[PATCH v3 0/4] rtc: mediatek: add support for SoC based RTC on MT7622

[PATCH v3 0/4] rtc: mediatek: add support for SoC based RTC on MT7622

[sean.wang-NuS5LvNUpcJWk0Htik3J/w]

From: Sean Wang <sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>

Changes since v2:
- Remove time extension with yr_base 
- Add fixup that ensures all time fields in hardware keeping consistency
inside the mtk_rtc_get_alarm_or_time call
- Add validity for time range should be between 2001 to 2099
- Enhance comments with aligned style and explanation for certain limiation in
hardware
- Rename dt-binding naming from rtc-mediatek.txt to rtc-mt7622.txt
- Rename config naming from RTC_DRV_MEDIATEK to RTC_DRV_MT7622

Changes since v1:
- Rename to rtc-mt7622.c from rtc-mediatek.c
- Use [readl,writel]_relaxed instead of __raw_* version
- Remove redundant register reading in mtk_rtc_get_alarm_or_time()
- Stop alarm when alarm is really expired in mtk_rtc_alarmirq()
- Extend the maximum year the RTC/Alarm can count/support using year rebasing
- Remove unnesscary log which is already done in core layer

This patchset introduces support for MediaTek SoC based real time clock
(RTC) Currently, the driver is already tested successfully with hwclock
and wakealarm on MT7622 SoC. And it should also be workable on other
similar MediaTek SoCs. And patch 3 is a distinct patch used to distinguish
between either SoC based or PMIC based RTC to avoid confusion for the RTC
selection for the target SoC.

Sean Wang (4):
  dt-bindings: rtc: mediatek: add bindings for MediaTek SoC based RTC
  rtc: mediatek: add driver for RTC on MT7622 SoC
  rtc: mediatek: enhance the description for MediaTek PMIC based RTC
  rtc: mediatek: update MAINTAINERS entry with MediaTek RTC driver

 .../devicetree/bindings/rtc/rtc-mt7622.txt         |  21 +
 MAINTAINERS                                        |   3 +
 drivers/rtc/Kconfig                                |  18 +-
 drivers/rtc/Makefile                               |   1 +
 drivers/rtc/rtc-mt7622.c                           | 422 +++++++++++++++++++++
 5 files changed, 461 insertions(+), 4 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/rtc/rtc-mt7622.txt
 create mode 100644 drivers/rtc/rtc-mt7622.c

-- 
2.7.4

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[PATCH v3 1/4] dt-bindings: rtc: mediatek: add bindings for MediaTek SoC based RTC

[sean.wang]

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

Add device-tree binding for MediaTek SoC based RTC

Cc: devicetree@vger.kernel.org
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Acked-by: Rob Herring <robh@kernel.org>
---
 .../devicetree/bindings/rtc/rtc-mt7622.txt          | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/rtc-mt7622.txt

diff --git a/Documentation/devicetree/bindings/rtc/rtc-mt7622.txt b/Documentation/devicetree/bindings/rtc/rtc-mt7622.txt
new file mode 100644
index 0000000..09fe8f5
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/rtc-mt7622.txt
@@ -0,0 +1,21 @@
+Device-Tree bindings for MediaTek SoC based RTC
+
+Required properties:
+- compatible	    : Should be
+			"mediatek,mt7622-rtc", "mediatek,soc-rtc" : for MT7622 SoC
+- reg 		    : Specifies base physical address and size of the registers;
+- interrupts	    : Should contain the interrupt for RTC alarm;
+- clocks	    : Specifies list of clock specifiers, corresponding to
+		      entries in clock-names property;
+- clock-names	    : Should contain "rtc" entries
+
+Example:
+
+rtc: rtc@10212800 {
+	compatible = "mediatek,mt7622-rtc",
+		     "mediatek,soc-rtc";
+	reg = <0 0x10212800 0 0x200>;
+	interrupts = <GIC_SPI 129 IRQ_TYPE_LEVEL_LOW>;
+	clocks = <&topckgen CLK_TOP_RTC>;
+	clock-names = "rtc";
+};
-- 
2.7.4

[PATCH v3 2/4] rtc: mediatek: add driver for RTC on MT7622 SoC

[sean.wang-NuS5LvNUpcJWk0Htik3J/w]

From: Sean Wang <sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>

This patch introduces the driver for the RTC on MT7622 SoC.

Signed-off-by: Sean Wang <sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
---
 drivers/rtc/Kconfig      |  10 ++
 drivers/rtc/Makefile     |   1 +
 drivers/rtc/rtc-mt7622.c | 422 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 433 insertions(+)
 create mode 100644 drivers/rtc/rtc-mt7622.c

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index e0e58f3..fd9b590 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1705,6 +1705,16 @@ config RTC_DRV_MOXART
 	   This driver can also be built as a module. If so, the module
 	   will be called rtc-moxart
 
