276d446757
When freeing a clock there is not much we can do if there is an error, and most callers do not actually check the return value. Even e.g. checking to make sure that clk->id is valid should have been done in request() in the first place (unless someone is messing with the driver behind our back). Just return void and don't bother returning an error. Signed-off-by: Sean Anderson <seanga2@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org> Link: https://lore.kernel.org/r/20220115222504.617013-2-seanga2@gmail.com
141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*/
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#ifndef _CLK_UCLASS_H
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#define _CLK_UCLASS_H
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/* See clk.h for background documentation. */
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#include <clk.h>
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struct ofnode_phandle_args;
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/**
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* struct clk_ops - The functions that a clock driver must implement.
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* @of_xlate: Translate a client's device-tree (OF) clock specifier.
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* @request: Request a translated clock.
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* @rfree: Free a previously requested clock.
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* @round_rate: Adjust a rate to the exact rate a clock can provide.
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* @get_rate: Get current clock rate.
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* @set_rate: Set current clock rate.
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* @set_parent: Set current clock parent
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* @enable: Enable a clock.
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* @disable: Disable a clock.
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*
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* The individual methods are described more fully below.
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*/
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struct clk_ops {
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int (*of_xlate)(struct clk *clock,
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struct ofnode_phandle_args *args);
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int (*request)(struct clk *clock);
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void (*rfree)(struct clk *clock);
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ulong (*round_rate)(struct clk *clk, ulong rate);
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ulong (*get_rate)(struct clk *clk);
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ulong (*set_rate)(struct clk *clk, ulong rate);
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int (*set_parent)(struct clk *clk, struct clk *parent);
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int (*enable)(struct clk *clk);
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int (*disable)(struct clk *clk);
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};
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#if 0 /* For documentation only */
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/**
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* of_xlate() - Translate a client's device-tree (OF) clock specifier.
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* @clock: The clock struct to hold the translation result.
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* @args: The clock specifier values from device tree.
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*
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* The clock core calls this function as the first step in implementing
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* a client's clk_get_by_*() call.
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*
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* If this function pointer is set to NULL, the clock core will use a
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* default implementation, which assumes #clock-cells = <1>, and that
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* the DT cell contains a simple integer clock ID.
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*
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* At present, the clock API solely supports device-tree. If this
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* changes, other xxx_xlate() functions may be added to support those
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* other mechanisms.
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*
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* Return: 0 if OK, or a negative error code.
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*/
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int of_xlate(struct clk *clock, struct ofnode_phandle_args *args);
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/**
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* request() - Request a translated clock.
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* @clock: The clock struct to request; this has been fille in by
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* a previoux xxx_xlate() function call, or by the caller
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* of clk_request().
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*
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* The clock core calls this function as the second step in
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* implementing a client's clk_get_by_*() call, following a successful
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* xxx_xlate() call, or as the only step in implementing a client's
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* clk_request() call.
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*
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* Return: 0 if OK, or a negative error code.
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*/
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int request(struct clk *clock);
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/**
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* rfree() - Free a previously requested clock.
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* @clock: The clock to free.
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*
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* Free any resources allocated in request().
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*/
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void rfree(struct clk *clock);
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/**
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* round_rate() - Adjust a rate to the exact rate a clock can provide.
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* @clk: The clock to manipulate.
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* @rate: Desidered clock rate in Hz.
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*
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* Return: rounded rate in Hz, or -ve error code.
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*/
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ulong round_rate(struct clk *clk, ulong rate);
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/**
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* get_rate() - Get current clock rate.
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* @clk: The clock to query.
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*
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* Return: clock rate in Hz, or -ve error code
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*/
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ulong get_rate(struct clk *clk);
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/**
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* set_rate() - Set current clock rate.
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* @clk: The clock to manipulate.
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* @rate: New clock rate in Hz.
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*
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* Return: new rate, or -ve error code.
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*/
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ulong set_rate(struct clk *clk, ulong rate);
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/**
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* set_parent() - Set current clock parent
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* @clk: The clock to manipulate.
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* @parent: New clock parent.
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*
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* Return: zero on success, or -ve error code.
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*/
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int set_parent(struct clk *clk, struct clk *parent);
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/**
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* enable() - Enable a clock.
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* @clk: The clock to manipulate.
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*
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* Return: zero on success, or -ve error code.
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*/
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int enable(struct clk *clk);
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/**
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* disable() - Disable a clock.
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* @clk: The clock to manipulate.
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*
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* Return: zero on success, or -ve error code.
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*/
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int disable(struct clk *clk);
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#endif
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#endif
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