forked from Minki/linux
67dcc26d20
Constify device_get_match_data() as OF and ACPI variants return constant value. Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
1005 lines
29 KiB
C
1005 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* drivers/of/property.c - Procedures for accessing and interpreting
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* Devicetree properties and graphs.
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*
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* Initially created by copying procedures from drivers/of/base.c. This
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* file contains the OF property as well as the OF graph interface
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* functions.
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*
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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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#define pr_fmt(fmt) "OF: " fmt
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_graph.h>
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#include <linux/string.h>
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#include "of_private.h"
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/**
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* of_property_count_elems_of_size - Count the number of elements in a property
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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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* @elem_size: size of the individual element
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*
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* Search for a property in a device node and count the number of elements of
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* size elem_size in it. Returns number of elements on sucess, -EINVAL if the
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* property does not exist or its length does not match a multiple of elem_size
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* and -ENODATA if the property does not have a value.
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*/
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int of_property_count_elems_of_size(const struct device_node *np,
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const char *propname, int elem_size)
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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 -EINVAL;
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if (!prop->value)
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return -ENODATA;
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if (prop->length % elem_size != 0) {
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pr_err("size of %s in node %pOF is not a multiple of %d\n",
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propname, np, elem_size);
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return -EINVAL;
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}
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return prop->length / elem_size;
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}
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EXPORT_SYMBOL_GPL(of_property_count_elems_of_size);
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/**
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* of_find_property_value_of_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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* @min: minimum allowed length of property value
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* @max: maximum allowed length of property value (0 means unlimited)
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* @len: if !=NULL, actual length is written to here
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*
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* Search for a property in a device node and valid the requested size.
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* Returns 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 is too small or too large.
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*
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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 min, u32 max, size_t *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 (prop->length < min)
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return ERR_PTR(-EOVERFLOW);
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if (max && prop->length > max)
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return ERR_PTR(-EOVERFLOW);
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if (len)
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*len = prop->length;
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return prop->value;
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}
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/**
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* of_property_read_u32_index - Find and read a u32 from a multi-value property.
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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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* @index: index of the u32 in the list of values
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* @out_value: pointer to return value, modified only if no error.
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*
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* Search for a property in a device node and read nth 32-bit value from
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* it. Returns 0 on success, -EINVAL if the property does not exist,
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* -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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* The out_value is modified only if a valid u32 value can be decoded.
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*/
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int of_property_read_u32_index(const struct device_node *np,
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const char *propname,
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u32 index, u32 *out_value)
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{
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const u32 *val = of_find_property_value_of_size(np, propname,
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((index + 1) * sizeof(*out_value)),
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0,
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NULL);
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if (IS_ERR(val))
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return PTR_ERR(val);
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*out_value = be32_to_cpup(((__be32 *)val) + index);
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_property_read_u32_index);
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/**
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* of_property_read_u64_index - Find and read a u64 from a multi-value property.
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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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* @index: index of the u64 in the list of values
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* @out_value: pointer to return value, modified only if no error.
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*
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* Search for a property in a device node and read nth 64-bit value from
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* it. Returns 0 on success, -EINVAL if the property does not exist,
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* -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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* The out_value is modified only if a valid u64 value can be decoded.
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*/
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int of_property_read_u64_index(const struct device_node *np,
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const char *propname,
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u32 index, u64 *out_value)
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{
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const u64 *val = of_find_property_value_of_size(np, propname,
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((index + 1) * sizeof(*out_value)),
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0, NULL);
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if (IS_ERR(val))
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return PTR_ERR(val);
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*out_value = be64_to_cpup(((__be64 *)val) + index);
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_property_read_u64_index);
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/**
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* of_property_read_variable_u8_array - Find and read an array of u8 from a
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* property, with bounds on the minimum and maximum array 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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* @out_values: pointer to return value, modified only if return value is 0.
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* @sz_min: minimum number of array elements to read
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* @sz_max: maximum number of array elements to read, if zero there is no
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* upper limit on the number of elements in the dts entry but only
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* sz_min will be read.
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*
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* Search for a property in a device node and read 8-bit value(s) from
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* it. Returns number of elements read on success, -EINVAL if the property
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* does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
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* if the property data is smaller than sz_min or longer than sz_max.
