added patch for RTC and poweroff

Documentation/devicetree/bindings/mfd/mt6397.txt

@@ -21,8 +21,10 @@ compatible: "mediatek,mt6397" or "mediatek,mt6323"
 Optional subnodes:
 
 - rtc
-	Required properties:
+	Required properties: Should be one of follows
+		- compatible: "mediatek,mt6323-rtc"
 		- compatible: "mediatek,mt6397-rtc"
+	For details, see Documentation/devicetree/bindings/rtc/rtc-mt6397.txt
 - regulators
 	Required properties:
 		- compatible: "mediatek,mt6397-regulator"

Documentation/devicetree/bindings/power/reset/mt6397-rtc-poweroff.txt

@@ -0,0 +1,24 @@
+Device-Tree bindings for Power Device on MediaTek PMIC RTC
+
+The power device is responsible for externally power off or on the remote
+MediaTek SoC through the a tiny circuit block BBPU inside PMIC RTC.
+
+Required parent node:
+- rtc
+	For MediaTek PMIC RTC bindings, see:
+	Documentation/devicetree/bindings/mfd/mt6397.txt
+
+Required properties:
+- compatible: Should be one of follows
+	"mediatek,mt6323-rtc-poweroff": for MT6323 PMIC
+	"mediatek,mt6397-rtc-poweroff": for MT6397 PMIC
+
+Example:
+
+	rtc {
+		compatible = "mediatek,mt6323-rtc";
+
+		power-off {
+			compatible = "mediatek,mt6323-rtc-poweroff";
+		};
+	};

Documentation/devicetree/bindings/rtc/rtc-mt6397.txt

@@ -0,0 +1,39 @@
+Device-Tree bindings for MediaTek PMIC based RTC
+
+MediaTek PMIC based RTC is an independent function of MediaTek PMIC which
+is working as a multi-function device (MFD). And the RTC can be configured and
+set up via PMIC wrapper bus. Which is also common resource shared among the
+other functions present on the PMIC.
+
+For MediaTek PMIC wrapper bus bindings, see:
+Documentation/devicetree/bindings/soc/mediatek/pwrap.txt
+
+Required parent node:
+- pmic
+  For MediaTek PMIC MFD bindings, see:
+  Documentation/devicetree/bindings/mfd/mt6397.txt
+
+Required properties:
+- compatible: Should be one of follows
+	"mediatek,mt6323-rtc": for MT6323 PMIC
+	"mediatek,mt6397-rtc": for MT6397 PMIC
+
+Optional child node:
+- power-off
+  For Power-Off Device for MediaTek PMIC RTC bindings, see:
+  Documentation/devicetree/bindings/power/reset/mt6397-rtc-poweroff.txt
+
+Example:
+
+	pmic {
+		compatible = "mediatek,mt6323";
+
+		...
+		rtc {
+			compatible = "mediatek,mt6323-rtc";
+
+			power-off {
+				compatible = "mediatek,mt6323-rtc-poweroff";
+			};
+		};
+};

arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts

@@ -760,7 +760,15 @@
 			};
 		};
 
+		mt6323rtc: rtc {
+			compatible = "mediatek,mt6323-rtc";
+
+			power-off {
+				compatible = "mediatek,mt6323-rtc-poweroff";
+			};
+		};
 	};
+
 };
 
 &consys {       

arch/arm/configs/mt7623n_evb_fwu_defconfig

@@ -532,3 +532,6 @@ CONFIG_NFS_COMMON=y
 #xfs
 CONFIG_XFS_FS=m
 
+#RTC/POWER
+CONFIG_POWER_RESET=y
+CONFIG_POWER_RESET_MT6397_RTC=y

drivers/mfd/mt6397-core.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2014 MediaTek Inc.
+ * Copyright (c) 2014-2018 MediaTek Inc.
  * Author: Flora Fu, MediaTek
  *
  * This program is free software; you can redistribute it and/or modify
@@ -23,13 +23,29 @@
 #include <linux/mfd/mt6397/registers.h>
 #include <linux/mfd/mt6323/registers.h>
 
+#define MT6323_RTC_BASE		0x8000
+#define MT6323_RTC_SIZE		0x3e
+
 #define MT6397_RTC_BASE		0xe000
 #define MT6397_RTC_SIZE		0x3e
 
 #define MT6323_CID_CODE		0x23
 #define MT6391_CID_CODE		0x91
 #define MT6397_CID_CODE		0x97
 
+static const struct resource mt6323_rtc_resources[] = {
+	{
+		.start = MT6323_RTC_BASE,
+		.end   = MT6323_RTC_BASE + MT6323_RTC_SIZE,
+		.flags = IORESOURCE_MEM,
+	},
+	{
+		.start = MT6323_IRQ_STATUS_RTC,
+		.end   = MT6323_IRQ_STATUS_RTC,
+		.flags = IORESOURCE_IRQ,
+	},
+};
+
 static const struct resource mt6397_rtc_resources[] = {
 	{
 		.start = MT6397_RTC_BASE,
@@ -45,6 +61,11 @@ static const struct resource mt6397_rtc_resources[] = {
 
 static const struct mfd_cell mt6323_devs[] = {
 	{
+		.name = "mt6323-rtc",
+		.num_resources = ARRAY_SIZE(mt6323_rtc_resources),
+		.resources = mt6323_rtc_resources,
+		.of_compatible = "mediatek,mt6323-rtc",
+	}, {
 		.name = "mt6323-regulator",
 		.of_compatible = "mediatek,mt6323-regulator"
 	}, {
@@ -289,7 +310,7 @@ static int mt6397_probe(struct platform_device *pdev)
 
