|
||||
* @return node pointer or NULL if not found
|
||||
*/
|
||||
struct device_node *of_find_compatible_node(struct device_node *from,
|
||||
const char *type, const char *compatible);
|
||||
|
||||
/**
|
||||
* of_find_node_by_phandle() - Find a node given a phandle
|
||||
*
|
||||
* @handle: phandle of the node to find
|
||||
*
|
||||
* @return node pointer, or NULL if not found
|
||||
*/
|
||||
struct device_node *of_find_node_by_phandle(phandle handle);
|
||||
|
||||
/**
|
||||
* of_read_u32() - Find and read a 32-bit integer from a property
|
||||
*
|
||||
* Search for a property in a device node and read a 32-bit value from
|
||||
* it.
|
||||
*
|
||||
* @np: device node from which the property value is to be read.
|
||||
* @propname: name of the property to be searched.
|
||||
* @outp: pointer to return value, modified only if return value is 0.
|
||||
*
|
||||
* @return 0 on success, -EINVAL if the property does not exist,
|
||||
* -ENODATA if property does not have a value, and -EOVERFLOW if the
|
||||
* property data isn't large enough.
|
||||
*/
|
||||
int of_read_u32(const struct device_node *np, const char *propname, u32 *outp);
|
||||
|
||||
/**
|
||||
* of_read_u32_array() - Find and read an array of 32 bit integers
|
||||
*
|
||||
* Search for a property in a device node and read 32-bit value(s) from
|
||||
* it.
|
||||
*
|
||||
* @np: device node from which the property value is to be read.
|
||||
* @propname: name of the property to be searched.
|
||||
* @out_values: pointer to return value, modified only if return value is 0.
|
||||
* @sz: number of array elements to read
|
||||
* @return 0 on success, -EINVAL if the property does not exist, -ENODATA
|
||||
* if property does not have a value, and -EOVERFLOW is longer than sz.
|
||||
*/
|
||||
int of_read_u32_array(const struct device_node *np, const char *propname,
|
||||
u32 *out_values, size_t sz);
|
||||
|
||||
/**
|
||||
* of_property_match_string() - Find string in a list and return index
|
||||
*
|
||||
* This function searches a string list property and returns the index
|
||||
* of a specific string value.
|
||||
*
|
||||
* @np: pointer to node containing string list property
|
||||
* @propname: string list property name
|
||||
* @string: pointer to string to search for in string list
|
||||
* @return 0 on success, -EINVAL if the property does not exist, -ENODATA
|
||||
* if property does not have a value, and -EOVERFLOW is longer than sz.
|
||||
*/
|
||||
int of_property_match_string(const struct device_node *np, const char *propname,
|
||||
const char *string);
|
||||
|
||||
int of_property_read_string_helper(const struct device_node *np,
|
||||
const char *propname, const char **out_strs,
|
||||
size_t sz, int index);
|
||||
|
||||
/**
|
||||
* of_property_read_string_index() - Find and read a string from a multiple
|
||||
* strings property.
|
||||
* @np: device node from which the property value is to be read.
|
||||
* @propname: name of the property to be searched.
|
||||
* @index: index of the string in the list of strings
|
||||
* @out_string: pointer to null terminated return string, modified only if
|
||||
* return value is 0.
|
||||
*
|
||||
* Search for a property in a device tree node and retrieve a null
|
||||
* terminated string value (pointer to data, not a copy) in the list of strings
|
||||
* contained in that property.
|
||||
* Returns 0 on success, -EINVAL if the property does not exist, -ENODATA if
|
||||
* property does not have a value, and -EILSEQ if the string is not
|
||||
* null-terminated within the length of the property data.
|
||||
*
|
||||
* The out_string pointer is modified only if a valid string can be decoded.
|
||||
*/
|
||||
static inline int of_property_read_string_index(const struct device_node *np,
|
||||
const char *propname,
|
||||
int index, const char **output)
|
||||
{
|
||||
int rc = of_property_read_string_helper(np, propname, output, 1, index);
|
||||
return rc < 0 ? rc : 0;
|
||||
}
|
||||
|
||||
/**
|
||||
* of_parse_phandle - Resolve a phandle property to a device_node pointer
|
||||
* @np: Pointer to device node holding phandle property
|
||||
* @phandle_name: Name of property holding a phandle value
|
||||
* @index: For properties holding a table of phandles, this is the index into
|
||||
* the table
|
||||
*
|
||||
* Returns the device_node pointer with refcount incremented. Use
|
||||
* of_node_put() on it when done.
|
||||
*/
|
||||
struct device_node *of_parse_phandle(const struct device_node *np,
|
||||
const char *phandle_name, int index);
|
||||
|
||||
/**
|
||||
* of_parse_phandle_with_args() - Find a node pointed by phandle in a list
|
||||
*
|
||||
* @np: pointer to a device tree node containing a list
|
||||
* @list_name: property name that contains a list
|
||||
* @cells_name: property name that specifies phandles' arguments count
|
||||
* @index: index of a phandle to parse out
|
||||
* @out_args: optional pointer to output arguments structure (will be filled)
|
||||
* @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
|
||||
* @list_name does not exist, -EINVAL if a phandle was not found,
|
||||
* @cells_name could not be found, the arguments were truncated or there
|
||||
* were too many arguments.
|
||||
*
|
||||
* This function is useful to parse lists of phandles and their arguments.
|
||||
* Returns 0 on success and fills out_args, on error returns appropriate
|
||||
* errno value.
|
||||
*
|
||||
* Caller is responsible to call of_node_put() on the returned out_args->np
|
||||
* pointer.
|
||||
*
|
||||
* Example:
|
||||
*
|
||||
* phandle1: node1 {
|
||||
* #list-cells = <2>;
|
||||
* }
|
||||
*
|
||||
* phandle2: node2 {
|
||||
* #list-cells = <1>;
|
||||
* }
|
||||
*
|
||||
* node3 {
|
||||
* list = <&phandle1 1 2 &phandle2 3>;
|
||||
* }
|
||||
*
|
||||
* To get a device_node of the `node2' node you may call this:
|
||||
* of_parse_phandle_with_args(node3, "list", "#list-cells", 1, &args);
|
||||
*/
|
||||
int of_parse_phandle_with_args(const struct device_node *np,
|
||||
const char *list_name, const char *cells_name,
|
||||
int index, struct of_phandle_args *out_args);
|
||||
|
||||
/**
|
||||
* of_alias_scan() - Scan all properties of the 'aliases' node
|
||||
*
|
||||
* The function scans all the properties of the 'aliases' node and populates
|
||||
* the lookup table with the properties. It returns the number of alias
|
||||
* properties found, or an error code in case of failure.
|
||||
*
|
||||
* @return 9 if OK, -ENOMEM if not enough memory
|
||||
*/
|
||||
int of_alias_scan(void);
|
||||
|
||||
/**
|
||||
* of_alias_get_id - Get alias id for the given device_node
|
||||
*
|
||||
* Travels the lookup table to get the alias id for the given device_node and
|
||||
* alias stem.
|
||||
*
|
||||
* @np: Pointer to the given device_node
|
||||
* @stem: Alias stem of the given device_node
|
||||
* @return alias ID, if found, else -ENODEV
|
||||
*/
|
||||
int of_alias_get_id(const struct device_node *np, const char *stem);
|
||||
|
||||
/**
|
||||
* of_get_stdout() - Get node to use for stdout
|
||||
*
|
||||
* @return node referred to by stdout-path alias, or NULL if none
|
||||
*/
|
||||
struct device_node *of_get_stdout(void);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user