83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
104 lines
2.8 KiB
C
104 lines
2.8 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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*/
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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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* free - 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 (*free)(struct clk *clock);
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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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