Merge branches 'ib-mfd-doc-sparc-libdevres-5.5' and 'ib-mfd-power-rtc-5.5' into ibs-for-mfd-merged

Device-Tree bindings for MediaTek PMIC based RTC

MediaTek PMIC based RTC is an independent function of MediaTek PMIC that works

as a type of multi-function device (MFD). The RTC can be configured and set up

with PMIC wrapper bus which is a common resource shared with the other

functions found on the same PMIC.

For MediaTek PMIC MFD bindings, see:

../mfd/mt6397.txt

For MediaTek PMIC wrapper bus bindings, see:

../soc/mediatek/pwrap.txt

Required properties:

- compatible: Should be one of follows

       "mediatek,mt6323-rtc": for MT6323 PMIC

       "mediatek,mt6397-rtc": for MT6397 PMIC

Example:

       pmic {

               compatible = "mediatek,mt6323";

               ...

               rtc {

                       compatible = "mediatek,mt6323-rtc";

               };

       };

F:	drivers/net/dsa/mt7530.*

F:	net/dsa/tag_mtk.c

MEDIATEK BOARD LEVEL SHUTDOWN DRIVERS

M:	Sean Wang <sean.wang@mediatek.com>

L:	linux-pm@vger.kernel.org

S:	Maintained

F:	Documentation/devicetree/bindings/power/reset/mt6323-poweroff.txt

F:	drivers/power/reset/mt6323-poweroff.c

MEDIATEK JPEG DRIVER

M:	Rick Chang <rick.chang@mediatek.com>

M:	Bin Liu <bin.liu@mediatek.com>

	  This driver supports an external powerdown trigger and board power

	  down via the LTC2952. Bindings are made in the device tree.

config POWER_RESET_MT6323

       bool "MediaTek MT6323 power-off driver"

       depends on MFD_MT6397

       help

         The power-off driver is responsible for externally shutdown down

         the power of a remote MediaTek SoC MT6323 is connected to through

         controlling a tiny circuit BBPU inside MT6323 RTC.

         Say Y if you have a board where MT6323 could be found.

config POWER_RESET_QNAP

	bool "QNAP power-off driver"

	depends on OF_GPIO && PLAT_ORION

obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o

obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o

obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o

obj-$(CONFIG_POWER_RESET_MT6323) += mt6323-poweroff.o

obj-$(CONFIG_POWER_RESET_QCOM_PON) += qcom-pon.o

obj-$(CONFIG_POWER_RESET_OCELOT_RESET) += ocelot-reset.o

obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o

// SPDX-License-Identifier: GPL-2.0

/*

 * Power off through MediaTek PMIC

 *

 * Copyright (C) 2018 MediaTek Inc.

 *

 * Author: Sean Wang <sean.wang@mediatek.com>

 *

 */

#include <linux/err.h>

#include <linux/module.h>

#include <linux/of.h>

#include <linux/platform_device.h>

#include <linux/mfd/mt6397/core.h>

#include <linux/mfd/mt6397/rtc.h>

struct mt6323_pwrc {

	struct device *dev;

	struct regmap *regmap;

	u32 base;

};

static struct mt6323_pwrc *mt_pwrc;

static void mt6323_do_pwroff(void)

{

	struct mt6323_pwrc *pwrc = mt_pwrc;

	unsigned int val;

	int ret;

	regmap_write(pwrc->regmap, pwrc->base + RTC_BBPU, RTC_BBPU_KEY);

	regmap_write(pwrc->regmap, pwrc->base + RTC_WRTGR, 1);

	ret = regmap_read_poll_timeout(pwrc->regmap,

					pwrc->base + RTC_BBPU, val,

					!(val & RTC_BBPU_CBUSY),

					MTK_RTC_POLL_DELAY_US,

					MTK_RTC_POLL_TIMEOUT);

	if (ret)

		dev_err(pwrc->dev, "failed to write BBPU: %d\n", ret);

	/* Wait some time until system down, otherwise, notice with a warn */

	mdelay(1000);

	WARN_ONCE(1, "Unable to power off system\n");

}

static int mt6323_pwrc_probe(struct platform_device *pdev)

{

	struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);

	struct mt6323_pwrc *pwrc;

	struct resource *res;

	pwrc = devm_kzalloc(&pdev->dev, sizeof(*pwrc), GFP_KERNEL);

	if (!pwrc)

		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	pwrc->base = res->start;

	pwrc->regmap = mt6397_chip->regmap;

	pwrc->dev = &pdev->dev;

	mt_pwrc = pwrc;

	pm_power_off = &mt6323_do_pwroff;

	return 0;

}

static int mt6323_pwrc_remove(struct platform_device *pdev)

{

	if (pm_power_off == &mt6323_do_pwroff)

		pm_power_off = NULL;

	return 0;

}

static const struct of_device_id mt6323_pwrc_dt_match[] = {

	{ .compatible = "mediatek,mt6323-pwrc" },

	{},

};

MODULE_DEVICE_TABLE(of, mt6323_pwrc_dt_match);

static struct platform_driver mt6323_pwrc_driver = {

	.probe          = mt6323_pwrc_probe,

	.remove         = mt6323_pwrc_remove,

	.driver         = {

		.name   = "mt6323-pwrc",

		.of_match_table = mt6323_pwrc_dt_match,

	},

};

module_platform_driver(mt6323_pwrc_driver);

MODULE_DESCRIPTION("Poweroff driver for MT6323 PMIC");

MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");

MODULE_LICENSE("GPL v2");