+config RTC_DRV_MT7622
+	tristate "MediaTek SoC based RTC"
+	depends on ARCH_MEDIATEK || COMPILE_TEST
+	help
+	  This enables support for the real time clock built in the MediaTek
+	  SoCs.
+
+	  This drive can also be built as a module. If so, the module
+	  will be called rtc-mt7622.
+
 config RTC_DRV_MT6397
 	tristate "Mediatek Real Time Clock driver"
 	depends on MFD_MT6397 || (COMPILE_TEST && IRQ_DOMAIN)
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 7230014..eb47f8c 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -101,6 +101,7 @@ obj-$(CONFIG_RTC_DRV_MOXART)	+= rtc-moxart.o
 obj-$(CONFIG_RTC_DRV_MPC5121)	+= rtc-mpc5121.o
 obj-$(CONFIG_RTC_DRV_VRTC)	+= rtc-mrst.o
 obj-$(CONFIG_RTC_DRV_MSM6242)	+= rtc-msm6242.o
+obj-$(CONFIG_RTC_DRV_MT7622)	+= rtc-mt7622.o
 obj-$(CONFIG_RTC_DRV_MT6397)	+= rtc-mt6397.o
 obj-$(CONFIG_RTC_DRV_MV)	+= rtc-mv.o
 obj-$(CONFIG_RTC_DRV_MXC)	+= rtc-mxc.o
diff --git a/drivers/rtc/rtc-mt7622.c b/drivers/rtc/rtc-mt7622.c
new file mode 100644
index 0000000..d79b9ae
--- /dev/null
+++ b/drivers/rtc/rtc-mt7622.c
@@ -0,0 +1,422 @@
+/*
+ * Driver for MediaTek SoC based RTC
+ *
+ * Copyright (C) 2017 Sean Wang <sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+
+#define MTK_RTC_DEV KBUILD_MODNAME
+
+#define MTK_RTC_PWRCHK1		0x4
+#define	RTC_PWRCHK1_MAGIC	0xc6
+
+#define MTK_RTC_PWRCHK2		0x8
+#define	RTC_PWRCHK2_MAGIC	0x9a
+
+#define MTK_RTC_KEY		0xc
+#define	RTC_KEY_MAGIC		0x59
+
+#define MTK_RTC_PROT1		0x10
+#define	RTC_PROT1_MAGIC		0xa3
+
+#define MTK_RTC_PROT2		0x14
+#define	RTC_PROT2_MAGIC		0x57
+
+#define MTK_RTC_PROT3		0x18
+#define	RTC_PROT3_MAGIC		0x67
+
+#define MTK_RTC_PROT4		0x1c
+#define	RTC_PROT4_MAGIC		0xd2
+
+#define MTK_RTC_CTL		0x20
+#define	RTC_RC_STOP		BIT(0)
+
+#define MTK_RTC_DEBNCE		0x2c
+#define	RTC_DEBNCE_MASK		GENMASK(2, 0)
+
+#define MTK_RTC_INT		0x30
+#define RTC_INT_AL_STA		BIT(4)
+
+/*
+ * Ranges from 0x40 to 0x78 provide RTC time setup for year, month,
+ * day of month, day of week, hour, minute and second.
+ */
+#define MTK_RTC_TREG(_t, _f)	(0x40 + (0x4 * (_f)) + ((_t) * 0x20))
+
+#define MTK_RTC_AL_CTL		0x7c
+#define	RTC_AL_EN		BIT(0)
+#define	RTC_AL_ALL		GENMASK(7, 0)
+
+/*
+ * The offset is used in the translation for the year between in struct
+ * rtc_time and in hardware register MTK_RTC_TREG(x,MTK_YEA)
+ */
+#define MTK_RTC_TM_YR_OFFSET	100
+
+/*
+ * The lowest value for the valid tm_year. RTC hardware would take incorrectly
+ * tm_year 100 as not a leap year and thus it is also required being excluded
+ * from the valid options.
+ */
+#define MTK_RTC_TM_YR_L		(MTK_RTC_TM_YR_OFFSET + 1)
+
+/*
+ * The most year the RTC can hold is 99 and the next to 99 in year register
+ * would be wraparound to 0, for MT7622.
+ */
+#define MTK_RTC_HW_YR_LIMIT	99
+
+/* The highest value for the valid tm_year */
+#define MTK_RTC_TM_YR_H		(MTK_RTC_TM_YR_OFFSET + MTK_RTC_HW_YR_LIMIT)
+
+/* Simple macro helps to check whether the hardware supports the tm_year */
+#define MTK_RTC_TM_YR_VALID(_y)	((_y) >= MTK_RTC_TM_YR_L && \
+				 (_y) <= MTK_RTC_TM_YR_H)
+
+/* Types of the function the RTC provides are time counter and alarm. */
+enum {
+	MTK_TC,
+	MTK_AL,
+};
+
+/* Indexes are used for the pointer to relevant registers in MTK_RTC_TREG */
+enum {
+	MTK_YEA,
+	MTK_MON,
+	MTK_DOM,
+	MTK_DOW,
+	MTK_HOU,
+	MTK_MIN,
+	MTK_SEC
+};
+
+struct mtk_rtc {
+	struct rtc_device *rtc;
+	void __iomem *base;
+	int irq;
+	struct clk *clk;
+};
+
+static void mtk_w32(struct mtk_rtc *rtc, u32 reg, u32 val)
+{
+	writel_relaxed(val, rtc->base + reg);
+}
+
+static u32 mtk_r32(struct mtk_rtc *rtc, u32 reg)
+{
+	return readl_relaxed(rtc->base + reg);
+}
+
+static void mtk_rmw(struct mtk_rtc *rtc, u32 reg, u32 mask, u32 set)
+{
+	u32 val;
+
+	val = mtk_r32(rtc, reg);
+	val &= ~mask;
+	val |= set;
+	mtk_w32(rtc, reg, val);
+}
+
+static void mtk_set(struct mtk_rtc *rtc, u32 reg, u32 val)
