Merge tag 'rtc-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

Pull RTC updates from Alexandre Belloni:
 "Most of the changes are a rework of the cmos driver by Rafael and
  fixes for issues found using static checkers. The removal of a driver
  leads to a reduction of the number of LOC of the subsystem.

  Removed driver:
   - davinci

  Updates:
   - convert i2c drivers to .probe_new
   - fix spelling mistakes and duplicated words in comments
   - cmos: rework wake setup and ACPI event handling
   - cros-ec: Limit RTC alarm range to fix alarmtimer
   - ds1347: fix century register handling
   - efi: wakeup support
   - isl12022: temperature sensor support
   - pcf85063: fix read_alarm and clkout
   - pcf8523: use stop bit to detect invalid time
   - pcf8563: use RTC_FEATURE_ALARM
   - snvs: be more flexible on LPSRT reads
   - many static checker fixes"

* tag 'rtc-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (48 commits)
  rtc: ds1742: use devm_platform_get_and_ioremap_resource()
  rtc: mxc_v2: Add missing clk_disable_unprepare()
  rtc: rs5c313: correct some spelling mistakes
  rtc: at91rm9200: Fix syntax errors in comments
  rtc: remove duplicated words in comments
  rtc: rv3028: Use IRQ flags obtained from device tree if available
  rtc: ds1307: use sysfs_emit() to instead of scnprintf()
  rtc: isl12026: drop obsolete dependency on COMPILE_TEST
  dt-bindings: rtc: m41t80: Convert text schema to YAML one
  rtc: pcf85063: fix pcf85063_clkout_control
  rtc: rx6110: fix warning with !OF
  rtc: rk808: reduce 'struct rk808' usage
  rtc: msc313: Fix function prototype mismatch in msc313_rtc_probe()
  dt-bindings: rtc: convert rtc-meson.txt to dt-schema
  rtc: pic32: Move devm_rtc_allocate_device earlier in pic32_rtc_probe()
  rtc: st-lpc: Add missing clk_disable_unprepare in st_rtc_probe()
  rtc: pcf85063: Fix reading alarm
  rtc: pcf8523: fix for stop bit
  rtc: efi: Add wakeup support
  rtc: pcf8563: clear RTC_FEATURE_ALARM if no irq
  ...

49 files changed, 674 insertions, 1000 deletions

diff --git a/Documentation/devicetree/bindings/rtc/amlogic,meson6-rtc.yaml b/Documentation/devicetree/bindings/rtc/amlogic,meson6-rtc.yaml
new file mode 100644
index 000000000000..8bf7d3a9be98
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/amlogic,meson6-rtc.yaml
@@ -0,0 +1,62 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/amlogic,meson6-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic Meson6, Meson8, Meson8b and Meson8m2 RTC
+
+maintainers:
+  - Neil Armstrong <neil.armstrong@linaro.org>
+  - Martin Blumenstingl <martin.blumenstingl@googlemail.com>
+
+allOf:
+  - $ref: rtc.yaml#
+  - $ref: /schemas/nvmem/nvmem.yaml#
+
+properties:
+  compatible:
+    enum:
+      - amlogic,meson6-rtc
+      - amlogic,meson8-rtc
+      - amlogic,meson8b-rtc
+      - amlogic,meson8m2-rtc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  resets:
+    maxItems: 1
+
+  vdd-supply: true
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    rtc: rtc@740 {
+        compatible = "amlogic,meson6-rtc";
+        reg = <0x740 0x14>;
+        interrupts = <GIC_SPI 72 IRQ_TYPE_EDGE_RISING>;
+        clocks = <&rtc32k_xtal>;
+        vdd-supply = <&rtc_vdd>;
+        resets = <&reset_rtc>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        mac@0 {
+            reg = <0 6>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt b/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt
deleted file mode 100644
index a8934fe2ab4c..000000000000
--- a/Documentation/devicetree/bindings/rtc/haoyu,hym8563.txt
+++ /dev/null
@@ -1,30 +0,0 @@
-Haoyu Microelectronics HYM8563 Real Time Clock
-
-The HYM8563 provides basic rtc and alarm functionality
-as well as a clock output of up to 32kHz.
-
-Required properties:
-- compatible: should be: "haoyu,hym8563"
-- reg: i2c address
-- #clock-cells: the value should be 0
-
-Optional properties:
-- clock-output-names: From common clock binding
-- interrupts: rtc alarm/event interrupt
-
-Example:
-
-hym8563: hym8563@51 {
-	compatible = "haoyu,hym8563";
-	reg = <0x51>;
-
-	interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
-
-	#clock-cells = <0>;
-};
-
-device {
-...
-	clocks = <&hym8563>;
-...
-};
diff --git a/Documentation/devicetree/bindings/rtc/haoyu,hym8563.yaml b/Documentation/devicetree/bindings/rtc/haoyu,hym8563.yaml
new file mode 100644
index 000000000000..0b9f39ef0edc
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/haoyu,hym8563.yaml
@@ -0,0 +1,56 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/haoyu,hym8563.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Haoyu Microelectronics HYM8563 RTC
+
+maintainers:
+  - Alexandre Belloni <alexandre.belloni@bootlin.com>
+
+properties:
+  compatible:
+    const: haoyu,hym8563
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#clock-cells":
+    const: 0
+
+  clock-output-names:
+    description: From common clock binding to override the default output clock name.
+    maxItems: 1
+
+  wakeup-source:
+    description: Enables wake up of host system on alarm.
+
+allOf:
+  - $ref: rtc.yaml
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - "#clock-cells"
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        rtc@51 {
+            compatible = "haoyu,hym8563";
+            reg = <0x51>;
+            interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
+            #clock-cells = <0>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/rtc/qcom-pm8xxx-rtc.yaml b/Documentation/devicetree/bindings/rtc/qcom-pm8xxx-rtc.yaml
index 23ab5bb4f395..0a7aa29563c1 100644
--- a/Documentation/devicetree/bindings/rtc/qcom-pm8xxx-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/qcom-pm8xxx-rtc.yaml
@@ -11,12 +11,16 @@ maintainers:
 