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*
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* dts entry of array should be like:
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* property = /bits/ 8 <0x50 0x60 0x70>;
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*
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* The out_values is modified only if a valid u8 value can be decoded.
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*/
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int of_property_read_variable_u8_array(const struct device_node *np,
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const char *propname, u8 *out_values,
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size_t sz_min, size_t sz_max)
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{
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size_t sz, count;
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const u8 *val = of_find_property_value_of_size(np, propname,
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(sz_min * sizeof(*out_values)),
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(sz_max * sizeof(*out_values)),
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&sz);
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if (IS_ERR(val))
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return PTR_ERR(val);
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if (!sz_max)
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sz = sz_min;
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else
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sz /= sizeof(*out_values);
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count = sz;
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while (count--)
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*out_values++ = *val++;
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return sz;
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}
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EXPORT_SYMBOL_GPL(of_property_read_variable_u8_array);
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/**
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* of_property_read_variable_u16_array - Find and read an array of u16 from a
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* property, with bounds on the minimum and maximum array 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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* @out_values: pointer to return value, modified only if return value is 0.
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* @sz_min: minimum number of array elements to read
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* @sz_max: maximum number of array elements to read, if zero there is no
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* upper limit on the number of elements in the dts entry but only
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* sz_min will be read.
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*
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* Search for a property in a device node and read 16-bit value(s) from
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* it. Returns number of elements read on success, -EINVAL if the property
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* does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
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* if the property data is smaller than sz_min or longer than sz_max.
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*
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* dts entry of array should be like:
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* property = /bits/ 16 <0x5000 0x6000 0x7000>;
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*
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* The out_values is modified only if a valid u16 value can be decoded.
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*/
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int of_property_read_variable_u16_array(const struct device_node *np,
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const char *propname, u16 *out_values,
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size_t sz_min, size_t sz_max)
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{
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size_t sz, count;
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const __be16 *val = of_find_property_value_of_size(np, propname,
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(sz_min * sizeof(*out_values)),
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(sz_max * sizeof(*out_values)),
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&sz);
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if (IS_ERR(val))
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return PTR_ERR(val);
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if (!sz_max)
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sz = sz_min;
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else
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sz /= sizeof(*out_values);
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count = sz;
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while (count--)
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*out_values++ = be16_to_cpup(val++);
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return sz;
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}
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EXPORT_SYMBOL_GPL(of_property_read_variable_u16_array);
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/**
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* of_property_read_variable_u32_array - Find and read an array of 32 bit
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* integers from a property, with bounds on the minimum and maximum array 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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* @out_values: pointer to return value, modified only if return value is 0.
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* @sz_min: minimum number of array elements to read
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* @sz_max: maximum number of array elements to read, if zero there is no
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* upper limit on the number of elements in the dts entry but only
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* sz_min will be read.
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*
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* Search for a property in a device node and read 32-bit value(s) from
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* it. Returns number of elements read on success, -EINVAL if the property
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* does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
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* if the property data is smaller than sz_min or longer than sz_max.
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*
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* The out_values is modified only if a valid u32 value can be decoded.
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*/
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int of_property_read_variable_u32_array(const struct device_node *np,
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const char *propname, u32 *out_values,
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size_t sz_min, size_t sz_max)
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{
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size_t sz, count;
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const __be32 *val = of_find_property_value_of_size(np, propname,
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(sz_min * sizeof(*out_values)),
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(sz_max * sizeof(*out_values)),
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&sz);
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if (IS_ERR(val))
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return PTR_ERR(val);
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if (!sz_max)
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sz = sz_min;
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else
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sz /= sizeof(*out_values);
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count = sz;
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while (count--)
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*out_values++ = be32_to_cpup(val++);
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return sz;
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}
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EXPORT_SYMBOL_GPL(of_property_read_variable_u32_array);
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/**
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* of_property_read_u64 - Find and read a 64 bit integer from a property
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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_value: pointer to return value, modified only if return value is 0.
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*
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* Search for a property in a device node and read a 64-bit value from
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* it. Returns 0 on success, -EINVAL if the property does not exist,
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* -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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* The out_value is modified only if a valid u64 value can be decoded.