+{
+	mtk_rmw(rtc, reg, 0, val);
+}
+
+static void mtk_clr(struct mtk_rtc *rtc, u32 reg, u32 val)
+{
+	mtk_rmw(rtc, reg, val, 0);
+}
+
+static void mtk_rtc_hw_init(struct mtk_rtc *hw)
+{
+	/* The setup of the init sequence is for allowing RTC got to work */
+	mtk_w32(hw, MTK_RTC_PWRCHK1, RTC_PWRCHK1_MAGIC);
+	mtk_w32(hw, MTK_RTC_PWRCHK2, RTC_PWRCHK2_MAGIC);
+	mtk_w32(hw, MTK_RTC_KEY, RTC_KEY_MAGIC);
+	mtk_w32(hw, MTK_RTC_PROT1, RTC_PROT1_MAGIC);
+	mtk_w32(hw, MTK_RTC_PROT2, RTC_PROT2_MAGIC);
+	mtk_w32(hw, MTK_RTC_PROT3, RTC_PROT3_MAGIC);
+	mtk_w32(hw, MTK_RTC_PROT4, RTC_PROT4_MAGIC);
+	mtk_rmw(hw, MTK_RTC_DEBNCE, RTC_DEBNCE_MASK, 0);
+	mtk_clr(hw, MTK_RTC_CTL, RTC_RC_STOP);
+}
+
+static void mtk_rtc_get_alarm_or_time(struct mtk_rtc *hw, struct rtc_time *tm,
+				      int time_alarm)
+{
+	u32 year, mon, mday, wday, hour, min, sec;
+
+	/*
+	 * Read again until the field of the second is not changed which
+	 * ensures all fields in the consistent state. Note that MTK_SEC must
+	 * be read first. In this way, it guarantees the others remain not
+	 * changed when the results for two MTK_SEC consecutive reads are same.
+	 */
+	do {
+		sec = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_SEC));
+		min = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_MIN));
+		hour = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_HOU));
+		wday = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_DOW));
+		mday = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_DOM));
+		mon = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_MON));
+		year = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_YEA));
+	} while (sec != mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_SEC)));
+
+	tm->tm_sec  = sec;
+	tm->tm_min  = min;
+	tm->tm_hour = hour;
+	tm->tm_wday = wday;
+	tm->tm_mday = mday;
+	tm->tm_mon  = mon - 1;
+
+	/* Rebase to the absolute year which userspace queries */
+	tm->tm_year = year + MTK_RTC_TM_YR_OFFSET;
+}
+
+static void mtk_rtc_set_alarm_or_time(struct mtk_rtc *hw, struct rtc_time *tm,
+				      int time_alarm)
+{
+	u32 year;
+
+	/* Rebase to the relative year which RTC hardware requires */
+	year = tm->tm_year - MTK_RTC_TM_YR_OFFSET;
+
+	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_YEA), year);
+	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_MON), tm->tm_mon + 1);
+	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_DOW), tm->tm_wday);
+	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_DOM), tm->tm_mday);
+	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_HOU), tm->tm_hour);
+	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_MIN), tm->tm_min);
+	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_SEC), tm->tm_sec);
+}
+
+static irqreturn_t mtk_rtc_alarmirq(int irq, void *id)
+{
+	struct mtk_rtc *hw = (struct mtk_rtc *)id;
+	u32 irq_sta;
+
+	irq_sta = mtk_r32(hw, MTK_RTC_INT);
+	if (irq_sta & RTC_INT_AL_STA) {
+		/* Stop alarm also implicitly disables the alarm interrupt */
+		mtk_w32(hw, MTK_RTC_AL_CTL, 0);
+		rtc_update_irq(hw->rtc, 1, RTC_IRQF | RTC_AF);
+
+		/* Ack alarm interrupt status */
+		mtk_w32(hw, MTK_RTC_INT, RTC_INT_AL_STA);
+		return IRQ_HANDLED;
+	}
+
+	return IRQ_NONE;
+}
+
+static int mtk_rtc_gettime(struct device *dev, struct rtc_time *tm)
+{
+	struct mtk_rtc *hw = dev_get_drvdata(dev);
+
+	mtk_rtc_get_alarm_or_time(hw, tm, MTK_TC);
+
+	return rtc_valid_tm(tm);
+}
+
+static int mtk_rtc_settime(struct device *dev, struct rtc_time *tm)
+{
+	struct mtk_rtc *hw = dev_get_drvdata(dev);
+
+	if (!MTK_RTC_TM_YR_VALID(tm->tm_year))
+		return -EINVAL;
+
+	/* Stop time counter before setting a new one*/
+	mtk_set(hw, MTK_RTC_CTL, RTC_RC_STOP);
+
+	mtk_rtc_set_alarm_or_time(hw, tm, MTK_TC);
+
+	/* Restart the time counter */
+	mtk_clr(hw, MTK_RTC_CTL, RTC_RC_STOP);
+
+	return 0;
+}
+
+static int mtk_rtc_getalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
