Commit d28c74c1 authored by Josef Friedl's avatar Josef Friedl Committed by Lee Jones
Browse files

power: reset: add driver for mt6323 poweroff 



add poweroff driver for mt6323 and make Makefile and Kconfig-Entries

Suggested-by: default avatarFrank Wunderlich <frank-w@public-files.de>
Signed-off-by: default avatarJosef Friedl <josef.friedl@speed.at>
Signed-off-by: default avatarFrank Wunderlich <frank-w@public-files.de>
Acked-by: default avatarSebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: default avatarSean Wang <sean.wang@mediatek.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 47e56812

drivers/power/reset/Kconfig

+10 −0
Original line number Diff line number Diff line
@@ -140,6 +140,16 @@ config POWER_RESET_LTC2952 
	  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

drivers/power/reset/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ obj-$(CONFIG_POWER_RESET_GPIO) += gpio-poweroff.o 
obj-$(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

drivers/power/reset/mt6323-poweroff.c

0 → 100644
+97 −0
Original line number Diff line number Diff line 
// 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");