From: Frank Wunderlich <frank-w@public-files.de> To: linux-mediatek@lists.infradead.org Cc: Frank Wunderlich <frank-w@public-files.de>, devicetree@vger.kernel.org, "linux-arm-kernel @ lists . infradead . org Alessandro Zummo" <a.zummo@towertech.it>, Alexandre Belloni <alexandre.belloni@bootlin.com>, Eddie Huang <eddie.huang@mediatek.com>, Josef Friedl <josef.friedl@speed.at>, Lee Jones <lee.jones@linaro.org>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, linux-rtc@vger.kernel.org, Mark Rutland <mark.rutland@arm.com>, Matthias Brugger <matthias.bgg@gmail.com>, Rob Herring <robh+dt@kernel.org>, Sean Wang <sean.wang@mediatek.com>, Sebastian Reichel <sre@kernel.org>, "Tianping Fang" <tianping.fang@mediatek.com> Subject: [PATCH v6 11/13] power: reset: add driver for mt6323 poweroff Date: Sun, 18 Aug 2019 15:56:09 +0200 Message-ID: <20190818135611.7776-12-frank-w@public-files.de> (raw) In-Reply-To: <20190818135611.7776-1-frank-w@public-files.de> 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
next prev parent reply index Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-08-18 13:55 [PATCH v6 00/13] implement poweroff for mt6323 / bpi-r2 Frank Wunderlich 2019-08-18 13:55 ` [PATCH v6 01/13] dt-bindings: mfd: mediatek: mt6397: change to relative paths Frank Wunderlich 2019-08-27 16:33 ` Rob Herring 2019-09-02 9:43 ` Lee Jones 2019-08-18 13:56 ` [PATCH v6 02/13] dt-bindings: mfd: mediatek: update rtc to include mt6323 Frank Wunderlich 2019-08-27 16:46 ` Rob Herring 2019-09-02 9:44 ` Lee Jones 2019-08-18 13:56 ` [PATCH v6 03/13] dt-bindings: mfd: mediatek: add mt6323 power-controller Frank Wunderlich 2019-08-27 16:46 ` Rob Herring 2019-09-02 9:44 ` Lee Jones 2019-08-18 13:56 ` [PATCH v6 04/13] dt-bindings: rtc: mediatek: add missing mt6397 rtc Frank Wunderlich 2019-08-27 16:47 ` Rob Herring 2019-08-18 13:56 ` [PATCH v6 05/13] rtc: mt6397: move some common definitions into rtc.h Frank Wunderlich 2019-08-20 19:48 ` Alexandre Belloni 2019-09-02 9:47 ` Lee Jones 2019-08-18 13:56 ` [PATCH v6 06/13] mfd: mt6397: add mutex include Frank Wunderlich 2019-09-02 9:49 ` Lee Jones 2019-08-18 13:56 ` [PATCH v6 07/13] rtc: mt6397: improvements of rtc driver Frank Wunderlich 2019-08-20 19:49 ` Alexandre Belloni 2019-08-18 13:56 ` [PATCH v6 08/13] mfd: mt6323: some improvements of mt6397-core Frank Wunderlich 2019-09-02 9:49 ` Lee Jones 2019-08-18 13:56 ` [PATCH v6 09/13] rtc: mt6397: add compatible for mt6323 Frank Wunderlich 2019-08-20 19:49 ` Alexandre Belloni 2019-08-18 13:56 ` [PATCH v6 10/13] mfd: mt6323: add mt6323 rtc+pwrc Frank Wunderlich 2019-09-02 9:50 ` Lee Jones 2019-08-18 13:56 ` Frank Wunderlich [this message] 2019-09-01 20:11 ` [PATCH v6 11/13] power: reset: add driver for mt6323 poweroff Sebastian Reichel 2019-08-18 13:56 ` [PATCH v6 12/13] MAINTAINERS: add Mediatek shutdown drivers Frank Wunderlich 2019-09-01 20:12 ` Sebastian Reichel 2019-08-18 13:56 ` [PATCH v6 13/13] arm: dts: mt6323: add keys, power-controller, rtc and codec Frank Wunderlich 2019-08-18 14:30 ` [PATCH v6 00/13] implement poweroff for mt6323 / bpi-r2 Frank Wunderlich 2019-09-06 13:06 ` Frank Wunderlich
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