+{
+	struct mtk_rtc *hw = dev_get_drvdata(dev);
+	struct rtc_time *alrm_tm = &wkalrm->time;
+
+	mtk_rtc_get_alarm_or_time(hw, alrm_tm, MTK_AL);
+
+	wkalrm->enabled = !!(mtk_r32(hw, MTK_RTC_AL_CTL) & RTC_AL_EN);
+	wkalrm->pending = !!(mtk_r32(hw, MTK_RTC_INT) & RTC_INT_AL_STA);
+
+	return 0;
+}
+
+static int mtk_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
+{
+	struct mtk_rtc *hw = dev_get_drvdata(dev);
+	struct rtc_time *alrm_tm = &wkalrm->time;
+
+	if (!MTK_RTC_TM_YR_VALID(alrm_tm->tm_year))
+		return -EINVAL;
+
+	/*
+	 * Stop the alarm also implicitly including disables interrupt before
+	 * setting a new one.
+	 */
+	mtk_clr(hw, MTK_RTC_AL_CTL, RTC_AL_EN);
+
+	/*
+	 * Avoid contention between mtk_rtc_setalarm and IRQ handler so that
+	 * disabling the interrupt and awaiting for pending IRQ handler to
+	 * complete.
+	 */
+	synchronize_irq(hw->irq);
+
+	mtk_rtc_set_alarm_or_time(hw, alrm_tm, MTK_AL);
+
+	/* Restart the alarm with the new setup */
+	mtk_w32(hw, MTK_RTC_AL_CTL, RTC_AL_ALL);
+
+	return 0;
+}
+
+static const struct rtc_class_ops mtk_rtc_ops = {
+	.read_time		= mtk_rtc_gettime,
+	.set_time		= mtk_rtc_settime,
+	.read_alarm		= mtk_rtc_getalarm,
+	.set_alarm		= mtk_rtc_setalarm,
+};
+
+static const struct of_device_id mtk_rtc_match[] = {
+	{ .compatible = "mediatek,mt7622-rtc" },
+	{ .compatible = "mediatek,soc-rtc" },
+	{},
+};
+
+static int mtk_rtc_probe(struct platform_device *pdev)
+{
+	struct mtk_rtc *hw;
+	struct resource *res;
+	int ret;
+
+	hw = devm_kzalloc(&pdev->dev, sizeof(*hw), GFP_KERNEL);
+	if (!hw)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, hw);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	hw->base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(hw->base))
+		return PTR_ERR(hw->base);
+
+	hw->clk = devm_clk_get(&pdev->dev, "rtc");
+	if (IS_ERR(hw->clk)) {
+		dev_err(&pdev->dev, "No clock\n");
+		return PTR_ERR(hw->clk);
+	}
+
+	ret = clk_prepare_enable(hw->clk);
+	if (ret)
+		return ret;
+
+	hw->irq = platform_get_irq(pdev, 0);
+	if (hw->irq < 0) {
+		dev_err(&pdev->dev, "No IRQ resource\n");
+		ret = hw->irq;
+		goto err;
+	}
+
+	ret = devm_request_irq(&pdev->dev, hw->irq, mtk_rtc_alarmirq,
+			       0, dev_name(&pdev->dev), hw);
+	if (ret) {
+		dev_err(&pdev->dev, "Can't request IRQ\n");
+		goto err;
+	}
+
+	mtk_rtc_hw_init(hw);
+
+	device_init_wakeup(&pdev->dev, true);
+
+	hw->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
+					   &mtk_rtc_ops, THIS_MODULE);
+	if (IS_ERR(hw->rtc)) {
+		ret = PTR_ERR(hw->rtc);
+		dev_err(&pdev->dev, "Unable to register device\n");
+		goto err;
+	}
+
+	return 0;
+err:
+	clk_disable_unprepare(hw->clk);
+
+	return ret;
+}
+
+static int mtk_rtc_remove(struct platform_device *pdev)
+{
+	struct mtk_rtc *hw = platform_get_drvdata(pdev);
+
+	clk_disable_unprepare(hw->clk);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int mtk_rtc_suspend(struct device *dev)
+{
+	struct mtk_rtc *hw = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(hw->irq);
+
+	return 0;
+}
+
+static int mtk_rtc_resume(struct device *dev)
+{
+	struct mtk_rtc *hw = dev_get_drvdata(dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(hw->irq);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(mtk_rtc_pm_ops, mtk_rtc_suspend, mtk_rtc_resume);
+
+#define MTK_RTC_PM_OPS (&mtk_rtc_pm_ops)
+#else	/* CONFIG_PM */
+#define MTK_RTC_PM_OPS NULL
+#endif	/* CONFIG_PM */
+
+static struct platform_driver mtk_rtc_driver = {
+	.probe	= mtk_rtc_probe,
+	.remove	= mtk_rtc_remove,
+	.driver = {
+		.name = MTK_RTC_DEV,
+		.of_match_table = mtk_rtc_match,
+		.pm = MTK_RTC_PM_OPS,
+	},
+};
+
+module_platform_driver(mtk_rtc_driver);
+
+MODULE_DESCRIPTION("MediaTek SoC based RTC Driver");
+MODULE_AUTHOR("Sean Wang <sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>");
+MODULE_LICENSE("GPL");
-- 
2.7.4