 		ret = devm_mfd_add_devices(&pdev->dev, -1, mt6323_devs,
 					   ARRAY_SIZE(mt6323_devs), NULL,
-					   0, NULL);
+					   0, pmic->irq_domain);
 		break;
 
 	case MT6397_CID_CODE:
@@ -304,7 +325,7 @@ static int mt6397_probe(struct platform_device *pdev)
 
 		ret = devm_mfd_add_devices(&pdev->dev, -1, mt6397_devs,
 					   ARRAY_SIZE(mt6397_devs), NULL,
-					   0, NULL);
+					   0, pmic->irq_domain);
 		break;
 
 	default:

drivers/power/reset/Kconfig

@@ -130,6 +130,15 @@ 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_MT6397_RTC
+	bool "MediaTek MT6397 RTC power-off driver"
+	help
+	  This driver supports turning off a remote MediaTek SoC by
+	  controlling BBPU on MT6397 or MT6323 RTC.
+
+	  Select this if you're building a kernel with your MediaTek SoC
+	  with an equipment with MT6397 or MT6323 PMIC.
+
 config POWER_RESET_QNAP
 	bool "QNAP power-off driver"
 	depends on OF_GPIO && PLAT_ORION

drivers/power/reset/Makefile

@@ -12,6 +12,7 @@ obj-$(CONFIG_POWER_RESET_GPIO_RESTART) += gpio-restart.o
 obj-$(CONFIG_POWER_RESET_HISI) += hisi-reboot.o
 obj-$(CONFIG_POWER_RESET_IMX) += imx-snvs-poweroff.o
 obj-$(CONFIG_POWER_RESET_MSM) += msm-poweroff.o
+obj-$(CONFIG_POWER_RESET_MT6397_RTC) += mt6397-rtc-poweroff.o
 obj-$(CONFIG_POWER_RESET_PIIX4_POWEROFF) += piix4-poweroff.o
 obj-$(CONFIG_POWER_RESET_LTC2952) += ltc2952-poweroff.o
 obj-$(CONFIG_POWER_RESET_QNAP) += qnap-poweroff.o

drivers/power/reset/mt6397-rtc-poweroff.c

@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Power-off using MediaTek PMIC RTC device
+ *
+ * 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/rtc/mt6397.h>
+
+struct mt6397_rtc_powercon {
+	struct device *dev;
+	struct mt6397_rtc *rtc;
+};
+
+static struct mt6397_rtc_powercon *mt_powercon;
+
+static void mt6397_rtc_do_poweroff(void)
+{
+	struct mt6397_rtc_powercon *powercon = mt_powercon;
+	struct mt6397_rtc *rtc = powercon->rtc;
+	unsigned int val;
+	int ret;
+
+	regmap_write(rtc->regmap, rtc->addr_base + RTC_BBPU, RTC_BBPU_KEY);
+	regmap_write(rtc->regmap, rtc->addr_base + RTC_WRTGR, 1);
+
+	ret = regmap_read_poll_timeout(rtc->regmap,
+				       rtc->addr_base + RTC_BBPU, val,
+				       !(val & RTC_BBPU_CBUSY),
+				       MTK_RTC_POLL_DELAY_US,
+				       MTK_RTC_POLL_TIMEOUT);
+	if (ret)
+		dev_err(powercon->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 poweroff system\n");
+}
+
+static int mt6397_rtc_poweroff_probe(struct platform_device *pdev)
+{
+	struct mt6397_rtc *rtc = dev_get_drvdata(pdev->dev.parent);
+	struct mt6397_rtc_powercon *powercon;
+
+	if (!rtc) {
+		dev_err(&pdev->dev, "Can't find RTC as the parent\n");
+		return -ENODEV;
+	}
+
+	powercon = devm_kzalloc(&pdev->dev, sizeof(*powercon), GFP_KERNEL);
+	if (!powercon)
+		return -ENOMEM;
+
+	powercon->dev = &pdev->dev;
+	powercon->rtc = rtc;
+	mt_powercon = powercon;
+
+	pm_power_off = &mt6397_rtc_do_poweroff;
+
+	return 0;
+}
+
+static int mt6397_rtc_poweroff_remove(struct platform_device *pdev)
+{
+	if (pm_power_off == &mt6397_rtc_do_poweroff)
+		pm_power_off = NULL;
+
+	return 0;
+}
+
+static const struct of_device_id mt6397_rtc_poweroff_dt_match[] = {
+	{ .compatible = "mediatek,mt6323-rtc-poweroff" },
+	{ .compatible = "mediatek,mt6397-rtc-poweroff" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mt6397_rtc_poweroff_dt_match);
+
+static struct platform_driver mt6397_rtc_poweroff_driver = {
+	.probe		= mt6397_rtc_poweroff_probe,
+	.remove		= mt6397_rtc_poweroff_remove,
+	.driver		= {
+		.name	= "mt6397-rtc-poweroff",
+		.of_match_table = mt6397_rtc_poweroff_dt_match,
+	},
+};
+
+module_platform_driver(mt6397_rtc_poweroff_driver);
+
+MODULE_DESCRIPTION("Poweroff driver using MediaTek PMIC RTC");
+MODULE_AUTHOR("Sean Wang <sean.wang@mediatek.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:mt6397-rtc-poweroff");