linux-imx

/*

 * System Control and Power Interface (SCPI) Protocol based clock driver

 *

 * Copyright (C) 2015 ARM Ltd.

 *

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

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope 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, see <http://www.gnu.org/licenses/>.

 */

​

#include <linux/clk-provider.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/of.h>

#include <linux/module.h>

#include <linux/of_platform.h>

#include <linux/platform_device.h>

#include <linux/scpi_protocol.h>

​

struct scpi_clk {

    u32 id;

    struct clk_hw hw;

    struct scpi_dvfs_info *info;

    struct scpi_ops *scpi_ops;

};

​

#define to_scpi_clk(clk) container_of(clk, struct scpi_clk, hw)

​

static struct platform_device *cpufreq_dev;

​

static unsigned long scpi_clk_recalc_rate(struct clk_hw *hw,

                      unsigned long parent_rate)

{

    struct scpi_clk *clk = to_scpi_clk(hw);

​

    return clk->scpi_ops->clk_get_val(clk->id);

}

​

static long scpi_clk_round_rate(struct clk_hw *hw, unsigned long rate,

                unsigned long *parent_rate)

{

    /*

     * We can't figure out what rate it will be, so just return the

     * rate back to the caller. scpi_clk_recalc_rate() will be called

     * after the rate is set and we'll know what rate the clock is

     * running at then.

     */

    return rate;

}

​

static int scpi_clk_set_rate(struct clk_hw *hw, unsigned long rate,

                 unsigned long parent_rate)

{

    struct scpi_clk *clk = to_scpi_clk(hw);

​