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Re: [PATCH v3 2/4] rtc: mediatek: add driver for RTC on MT7622 SoC

[Yingjoe Chen]

Sean,

Looks good to me. You can add if you want:

Reviewed-by: Yingjoe Chen <yingjoe.chen-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>

Joe.C


On Mon, 2017-10-23 at 15:16 +0800, sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org wrote:
> From: Sean Wang <sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> 
> This patch introduces the driver for the RTC on MT7622 SoC.
> 
> Signed-off-by: Sean Wang <sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> ---
>  drivers/rtc/Kconfig      |  10 ++
>  drivers/rtc/Makefile     |   1 +
>  drivers/rtc/rtc-mt7622.c | 422 +++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 433 insertions(+)
>  create mode 100644 drivers/rtc/rtc-mt7622.c
> 
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index e0e58f3..fd9b590 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -1705,6 +1705,16 @@ config RTC_DRV_MOXART
>  	   This driver can also be built as a module. If so, the module
>  	   will be called rtc-moxart
>  
> +config RTC_DRV_MT7622
> +	tristate "MediaTek SoC based RTC"
> +	depends on ARCH_MEDIATEK || COMPILE_TEST
> +	help
> +	  This enables support for the real time clock built in the MediaTek
> +	  SoCs.
> +
> +	  This drive can also be built as a module. If so, the module
> +	  will be called rtc-mt7622.
> +
>  config RTC_DRV_MT6397
>  	tristate "Mediatek Real Time Clock driver"
>  	depends on MFD_MT6397 || (COMPILE_TEST && IRQ_DOMAIN)
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index 7230014..eb47f8c 100644
> --- a/drivers/rtc/Makefile
> +++ b/drivers/rtc/Makefile
> @@ -101,6 +101,7 @@ obj-$(CONFIG_RTC_DRV_MOXART)	+= rtc-moxart.o
>  obj-$(CONFIG_RTC_DRV_MPC5121)	+= rtc-mpc5121.o
>  obj-$(CONFIG_RTC_DRV_VRTC)	+= rtc-mrst.o
>  obj-$(CONFIG_RTC_DRV_MSM6242)	+= rtc-msm6242.o
> +obj-$(CONFIG_RTC_DRV_MT7622)	+= rtc-mt7622.o
>  obj-$(CONFIG_RTC_DRV_MT6397)	+= rtc-mt6397.o
>  obj-$(CONFIG_RTC_DRV_MV)	+= rtc-mv.o
>  obj-$(CONFIG_RTC_DRV_MXC)	+= rtc-mxc.o
> diff --git a/drivers/rtc/rtc-mt7622.c b/drivers/rtc/rtc-mt7622.c
> new file mode 100644
> index 0000000..d79b9ae
> --- /dev/null
> +++ b/drivers/rtc/rtc-mt7622.c
> @@ -0,0 +1,422 @@
> +/*
> + * Driver for MediaTek SoC based RTC
> + *
> + * Copyright (C) 2017 Sean Wang <sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation; either version 2 of
> + * the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/of_address.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/rtc.h>
> +
> +#define MTK_RTC_DEV KBUILD_MODNAME
> +
> +#define MTK_RTC_PWRCHK1		0x4
> +#define	RTC_PWRCHK1_MAGIC	0xc6
> +
> +#define MTK_RTC_PWRCHK2		0x8
> +#define	RTC_PWRCHK2_MAGIC	0x9a
> +
> +#define MTK_RTC_KEY		0xc
> +#define	RTC_KEY_MAGIC		0x59
> +
> +#define MTK_RTC_PROT1		0x10
> +#define	RTC_PROT1_MAGIC		0xa3
> +
> +#define MTK_RTC_PROT2		0x14
> +#define	RTC_PROT2_MAGIC		0x57
> +
> +#define MTK_RTC_PROT3		0x18
> +#define	RTC_PROT3_MAGIC		0x67
> +
> +#define MTK_RTC_PROT4		0x1c
> +#define	RTC_PROT4_MAGIC		0xd2
> +
> +#define MTK_RTC_CTL		0x20
> +#define	RTC_RC_STOP		BIT(0)
> +
> +#define MTK_RTC_DEBNCE		0x2c
> +#define	RTC_DEBNCE_MASK		GENMASK(2, 0)
> +
> +#define MTK_RTC_INT		0x30
> +#define RTC_INT_AL_STA		BIT(4)
> +
> +/*
> + * Ranges from 0x40 to 0x78 provide RTC time setup for year, month,
> + * day of month, day of week, hour, minute and second.
> + */
> +#define MTK_RTC_TREG(_t, _f)	(0x40 + (0x4 * (_f)) + ((_t) * 0x20))
> +
> +#define MTK_RTC_AL_CTL		0x7c
> +#define	RTC_AL_EN		BIT(0)
> +#define	RTC_AL_ALL		GENMASK(7, 0)
> +
> +/*
> + * The offset is used in the translation for the year between in struct
> + * rtc_time and in hardware register MTK_RTC_TREG(x,MTK_YEA)
> + */
> +#define MTK_RTC_TM_YR_OFFSET	100
> +
> +/*
> + * The lowest value for the valid tm_year. RTC hardware would take incorrectly
> + * tm_year 100 as not a leap year and thus it is also required being excluded
> + * from the valid options.
> + */
> +#define MTK_RTC_TM_YR_L		(MTK_RTC_TM_YR_OFFSET + 1)
> +
> +/*
> + * The most year the RTC can hold is 99 and the next to 99 in year register
> + * would be wraparound to 0, for MT7622.
> + */
> +#define MTK_RTC_HW_YR_LIMIT	99
> +
> +/* The highest value for the valid tm_year */
> +#define MTK_RTC_TM_YR_H		(MTK_RTC_TM_YR_OFFSET + MTK_RTC_HW_YR_LIMIT)
> +
> +/* Simple macro helps to check whether the hardware supports the tm_year */
> +#define MTK_RTC_TM_YR_VALID(_y)	((_y) >= MTK_RTC_TM_YR_L && \
> +				 (_y) <= MTK_RTC_TM_YR_H)
> +