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*/
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int of_property_read_u64(const struct device_node *np, const char *propname,
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u64 *out_value)
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{
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const __be32 *val = of_find_property_value_of_size(np, propname,
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sizeof(*out_value),
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0,
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NULL);
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if (IS_ERR(val))
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return PTR_ERR(val);
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*out_value = of_read_number(val, 2);
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_property_read_u64);
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/**
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* of_property_read_variable_u64_array - Find and read an array of 64 bit
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* integers from a property, with bounds on the minimum and maximum array 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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* @out_values: pointer to return value, modified only if return value is 0.
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* @sz_min: minimum number of array elements to read
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* @sz_max: maximum number of array elements to read, if zero there is no
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* upper limit on the number of elements in the dts entry but only
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* sz_min will be read.
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*
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* Search for a property in a device node and read 64-bit value(s) from
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* it. Returns number of elements read on success, -EINVAL if the property
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* does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
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* if the property data is smaller than sz_min or longer than sz_max.
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*
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* The out_values is modified only if a valid u64 value can be decoded.
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*/
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int of_property_read_variable_u64_array(const struct device_node *np,
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const char *propname, u64 *out_values,
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size_t sz_min, size_t sz_max)
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{
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size_t sz, count;
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const __be32 *val = of_find_property_value_of_size(np, propname,
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(sz_min * sizeof(*out_values)),
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(sz_max * sizeof(*out_values)),
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&sz);
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if (IS_ERR(val))
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return PTR_ERR(val);
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if (!sz_max)
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sz = sz_min;
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else
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sz /= sizeof(*out_values);
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count = sz;
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while (count--) {
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*out_values++ = of_read_number(val, 2);
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val += 2;
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}
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return sz;
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}
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EXPORT_SYMBOL_GPL(of_property_read_variable_u64_array);
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/**
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* of_property_read_string - Find and read a string from a property
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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_string: pointer to null terminated return string, modified only if
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* return value is 0.
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*
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* Search for a property in a device tree node and retrieve a null
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* terminated string value (pointer to data, not a copy). Returns 0 on
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* success, -EINVAL if the property does not exist, -ENODATA if property
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* does not have a value, and -EILSEQ if the string is not null-terminated
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* within the length of the property data.
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*
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* The out_string pointer is modified only if a valid string can be decoded.
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*/
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int of_property_read_string(const struct device_node *np, const char *propname,
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const char **out_string)
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{
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const struct property *prop = of_find_property(np, propname, NULL);
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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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if (strnlen(prop->value, prop->length) >= prop->length)
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return -EILSEQ;
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*out_string = prop->value;
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return 0;
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}
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EXPORT_SYMBOL_GPL(of_property_read_string);
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/**
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* of_property_match_string() - Find string in a list and return index
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* @np: pointer to node containing string list property
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* @propname: string list property name
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* @string: pointer to string to search for in string list
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*
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* This function searches a string list property and returns the index
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* of a specific string value.
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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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pr_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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EXPORT_SYMBOL_GPL(of_property_match_string);
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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)
|
|
return -EILSEQ;
|
|
if (out_strs && i >= skip)
|
|
*out_strs++ = p;
|
|
}
|
|
i -= skip;
|
|
return i <= 0 ? -ENODATA : i;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_property_read_string_helper);
|
|
|
|
const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
|
|
u32 *pu)
|
|
{
|
|
const void *curv = cur;
|
|
|
|
if (!prop)
|
|
return NULL;
|
|
|
|
if (!cur) {
|
|
curv = prop->value;
|
|
goto out_val;
|
|
}
|
|
|
|
curv += sizeof(*cur);
|
|
if (curv >= prop->value + prop->length)
|
|
return NULL;
|
|
|
|
out_val:
|
|
*pu = be32_to_cpup(curv);
|
|
return curv;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_prop_next_u32);
|
|
|
|
const char *of_prop_next_string(struct property *prop, const char *cur)
|
|
{
|
|
const void *curv = cur;
|
|
|
|
if (!prop)
|
|
return NULL;
|
|
|
|
if (!cur)
|
|
return prop->value;
|
|
|
|
curv += strlen(cur) + 1;
|
|
if (curv >= prop->value + prop->length)
|
|
return NULL;
|
|
|
|
return curv;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_prop_next_string);
|
|
|
|
/**
|
|
* of_graph_parse_endpoint() - parse common endpoint node properties
|
|
* @node: pointer to endpoint device_node
|
|
* @endpoint: pointer to the OF endpoint data structure
|
|
*
|
|
* The caller should hold a reference to @node.
