linux-imx

/*

 * MFD core driver for Rockchip RK808/RK818

 *

 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd

 *

 * Author: Chris Zhong <zyw@rock-chips.com>

 * Author: Zhang Qing <zhangqing@rock-chips.com>

 *

 * Copyright (C) 2016 PHYTEC Messtechnik GmbH

 *

 * Author: Wadim Egorov <w.egorov@phytec.de>

 *

 * 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.

 */

​

#include <linux/i2c.h>

#include <linux/interrupt.h>

#include <linux/mfd/rk808.h>

#include <linux/mfd/core.h>

#include <linux/module.h>

#include <linux/of_device.h>

#include <linux/regmap.h>

​

struct rk808_reg_data {

    int addr;

    int mask;

    int value;

};

​

static bool rk808_is_volatile_reg(struct device *dev, unsigned int reg)

{

    /*

     * Notes:

     * - Technically the ROUND_30s bit makes RTC_CTRL_REG volatile, but

     *   we don't use that feature.  It's better to cache.

     * - It's unlikely we care that RK808_DEVCTRL_REG is volatile since

     *   bits are cleared in case when we shutoff anyway, but better safe.

     */

​

    switch (reg) {

    case RK808_SECONDS_REG ... RK808_WEEKS_REG:

    case RK808_RTC_STATUS_REG:

    case RK808_VB_MON_REG:

    case RK808_THERMAL_REG:

    case RK808_DCDC_UV_STS_REG:

    case RK808_LDO_UV_STS_REG:

    case RK808_DCDC_PG_REG:

    case RK808_LDO_PG_REG:

    case RK808_DEVCTRL_REG:

    case RK808_INT_STS_REG1:

    case RK808_INT_STS_REG2:

        return true;

    }

​

    return false;

}

​

static const struct regmap_config rk818_regmap_config = {

    .reg_bits = 8,

    .val_bits = 8,

    .max_register = RK818_USB_CTRL_REG,

    .cache_type = REGCACHE_RBTREE,

    .volatile_reg = rk808_is_volatile_reg,

};

​

static const struct regmap_config rk805_regmap_config = {

    .reg_bits = 8,

    .val_bits = 8,

    .max_register = RK805_OFF_SOURCE_REG,

    .cache_type = REGCACHE_RBTREE,

    .volatile_reg = rk808_is_volatile_reg,

};

​

static const struct regmap_config rk808_regmap_config = {

    .reg_bits = 8,

    .val_bits = 8,

    .max_register = RK808_IO_POL_REG,

    .cache_type = REGCACHE_RBTREE,

    .volatile_reg = rk808_is_volatile_reg,

};

​

static struct resource rtc_resources[] = {

    {

        .start  = RK808_IRQ_RTC_ALARM,

        .end    = RK808_IRQ_RTC_ALARM,