> +/* Types of the function the RTC provides are time counter and alarm. */
> +enum {
> +	MTK_TC,
> +	MTK_AL,
> +};
> +
> +/* Indexes are used for the pointer to relevant registers in MTK_RTC_TREG */
> +enum {
> +	MTK_YEA,
> +	MTK_MON,
> +	MTK_DOM,
> +	MTK_DOW,
> +	MTK_HOU,
> +	MTK_MIN,
> +	MTK_SEC
> +};
> +
> +struct mtk_rtc {
> +	struct rtc_device *rtc;
> +	void __iomem *base;
> +	int irq;
> +	struct clk *clk;
> +};
> +
> +static void mtk_w32(struct mtk_rtc *rtc, u32 reg, u32 val)
> +{
> +	writel_relaxed(val, rtc->base + reg);
> +}
> +
> +static u32 mtk_r32(struct mtk_rtc *rtc, u32 reg)
> +{
> +	return readl_relaxed(rtc->base + reg);
> +}
> +
> +static void mtk_rmw(struct mtk_rtc *rtc, u32 reg, u32 mask, u32 set)
> +{
> +	u32 val;
> +
> +	val = mtk_r32(rtc, reg);
> +	val &= ~mask;
> +	val |= set;
> +	mtk_w32(rtc, reg, val);
> +}
> +
> +static void mtk_set(struct mtk_rtc *rtc, u32 reg, u32 val)
> +{
> +	mtk_rmw(rtc, reg, 0, val);
> +}
> +
> +static void mtk_clr(struct mtk_rtc *rtc, u32 reg, u32 val)
> +{
> +	mtk_rmw(rtc, reg, val, 0);
> +}
> +
> +static void mtk_rtc_hw_init(struct mtk_rtc *hw)
> +{
> +	/* The setup of the init sequence is for allowing RTC got to work */
> +	mtk_w32(hw, MTK_RTC_PWRCHK1, RTC_PWRCHK1_MAGIC);
> +	mtk_w32(hw, MTK_RTC_PWRCHK2, RTC_PWRCHK2_MAGIC);
> +	mtk_w32(hw, MTK_RTC_KEY, RTC_KEY_MAGIC);
> +	mtk_w32(hw, MTK_RTC_PROT1, RTC_PROT1_MAGIC);
> +	mtk_w32(hw, MTK_RTC_PROT2, RTC_PROT2_MAGIC);
> +	mtk_w32(hw, MTK_RTC_PROT3, RTC_PROT3_MAGIC);
> +	mtk_w32(hw, MTK_RTC_PROT4, RTC_PROT4_MAGIC);
> +	mtk_rmw(hw, MTK_RTC_DEBNCE, RTC_DEBNCE_MASK, 0);
> +	mtk_clr(hw, MTK_RTC_CTL, RTC_RC_STOP);
> +}
> +
> +static void mtk_rtc_get_alarm_or_time(struct mtk_rtc *hw, struct rtc_time *tm,
> +				      int time_alarm)
> +{
> +	u32 year, mon, mday, wday, hour, min, sec;
> +
> +	/*
> +	 * Read again until the field of the second is not changed which
> +	 * ensures all fields in the consistent state. Note that MTK_SEC must
> +	 * be read first. In this way, it guarantees the others remain not
> +	 * changed when the results for two MTK_SEC consecutive reads are same.
> +	 */
> +	do {
> +		sec = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_SEC));
> +		min = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_MIN));
> +		hour = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_HOU));
> +		wday = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_DOW));
> +		mday = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_DOM));
> +		mon = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_MON));
> +		year = mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_YEA));
> +	} while (sec != mtk_r32(hw, MTK_RTC_TREG(time_alarm, MTK_SEC)));
> +
> +	tm->tm_sec  = sec;
> +	tm->tm_min  = min;
> +	tm->tm_hour = hour;
> +	tm->tm_wday = wday;
> +	tm->tm_mday = mday;
> +	tm->tm_mon  = mon - 1;
> +
> +	/* Rebase to the absolute year which userspace queries */
> +	tm->tm_year = year + MTK_RTC_TM_YR_OFFSET;
> +}
> +
> +static void mtk_rtc_set_alarm_or_time(struct mtk_rtc *hw, struct rtc_time *tm,
> +				      int time_alarm)
> +{
> +	u32 year;
> +
> +	/* Rebase to the relative year which RTC hardware requires */
> +	year = tm->tm_year - MTK_RTC_TM_YR_OFFSET;
> +
> +	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_YEA), year);
> +	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_MON), tm->tm_mon + 1);
> +	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_DOW), tm->tm_wday);
> +	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_DOM), tm->tm_mday);
> +	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_HOU), tm->tm_hour);
> +	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_MIN), tm->tm_min);
> +	mtk_w32(hw, MTK_RTC_TREG(time_alarm, MTK_SEC), tm->tm_sec);
> +}
> +
> +static irqreturn_t mtk_rtc_alarmirq(int irq, void *id)
> +{
> +	struct mtk_rtc *hw = (struct mtk_rtc *)id;
> +	u32 irq_sta;
> +
> +	irq_sta = mtk_r32(hw, MTK_RTC_INT);
> +	if (irq_sta & RTC_INT_AL_STA) {
> +		/* Stop alarm also implicitly disables the alarm interrupt */
> +		mtk_w32(hw, MTK_RTC_AL_CTL, 0);
> +		rtc_update_irq(hw->rtc, 1, RTC_IRQF | RTC_AF);
> +
> +		/* Ack alarm interrupt status */
> +		mtk_w32(hw, MTK_RTC_INT, RTC_INT_AL_STA);
> +		return IRQ_HANDLED;
> +	}
> +
> +	return IRQ_NONE;
> +}
> +
> +static int mtk_rtc_gettime(struct device *dev, struct rtc_time *tm)
> +{
> +	struct mtk_rtc *hw = dev_get_drvdata(dev);
> +
> +	mtk_rtc_get_alarm_or_time(hw, tm, MTK_TC);
> +
> +	return rtc_valid_tm(tm);
> +}
> +
> +static int mtk_rtc_settime(struct device *dev, struct rtc_time *tm)
> +{
> +	struct mtk_rtc *hw = dev_get_drvdata(dev);
