linux-imx

/*

 * Generic Exynos Bus frequency driver with DEVFREQ Framework

 *

 * Copyright (c) 2016 Samsung Electronics Co., Ltd.

 * Author : Chanwoo Choi <cw00.choi@samsung.com>

 *

 * This driver support Exynos Bus frequency feature by using

 * DEVFREQ framework and is based on drivers/devfreq/exynos/exynos4_bus.c.

 *

 * 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.

 */

​

#include <linux/clk.h>

#include <linux/devfreq.h>

#include <linux/devfreq-event.h>

#include <linux/device.h>

#include <linux/export.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/pm_opp.h>

#include <linux/platform_device.h>

#include <linux/regulator/consumer.h>

#include <linux/slab.h>

​

#define DEFAULT_SATURATION_RATIO    40

#define DEFAULT_VOLTAGE_TOLERANCE   2

​

struct exynos_bus {

    struct device *dev;

​

    struct devfreq *devfreq;

    struct devfreq_event_dev **edev;

    unsigned int edev_count;

    struct mutex lock;

​

    unsigned long curr_freq;

​

    struct regulator *regulator;

    struct clk *clk;

    unsigned int voltage_tolerance;

    unsigned int ratio;

};

​

/*

 * Control the devfreq-event device to get the current state of bus

 */

#define exynos_bus_ops_edev(ops)                \

static int exynos_bus_##ops(struct exynos_bus *bus)     \

{                               \

    int i, ret;                     \

                                \

    for (i = 0; i < bus->edev_count; i++) {         \

        if (!bus->edev[i])              \

            continue;               \

        ret = devfreq_event_##ops(bus->edev[i]);    \

        if (ret < 0)                    \

            return ret;             \

    }                           \

                                \

    return 0;                       \

}