|
|
*/
|
|
int of_graph_parse_endpoint(const struct device_node *node,
|
|
struct of_endpoint *endpoint)
|
|
{
|
|
struct device_node *port_node = of_get_parent(node);
|
|
|
|
WARN_ONCE(!port_node, "%s(): endpoint %pOF has no parent node\n",
|
|
__func__, node);
|
|
|
|
memset(endpoint, 0, sizeof(*endpoint));
|
|
|
|
endpoint->local_node = node;
|
|
/*
|
|
* It doesn't matter whether the two calls below succeed.
|
|
* If they don't then the default value 0 is used.
|
|
*/
|
|
of_property_read_u32(port_node, "reg", &endpoint->port);
|
|
of_property_read_u32(node, "reg", &endpoint->id);
|
|
|
|
of_node_put(port_node);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(of_graph_parse_endpoint);
|
|
|
|
/**
|
|
* of_graph_get_port_by_id() - get the port matching a given id
|
|
* @parent: pointer to the parent device node
|
|
* @id: id of the port
|
|
*
|
|
* Return: A 'port' node pointer with refcount incremented. The caller
|
|
* has to use of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id)
|
|
{
|
|
struct device_node *node, *port;
|
|
|
|
node = of_get_child_by_name(parent, "ports");
|
|
if (node)
|
|
parent = node;
|
|
|
|
for_each_child_of_node(parent, port) {
|
|
u32 port_id = 0;
|
|
|
|
if (of_node_cmp(port->name, "port") != 0)
|
|
continue;
|
|
of_property_read_u32(port, "reg", &port_id);
|
|
if (id == port_id)
|
|
break;
|
|
}
|
|
|
|
of_node_put(node);
|
|
|
|
return port;
|
|
}
|
|
EXPORT_SYMBOL(of_graph_get_port_by_id);
|
|
|
|
/**
|
|
* of_graph_get_next_endpoint() - get next endpoint node
|
|
* @parent: pointer to the parent device node
|
|
* @prev: previous endpoint node, or NULL to get first
|
|
*
|
|
* Return: An 'endpoint' node pointer with refcount incremented. Refcount
|
|
* of the passed @prev node is decremented.
|
|
*/
|
|
struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
|
|
struct device_node *prev)
|
|
{
|
|
struct device_node *endpoint;
|
|
struct device_node *port;
|
|
|
|
if (!parent)
|
|
return NULL;
|
|
|
|
/*
|
|
* Start by locating the port node. If no previous endpoint is specified
|
|
* search for the first port node, otherwise get the previous endpoint
|
|
* parent port node.
|
|
*/
|
|
if (!prev) {
|
|
struct device_node *node;
|
|
|
|
node = of_get_child_by_name(parent, "ports");
|
|
if (node)
|
|
parent = node;
|
|
|
|
port = of_get_child_by_name(parent, "port");
|
|
of_node_put(node);
|
|
|
|
if (!port) {
|
|
pr_err("graph: no port node found in %pOF\n", parent);
|
|
return NULL;
|
|
}
|
|
} else {
|
|
port = of_get_parent(prev);
|
|
if (WARN_ONCE(!port, "%s(): endpoint %pOF has no parent node\n",
|
|
__func__, prev))
|
|
return NULL;
|
|
}
|
|
|
|
while (1) {
|
|
/*
|
|
* Now that we have a port node, get the next endpoint by
|
|
* getting the next child. If the previous endpoint is NULL this
|
|
* will return the first child.
|
|
*/
|
|
endpoint = of_get_next_child(port, prev);
|
|
if (endpoint) {
|
|
of_node_put(port);
|
|
return endpoint;
|
|
}
|
|
|
|
/* No more endpoints under this port, try the next one. */
|
|
prev = NULL;
|
|
|
|
do {
|
|
port = of_get_next_child(parent, port);
|
|
if (!port)
|
|
return NULL;
|
|
} while (of_node_cmp(port->name, "port"));
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(of_graph_get_next_endpoint);
|
|
|
|
/**
|
|
* of_graph_get_endpoint_by_regs() - get endpoint node of specific identifiers
|
|
* @parent: pointer to the parent device node
|
|
* @port_reg: identifier (value of reg property) of the parent port node
|
|
* @reg: identifier (value of reg property) of the endpoint node
|
|
*
|
|
* Return: An 'endpoint' node pointer which is identified by reg and at the same
|
|
* is the child of a port node identified by port_reg. reg and port_reg are
|
|
* ignored when they are -1.