> +
> +	if (!MTK_RTC_TM_YR_VALID(tm->tm_year))
> +		return -EINVAL;
> +
> +	/* Stop time counter before setting a new one*/
> +	mtk_set(hw, MTK_RTC_CTL, RTC_RC_STOP);
> +
> +	mtk_rtc_set_alarm_or_time(hw, tm, MTK_TC);
> +
> +	/* Restart the time counter */
> +	mtk_clr(hw, MTK_RTC_CTL, RTC_RC_STOP);
> +
> +	return 0;
> +}
> +
> +static int mtk_rtc_getalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
> +{
> +	struct mtk_rtc *hw = dev_get_drvdata(dev);
> +	struct rtc_time *alrm_tm = &wkalrm->time;
> +
> +	mtk_rtc_get_alarm_or_time(hw, alrm_tm, MTK_AL);
> +
> +	wkalrm->enabled = !!(mtk_r32(hw, MTK_RTC_AL_CTL) & RTC_AL_EN);
> +	wkalrm->pending = !!(mtk_r32(hw, MTK_RTC_INT) & RTC_INT_AL_STA);
> +
> +	return 0;
> +}
> +
> +static int mtk_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
> +{
> +	struct mtk_rtc *hw = dev_get_drvdata(dev);
> +	struct rtc_time *alrm_tm = &wkalrm->time;
> +
> +	if (!MTK_RTC_TM_YR_VALID(alrm_tm->tm_year))
> +		return -EINVAL;
> +
> +	/*
> +	 * Stop the alarm also implicitly including disables interrupt before
> +	 * setting a new one.
> +	 */
> +	mtk_clr(hw, MTK_RTC_AL_CTL, RTC_AL_EN);
> +
> +	/*
> +	 * Avoid contention between mtk_rtc_setalarm and IRQ handler so that
> +	 * disabling the interrupt and awaiting for pending IRQ handler to
> +	 * complete.
> +	 */
> +	synchronize_irq(hw->irq);
> +
> +	mtk_rtc_set_alarm_or_time(hw, alrm_tm, MTK_AL);
> +
> +	/* Restart the alarm with the new setup */
> +	mtk_w32(hw, MTK_RTC_AL_CTL, RTC_AL_ALL);
> +
> +	return 0;
> +}
> +
> +static const struct rtc_class_ops mtk_rtc_ops = {
> +	.read_time		= mtk_rtc_gettime,
> +	.set_time		= mtk_rtc_settime,
> +	.read_alarm		= mtk_rtc_getalarm,
> +	.set_alarm		= mtk_rtc_setalarm,
> +};
> +
> +static const struct of_device_id mtk_rtc_match[] = {
> +	{ .compatible = "mediatek,mt7622-rtc" },
> +	{ .compatible = "mediatek,soc-rtc" },
> +	{},
> +};
> +
> +static int mtk_rtc_probe(struct platform_device *pdev)
> +{
> +	struct mtk_rtc *hw;
> +	struct resource *res;
> +	int ret;
> +
> +	hw = devm_kzalloc(&pdev->dev, sizeof(*hw), GFP_KERNEL);
> +	if (!hw)
> +		return -ENOMEM;
> +
> +	platform_set_drvdata(pdev, hw);
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	hw->base = devm_ioremap_resource(&pdev->dev, res);
> +	if (IS_ERR(hw->base))
> +		return PTR_ERR(hw->base);
> +
> +	hw->clk = devm_clk_get(&pdev->dev, "rtc");
> +	if (IS_ERR(hw->clk)) {
> +		dev_err(&pdev->dev, "No clock\n");
> +		return PTR_ERR(hw->clk);
> +	}
> +
> +	ret = clk_prepare_enable(hw->clk);
> +	if (ret)
> +		return ret;
> +
> +	hw->irq = platform_get_irq(pdev, 0);
> +	if (hw->irq < 0) {
> +		dev_err(&pdev->dev, "No IRQ resource\n");
> +		ret = hw->irq;
> +		goto err;
> +	}
> +
> +	ret = devm_request_irq(&pdev->dev, hw->irq, mtk_rtc_alarmirq,
> +			       0, dev_name(&pdev->dev), hw);
> +	if (ret) {
> +		dev_err(&pdev->dev, "Can't request IRQ\n");
> +		goto err;
> +	}
> +
> +	mtk_rtc_hw_init(hw);
> +
> +	device_init_wakeup(&pdev->dev, true);
> +
> +	hw->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
> +					   &mtk_rtc_ops, THIS_MODULE);
> +	if (IS_ERR(hw->rtc)) {
> +		ret = PTR_ERR(hw->rtc);
> +		dev_err(&pdev->dev, "Unable to register device\n");
> +		goto err;
> +	}
> +
> +	return 0;
> +err:
> +	clk_disable_unprepare(hw->clk);
> +
> +	return ret;
> +}
> +
> +static int mtk_rtc_remove(struct platform_device *pdev)
> +{
> +	struct mtk_rtc *hw = platform_get_drvdata(pdev);
> +
> +	clk_disable_unprepare(hw->clk);
> +
> +	return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int mtk_rtc_suspend(struct device *dev)
> +{
> +	struct mtk_rtc *hw = dev_get_drvdata(dev);
> +
> +	if (device_may_wakeup(dev))
> +		enable_irq_wake(hw->irq);
> +
> +	return 0;
> +}
> +
> +static int mtk_rtc_resume(struct device *dev)
> +{
> +	struct mtk_rtc *hw = dev_get_drvdata(dev);
> +
> +	if (device_may_wakeup(dev))
> +		disable_irq_wake(hw->irq);
> +
> +	return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(mtk_rtc_pm_ops, mtk_rtc_suspend, mtk_rtc_resume);
> +
> +#define MTK_RTC_PM_OPS (&mtk_rtc_pm_ops)
> +#else	/* CONFIG_PM */
> +#define MTK_RTC_PM_OPS NULL
> +#endif	/* CONFIG_PM */
> +
> +static struct platform_driver mtk_rtc_driver = {
> +	.probe	= mtk_rtc_probe,
> +	.remove	= mtk_rtc_remove,
> +	.driver = {
> +		.name = MTK_RTC_DEV,
> +		.of_match_table = mtk_rtc_match,
> +		.pm = MTK_RTC_PM_OPS,
> +	},
> +};
> +
> +module_platform_driver(mtk_rtc_driver);
> +
> +MODULE_DESCRIPTION("MediaTek SoC based RTC Driver");
> +MODULE_AUTHOR("Sean Wang <sean.wang-NuS5LvNUpcJWk0Htik3J/w@public.gmane.org>");
> +MODULE_LICENSE("GPL");


