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    Subject[PATCH v6 11/13] power: reset: add driver for mt6323 poweroff
    Date
    From: Josef Friedl <josef.friedl@speed.at>

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

    Suggested-by: Frank Wunderlich <frank-w@public-files.de>
    Signed-off-by: Josef Friedl <josef.friedl@speed.at>
    Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
    ---
    changes since v5: split out mfd/mt6397/core.h
    changes since v4: none
    changes since v3: none
    changes since v2: none (=v2 part 5)
    ---
    drivers/power/reset/Kconfig | 10 +++
    drivers/power/reset/Makefile | 1 +
    drivers/power/reset/mt6323-poweroff.c | 97 +++++++++++++++++++++++++++
    3 files changed, 108 insertions(+)
    create mode 100644 drivers/power/reset/mt6323-poweroff.c

    diff --git a/drivers/power/reset/Kconfig b/drivers/power/reset/Kconfig
    index a564237278ff..c721939767eb 100644
    --- a/drivers/power/reset/Kconfig
    +++ b/drivers/power/reset/Kconfig
    @@ -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
    diff --git a/drivers/power/reset/Makefile b/drivers/power/reset/Makefile
    index 85da3198e4e0..da37f8b851dc 100644
    --- a/drivers/power/reset/Makefile
    +++ b/drivers/power/reset/Makefile
    @@ -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
    diff --git a/drivers/power/reset/mt6323-poweroff.c b/drivers/power/reset/mt6323-poweroff.c
    new file mode 100644
    index 000000000000..1caf43d9e46d
    --- /dev/null
    +++ b/drivers/power/reset/mt6323-poweroff.c
    @@ -0,0 +1,97 @@
    +// 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");
    --
    2.17.1
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