|
|
*/
|
|
struct device_node *of_graph_get_endpoint_by_regs(
|
|
const struct device_node *parent, int port_reg, int reg)
|
|
{
|
|
struct of_endpoint endpoint;
|
|
struct device_node *node = NULL;
|
|
|
|
for_each_endpoint_of_node(parent, node) {
|
|
of_graph_parse_endpoint(node, &endpoint);
|
|
if (((port_reg == -1) || (endpoint.port == port_reg)) &&
|
|
((reg == -1) || (endpoint.id == reg)))
|
|
return node;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(of_graph_get_endpoint_by_regs);
|
|
|
|
/**
|
|
* of_graph_get_remote_endpoint() - get remote endpoint node
|
|
* @node: pointer to a local endpoint device_node
|
|
*
|
|
* Return: Remote endpoint node associated with remote endpoint node linked
|
|
* to @node. Use of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_graph_get_remote_endpoint(const struct device_node *node)
|
|
{
|
|
/* Get remote endpoint node. */
|
|
return of_parse_phandle(node, "remote-endpoint", 0);
|
|
}
|
|
EXPORT_SYMBOL(of_graph_get_remote_endpoint);
|
|
|
|
/**
|
|
* of_graph_get_port_parent() - get port's parent node
|
|
* @node: pointer to a local endpoint device_node
|
|
*
|
|
* Return: device node associated with endpoint node linked
|
|
* to @node. Use of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_graph_get_port_parent(struct device_node *node)
|
|
{
|
|
unsigned int depth;
|
|
|
|
if (!node)
|
|
return NULL;
|
|
|
|
/*
|
|
* Preserve usecount for passed in node as of_get_next_parent()
|
|
* will do of_node_put() on it.
|
|
*/
|
|
of_node_get(node);
|
|
|
|
/* Walk 3 levels up only if there is 'ports' node. */
|
|
for (depth = 3; depth && node; depth--) {
|
|
node = of_get_next_parent(node);
|
|
if (depth == 2 && of_node_cmp(node->name, "ports"))
|
|
break;
|
|
}
|
|
return node;
|
|
}
|
|
EXPORT_SYMBOL(of_graph_get_port_parent);
|
|
|
|
/**
|
|
* of_graph_get_remote_port_parent() - get remote port's parent node
|
|
* @node: pointer to a local endpoint device_node
|
|
*
|
|
* Return: Remote device node associated with remote endpoint node linked
|
|
* to @node. Use of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_graph_get_remote_port_parent(
|
|
const struct device_node *node)
|
|
{
|
|
struct device_node *np, *pp;
|
|
|
|
/* Get remote endpoint node. */
|
|
np = of_graph_get_remote_endpoint(node);
|
|
|
|
pp = of_graph_get_port_parent(np);
|
|
|
|
of_node_put(np);
|
|
|
|
return pp;
|
|
}
|
|
EXPORT_SYMBOL(of_graph_get_remote_port_parent);
|
|
|
|
/**
|
|
* of_graph_get_remote_port() - get remote port node
|
|
* @node: pointer to a local endpoint device_node
|
|
*
|
|
* Return: Remote port node associated with remote endpoint node linked
|
|
* to @node. Use of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_graph_get_remote_port(const struct device_node *node)
|
|
{
|
|
struct device_node *np;
|
|
|
|
/* Get remote endpoint node. */
|
|
np = of_graph_get_remote_endpoint(node);
|
|
if (!np)
|
|
return NULL;
|
|
return of_get_next_parent(np);
|
|
}
|
|
EXPORT_SYMBOL(of_graph_get_remote_port);
|
|
|
|
int of_graph_get_endpoint_count(const struct device_node *np)
|
|
{
|
|
struct device_node *endpoint;
|
|
int num = 0;
|
|
|
|
for_each_endpoint_of_node(np, endpoint)
|
|
num++;
|
|
|
|
return num;
|
|
}
|
|
EXPORT_SYMBOL(of_graph_get_endpoint_count);
|
|
|
|
/**
|
|
* of_graph_get_remote_node() - get remote parent device_node for given port/endpoint
|
|
* @node: pointer to parent device_node containing graph port/endpoint
|
|
* @port: identifier (value of reg property) of the parent port node
|
|
* @endpoint: identifier (value of reg property) of the endpoint node
|
|
*
|
|
* Return: Remote device node associated with remote endpoint node linked
|
|
* to @node. Use of_node_put() on it when done.
