MIPS: ralink: adds clkdev code

/*

 *  This program is free software; you can redistribute it and/or modify it

 *  under the terms of the GNU General Public License version 2 as published

 *  by the Free Software Foundation.

 *

 *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>

 *  Copyright (C) 2013 John Crispin <blogic@openwrt.org>

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/clkdev.h>

#include <linux/clk.h>

#include <asm/time.h>

#include "common.h"

struct clk {

	struct clk_lookup cl;

	unsigned long rate;

};

void ralink_clk_add(const char *dev, unsigned long rate)

{

	struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);

	if (!clk)

		panic("failed to add clock\n");

	clk->cl.dev_id = dev;

	clk->cl.clk = clk;

	clk->rate = rate;

	clkdev_add(&clk->cl);

}

/*

 * Linux clock API

 */

int clk_enable(struct clk *clk)

{

	return 0;

}

EXPORT_SYMBOL_GPL(clk_enable);

void clk_disable(struct clk *clk)

{

}

EXPORT_SYMBOL_GPL(clk_disable);

unsigned long clk_get_rate(struct clk *clk)

{

	return clk->rate;

}

EXPORT_SYMBOL_GPL(clk_get_rate);

void __init plat_time_init(void)

{

	struct clk *clk;

	ralink_of_remap();

	ralink_clk_init();

	clk = clk_get_sys("cpu", NULL);

	if (IS_ERR(clk))

		panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));

	pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);

	mips_hpt_frequency = clk_get_rate(clk) / 2;

	clk_put(clk);

}