2983ad55a1
It returns the rate which will be set if you ask clk_set_rate() to set that rate. It provides a way to query exactly what rate you'll get if you call clk_set_rate() with that same argument. So essentially, clk_round_rate() and clk_set_rate() are equivalent except the former does not modify the clock hardware in any way. Signed-off-by: Dario Binacchi <dariobin@libero.it> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Sean Anderson <seanga2@gmail.com>
112 lines
3.1 KiB
C
112 lines
3.1 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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*/
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struct clk_ops {
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/**
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* of_xlate - Translate a client's device-tree (OF) clock specifier.
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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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* @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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* @return 0 if OK, or a negative error code.
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*/
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int (*of_xlate)(struct clk *clock,
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struct ofnode_phandle_args *args);
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/**
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* request - Request a translated clock.
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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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* @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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* @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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*
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* This is the implementation of the client clk_free() API.
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*
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* @clock: The clock to free.
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* @return 0 if OK, or a negative error code.
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*/
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int (*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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*
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* @clk: The clock to manipulate.
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* @rate: Desidered clock rate in Hz.
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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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*
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* @clk: The clock to query.
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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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*
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* @clk: The clock to manipulate.
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* @rate: New clock rate in Hz.
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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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*
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* @clk: The clock to manipulate.
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* @parent: New clock parent.
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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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*
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* @clk: The clock to manipulate.
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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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*
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* @clk: The clock to manipulate.
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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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};
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#endif
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