|
|
*/
|
|
struct device_node *of_graph_get_remote_node(const struct device_node *node,
|
|
u32 port, u32 endpoint)
|
|
{
|
|
struct device_node *endpoint_node, *remote;
|
|
|
|
endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint);
|
|
if (!endpoint_node) {
|
|
pr_debug("no valid endpoint (%d, %d) for node %pOF\n",
|
|
port, endpoint, node);
|
|
return NULL;
|
|
}
|
|
|
|
remote = of_graph_get_remote_port_parent(endpoint_node);
|
|
of_node_put(endpoint_node);
|
|
if (!remote) {
|
|
pr_debug("no valid remote node\n");
|
|
return NULL;
|
|
}
|
|
|
|
if (!of_device_is_available(remote)) {
|
|
pr_debug("not available for remote node\n");
|
|
return NULL;
|
|
}
|
|
|
|
return remote;
|
|
}
|
|
EXPORT_SYMBOL(of_graph_get_remote_node);
|
|
|
|
static struct fwnode_handle *of_fwnode_get(struct fwnode_handle *fwnode)
|
|
{
|
|
return of_fwnode_handle(of_node_get(to_of_node(fwnode)));
|
|
}
|
|
|
|
static void of_fwnode_put(struct fwnode_handle *fwnode)
|
|
{
|
|
of_node_put(to_of_node(fwnode));
|
|
}
|
|
|
|
static bool of_fwnode_device_is_available(const struct fwnode_handle *fwnode)
|
|
{
|
|
return of_device_is_available(to_of_node(fwnode));
|
|
}
|
|
|
|
static bool of_fwnode_property_present(const struct fwnode_handle *fwnode,
|
|
const char *propname)
|
|
{
|
|
return of_property_read_bool(to_of_node(fwnode), propname);
|
|
}
|
|
|
|
static int of_fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
|
|
const char *propname,
|
|
unsigned int elem_size, void *val,
|
|
size_t nval)
|
|
{
|
|
const struct device_node *node = to_of_node(fwnode);
|
|
|
|
if (!val)
|
|
return of_property_count_elems_of_size(node, propname,
|
|
elem_size);
|
|
|
|
switch (elem_size) {
|
|
case sizeof(u8):
|
|
return of_property_read_u8_array(node, propname, val, nval);
|
|
case sizeof(u16):
|
|
return of_property_read_u16_array(node, propname, val, nval);
|
|
case sizeof(u32):
|
|
return of_property_read_u32_array(node, propname, val, nval);
|
|
case sizeof(u64):
|
|
return of_property_read_u64_array(node, propname, val, nval);
|
|
}
|
|
|
|
return -ENXIO;
|
|
}
|
|
|
|
static int
|
|
of_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
|
|
const char *propname, const char **val,
|
|
size_t nval)
|
|
{
|
|
const struct device_node *node = to_of_node(fwnode);
|
|
|
|
return val ?