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[PATCH v3 3/4] rtc: mediatek: enhance the description for MediaTek PMIC based RTC

[sean.wang]

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

Give a better description for original MediaTek RTC driver as PMIC based
RTC in order to distinguish SoC based RTC. Also turning all words with
Mediatek to MediaTek here.

Cc: Eddie Huang <eddie.huang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Acked-by: Eddie Huang <eddie.huang@mediatek.com>
---
 drivers/rtc/Kconfig | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index fd9b590..6a315cb 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1716,14 +1716,14 @@ config RTC_DRV_MT7622
 	  will be called rtc-mt7622.
 
 config RTC_DRV_MT6397
-	tristate "Mediatek Real Time Clock driver"
+	tristate "MediaTek PMIC based RTC"
 	depends on MFD_MT6397 || (COMPILE_TEST && IRQ_DOMAIN)
 	help
-	  This selects the Mediatek(R) RTC driver. RTC is part of Mediatek
+	  This selects the MediaTek(R) RTC driver. RTC is part of MediaTek
 	  MT6397 PMIC. You should enable MT6397 PMIC MFD before select
-	  Mediatek(R) RTC driver.
+	  MediaTek(R) RTC driver.
 
-	  If you want to use Mediatek(R) RTC interface, select Y or M here.
+	  If you want to use MediaTek(R) RTC interface, select Y or M here.
 
 config RTC_DRV_XGENE
 	tristate "APM X-Gene RTC"
-- 
2.7.4

[PATCH v3 4/4] rtc: mediatek: update MAINTAINERS entry with MediaTek RTC driver

[sean.wang]

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

I work for MediaTek on maintaining the MediaTek SoC based RTC driver for
the existing SoCs and keep adding support for the following SoCs in the
future.

Cc: Eddie Huang <eddie.huang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
---
 MAINTAINERS | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index 2281af4..332c04c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -1579,10 +1579,13 @@ F:	drivers/rtc/rtc-armada38x.c
 
 ARM/Mediatek RTC DRIVER
 M:	Eddie Huang <eddie.huang@mediatek.com>
+M:	Sean Wang <sean.wang@mediatek.com>
 L:	linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
 L:	linux-mediatek@lists.infradead.org (moderated for non-subscribers)
 S:	Maintained
+F:	Documentation/devicetree/bindings/rtc/rtc-mt7622.txt
 F:	drivers/rtc/rtc-mt6397.c
+F:	drivers/rtc/rtc-mt7622.c
 
 ARM/Mediatek SoC support
 M:	Matthias Brugger <matthias.bgg@gmail.com>
-- 
2.7.4

Re: [PATCH v3 0/4] rtc: mediatek: add support for SoC based RTC on MT7622

[Alexandre Belloni]

Hi,

On 23/10/2017 at 15:16:43 +0800, sean.wang@mediatek.com wrote:
> From: Sean Wang <sean.wang@mediatek.com>
> 
> Changes since v2:
> - Remove time extension with yr_base 
> - Add fixup that ensures all time fields in hardware keeping consistency
> inside the mtk_rtc_get_alarm_or_time call
> - Add validity for time range should be between 2001 to 2099
> - Enhance comments with aligned style and explanation for certain limiation in
> hardware
> - Rename dt-binding naming from rtc-mediatek.txt to rtc-mt7622.txt
> - Rename config naming from RTC_DRV_MEDIATEK to RTC_DRV_MT7622
> 
> Changes since v1:
> - Rename to rtc-mt7622.c from rtc-mediatek.c
> - Use [readl,writel]_relaxed instead of __raw_* version
> - Remove redundant register reading in mtk_rtc_get_alarm_or_time()
> - Stop alarm when alarm is really expired in mtk_rtc_alarmirq()
> - Extend the maximum year the RTC/Alarm can count/support using year rebasing
> - Remove unnesscary log which is already done in core layer
> 
> This patchset introduces support for MediaTek SoC based real time clock
> (RTC) Currently, the driver is already tested successfully with hwclock
> and wakealarm on MT7622 SoC. And it should also be workable on other
> similar MediaTek SoCs. And patch 3 is a distinct patch used to distinguish
> between either SoC based or PMIC based RTC to avoid confusion for the RTC
> selection for the target SoC.
> 
> Sean Wang (4):
>   dt-bindings: rtc: mediatek: add bindings for MediaTek SoC based RTC
>   rtc: mediatek: add driver for RTC on MT7622 SoC
>   rtc: mediatek: enhance the description for MediaTek PMIC based RTC
>   rtc: mediatek: update MAINTAINERS entry with MediaTek RTC driver
> 

All applied, thanks. (I've alphabetically ordered Kconfig and Makefile
entries in patch 2)

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com