linux-imx

/*

 * Copyright (C) 2014 Philipp Zabel, Pengutronix

 *

 * 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.

 *

 * PWM (mis)used as clock output

 */

#include <linux/clk-provider.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/pwm.h>

​

struct clk_pwm {

    struct clk_hw hw;

    struct pwm_device *pwm;

    u32 fixed_rate;

};

​

static inline struct clk_pwm *to_clk_pwm(struct clk_hw *hw)

{

    return container_of(hw, struct clk_pwm, hw);

}

​

static int clk_pwm_prepare(struct clk_hw *hw)

{

    struct clk_pwm *clk_pwm = to_clk_pwm(hw);

​

    return pwm_enable(clk_pwm->pwm);

}

​

static void clk_pwm_unprepare(struct clk_hw *hw)

{

    struct clk_pwm *clk_pwm = to_clk_pwm(hw);

​

    pwm_disable(clk_pwm->pwm);

}

​

static unsigned long clk_pwm_recalc_rate(struct clk_hw *hw,

                     unsigned long parent_rate)

{

    struct clk_pwm *clk_pwm = to_clk_pwm(hw);

​

    return clk_pwm->fixed_rate;

}

​

static const struct clk_ops clk_pwm_ops = {

    .prepare = clk_pwm_prepare,

    .unprepare = clk_pwm_unprepare,

    .recalc_rate = clk_pwm_recalc_rate,

};

​

static int clk_pwm_probe(struct platform_device *pdev)

{

    struct device_node *node = pdev->dev.of_node;

    struct clk_init_data init;

    struct clk_pwm *clk_pwm;

    struct pwm_device *pwm;

    struct pwm_args pargs;

    const char *clk_name;