|
|
of_property_read_string_array(node, propname, val, nval) :
|
|
of_property_count_strings(node, propname);
|
|
}
|
|
|
|
static struct fwnode_handle *
|
|
of_fwnode_get_parent(const struct fwnode_handle *fwnode)
|
|
{
|
|
return of_fwnode_handle(of_get_parent(to_of_node(fwnode)));
|
|
}
|
|
|
|
static struct fwnode_handle *
|
|
of_fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
|
|
struct fwnode_handle *child)
|
|
{
|
|
return of_fwnode_handle(of_get_next_available_child(to_of_node(fwnode),
|
|
to_of_node(child)));
|
|
}
|
|
|
|
static struct fwnode_handle *
|
|
of_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
|
|
const char *childname)
|
|
{
|
|
const struct device_node *node = to_of_node(fwnode);
|
|
struct device_node *child;
|
|
|
|
for_each_available_child_of_node(node, child)
|
|
if (!of_node_cmp(child->name, childname))
|
|
return of_fwnode_handle(child);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
of_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
|
|
const char *prop, const char *nargs_prop,
|
|
unsigned int nargs, unsigned int index,
|
|
struct fwnode_reference_args *args)
|
|
{
|
|
struct of_phandle_args of_args;
|
|
unsigned int i;
|
|
int ret;
|
|
|
|
if (nargs_prop)
|
|
ret = of_parse_phandle_with_args(to_of_node(fwnode), prop,
|
|
nargs_prop, index, &of_args);
|
|
else
|
|
ret = of_parse_phandle_with_fixed_args(to_of_node(fwnode), prop,
|
|
nargs, index, &of_args);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (!args)
|
|
return 0;
|
|
|
|
args->nargs = of_args.args_count;
|
|
args->fwnode = of_fwnode_handle(of_args.np);
|
|
|
|
for (i = 0; i < NR_FWNODE_REFERENCE_ARGS; i++)
|
|
args->args[i] = i < of_args.args_count ? of_args.args[i] : 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct fwnode_handle *
|
|
of_fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
|
|
struct fwnode_handle *prev)
|
|
{
|
|
return of_fwnode_handle(of_graph_get_next_endpoint(to_of_node(fwnode),
|
|
to_of_node(prev)));
|
|
}
|
|
|
|
static struct fwnode_handle *
|
|
of_fwnode_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
|
|
{
|
|
return of_fwnode_handle(
|
|
of_graph_get_remote_endpoint(to_of_node(fwnode)));
|
|
}
|
|
|
|
static struct fwnode_handle *
|
|
of_fwnode_graph_get_port_parent(struct fwnode_handle *fwnode)
|
|
{
|
|
struct device_node *np;
|
|
|
|
/* Get the parent of the port */
|
|
np = of_get_parent(to_of_node(fwnode));
|
|
if (!np)
|
|
return NULL;
|
|
|
|
/* Is this the "ports" node? If not, it's the port parent. */
|
|
if (of_node_cmp(np->name, "ports"))
|
|
return of_fwnode_handle(np);
|
|
|
|
return of_fwnode_handle(of_get_next_parent(np));
|
|
}
|
|
|
|
static int of_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
|
|
struct fwnode_endpoint *endpoint)
|
|
{
|
|
const struct device_node *node = to_of_node(fwnode);
|
|
struct device_node *port_node = of_get_parent(node);
|
|
|
|
endpoint->local_fwnode = fwnode;
|
|
|
|
of_property_read_u32(port_node, "reg", &endpoint->port);
|
|
of_property_read_u32(node, "reg", &endpoint->id);
|
|
|
|
of_node_put(port_node);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const void *
|
|
of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
|
|
const struct device *dev)
|
|
{
|
|
return of_device_get_match_data(dev);
|
|
}
|
|
|
|
const struct fwnode_operations of_fwnode_ops = {
|
|
.get = of_fwnode_get,
|
|
.put = of_fwnode_put,
|
|
.device_is_available = of_fwnode_device_is_available,
|
|
.device_get_match_data = of_fwnode_device_get_match_data,
|
|
.property_present = of_fwnode_property_present,
|
|
.property_read_int_array = of_fwnode_property_read_int_array,
|
|
.property_read_string_array = of_fwnode_property_read_string_array,
|
|
.get_parent = of_fwnode_get_parent,
|
|
.get_next_child_node = of_fwnode_get_next_child_node,
|
|
.get_named_child_node = of_fwnode_get_named_child_node,
|
|
.get_reference_args = of_fwnode_get_reference_args,
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|
.graph_get_next_endpoint = of_fwnode_graph_get_next_endpoint,
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|
.graph_get_remote_endpoint = of_fwnode_graph_get_remote_endpoint,
|
|
.graph_get_port_parent = of_fwnode_graph_get_port_parent,
|
|
.graph_parse_endpoint = of_fwnode_graph_parse_endpoint,
|
|
};
|
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EXPORT_SYMBOL_GPL(of_fwnode_ops);
|