u-boot/include/clk.h

/*
 * Copyright (c) 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef _CLK_H_
#define _CLK_H_

int soc_clk_dump(void);

struct clk_ops {
	/**
	 * get_rate() - Get current clock rate
	 *
	 * @dev:	Device to check (UCLASS_CLK)
	 * @return clock rate in Hz, or -ve error code
	 */
	ulong (*get_rate)(struct udevice *dev);

	/**
	 * set_rate() - Set current clock rate
	 *
	 * @dev:	Device to adjust
	 * @rate:	New clock rate in Hz
	 * @return new rate, or -ve error code
	 */
	ulong (*set_rate)(struct udevice *dev, ulong rate);

	/**
	* clk_set_periph_rate() - Set clock rate for a peripheral
	*
	* @dev:	Device to adjust (UCLASS_CLK)
	* @rate:	New clock rate in Hz
	* @return new clock rate in Hz, or -ve error code
	*/
	ulong (*get_periph_rate)(struct udevice *dev, int periph);

	/**
	 * clk_set_periph_rate() - Set current clock rate for a peripheral
	 *
	 * @dev:	Device to update (UCLASS_CLK)
	 * @periph:	Peripheral ID to cupdate
	 * @return new clock rate in Hz, or -ve error code
	 */
	ulong (*set_periph_rate)(struct udevice *dev, int periph, ulong rate);
};

#define clk_get_ops(dev)	((struct clk_ops *)(dev)->driver->ops)

/**
 * clk_get_rate() - Get current clock rate
 *
 * @dev:	Device to check (UCLASS_CLK)
 * @return clock rate in Hz, or -ve error code
 */
ulong clk_get_rate(struct udevice *dev);

/**
 * set_rate() - Set current clock rate
 *
 * @dev:	Device to adjust
 * @rate:	New clock rate in Hz
 * @return new rate, or -ve error code
 */
ulong clk_set_rate(struct udevice *dev, ulong rate);

/**
 * clk_get_periph_rate() - Get current clock rate for a peripheral
 *
 * @dev:	Device to check (UCLASS_CLK)
 * @return clock rate in Hz, -ve error code
 */
ulong clk_get_periph_rate(struct udevice *dev, int periph);

/**
 * clk_set_periph_rate() - Set current clock rate for a peripheral
 *
 * @dev:	Device to update (UCLASS_CLK)
 * @periph:	Peripheral ID to cupdate
 * @return new clock rate in Hz, or -ve error code
 */
ulong clk_set_periph_rate(struct udevice *dev, int periph, ulong rate);

#endif /* _CLK_H_ */