amlogic-aml8726-mx-kernel/arch/arm/mach-mxs/include/mach/clock.h

/*
 * Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA  02110-1301, USA.
 */

#ifndef __MACH_MXS_CLOCK_H__
#define __MACH_MXS_CLOCK_H__

#ifndef __ASSEMBLY__
#include <linux/list.h>

struct module;

struct clk {
	int id;
	/* Source clock this clk depends on */
	struct clk *parent;
	/* Reference count of clock enable/disable */
	__s8 usecount;
	/* Register bit position for clock's enable/disable control. */
	u8 enable_shift;
	/* Register address for clock's enable/disable control. */
	void __iomem *enable_reg;
	u32 flags;
	/* get the current clock rate (always a fresh value) */
	unsigned long (*get_rate) (struct clk *);
	/* Function ptr to set the clock to a new rate. The rate must match a
	   supported rate returned from round_rate. Leave blank if clock is not
	   programmable */
	int (*set_rate) (struct clk *, unsigned long);
	/* Function ptr to round the requested clock rate to the nearest
	   supported rate that is less than or equal to the requested rate. */
	unsigned long (*round_rate) (struct clk *, unsigned long);
	/* Function ptr to enable the clock. Leave blank if clock can not
	   be gated. */
	int (*enable) (struct clk *);
	/* Function ptr to disable the clock. Leave blank if clock can not
	   be gated. */
	void (*disable) (struct clk *);
	/* Function ptr to set the parent clock of the clock. */
	int (*set_parent) (struct clk *, struct clk *);
};

int clk_register(struct clk *clk);
void clk_unregister(struct clk *clk);

#endif /* __ASSEMBLY__ */
#endif /* __MACH_MXS_CLOCK_H__ */