 properties:
   compatible:
-    enum:
-      - qcom,pm8058-rtc
-      - qcom,pm8921-rtc
-      - qcom,pm8941-rtc
-      - qcom,pm8018-rtc
-      - qcom,pmk8350-rtc
+    oneOf:
+      - enum:
+          - qcom,pm8058-rtc
+          - qcom,pm8921-rtc
+          - qcom,pm8941-rtc
+          - qcom,pmk8350-rtc
+      - items:
+          - enum:
+              - qcom,pm8018-rtc
+          - const: qcom,pm8921-rtc
 
   reg:
     minItems: 1
diff --git a/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt b/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
deleted file mode 100644
index cdd196b1e9bd..000000000000
--- a/Documentation/devicetree/bindings/rtc/rtc-m41t80.txt
+++ /dev/null
@@ -1,39 +0,0 @@
-ST M41T80 family of RTC and compatible
-
-Required properties:
-- compatible: should be one of:
-	"st,m41t62",
-	"st,m41t65",
-	"st,m41t80",
-	"st,m41t81",
-	"st,m41t81s",
-	"st,m41t82",
-	"st,m41t83",
-	"st,m41t84",
-	"st,m41t85",
-	"st,m41t87",
-	"microcrystal,rv4162",
-- reg: I2C bus address of the device
-
-Optional properties:
-- interrupts: rtc alarm interrupt.
-- clock-output-names: From common clock binding to override the default output
-                      clock name
-- wakeup-source: Enables wake up of host system on alarm
-
-Optional child node:
-- clock: Provide this if the square wave pin is used as boot-enabled fixed clock.
-
-Example:
-	rtc@68 {
-		compatible = "st,m41t80";
-		reg = <0x68>;
-		interrupt-parent = <&UIC0>;
-		interrupts = <0x9 0x8>;
-
-		clock {
-			compatible = "fixed-clock";
-			#clock-cells = <0>;
-			clock-frequency = <32768>;
-		};
-	};
diff --git a/Documentation/devicetree/bindings/rtc/rtc-meson.txt b/Documentation/devicetree/bindings/rtc/rtc-meson.txt
deleted file mode 100644
index e921fe66a362..000000000000
--- a/Documentation/devicetree/bindings/rtc/rtc-meson.txt
+++ /dev/null
@@ -1,35 +0,0 @@
-* Amlogic Meson6, Meson8, Meson8b and Meson8m2 RTC
-
-Required properties:
-- compatible: should be one of the following describing the hardware:
-	* "amlogic,meson6-rtc"
-	* "amlogic,meson8-rtc"
-	* "amlogic,meson8b-rtc"
-	* "amlogic,meson8m2-rtc"
-
-- reg: physical register space for the controller's memory mapped registers.
-- interrupts: the interrupt line of the RTC block.
-- clocks: reference to the external 32.768kHz crystal oscillator.
-- vdd-supply: reference to the power supply of the RTC block.
-- resets: reset controller reference to allow reset of the controller
-
-Optional properties for the battery-backed non-volatile memory:
-- #address-cells: should be 1 to address the battery-backed non-volatile memory
-- #size-cells: should be 1 to reference the battery-backed non-volatile memory
-
-Optional child nodes:
-- see ../nvmem/nvmem.txt
-
-Example:
-
-	rtc: rtc@740 {
-		compatible = "amlogic,meson6-rtc";
-		reg = <0x740 0x14>;
-		interrupts = <GIC_SPI 72 IRQ_TYPE_EDGE_RISING>;
-		clocks = <&rtc32k_xtal>;
-		vdd-supply = <&rtc_vdd>;
-		resets = <&reset RESET_RTC>;
-
-		#address-cells = <1>;
-		#size-cells = <1>;
-	};
diff --git a/Documentation/devicetree/bindings/rtc/st,m41t80.yaml b/Documentation/devicetree/bindings/rtc/st,m41t80.yaml
new file mode 100644
index 000000000000..fc9c6da6483f
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/st,m41t80.yaml
@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/rtc/st,m41t80.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: ST M41T80 family of RTC and compatible
+
+maintainers:
+  - Alexandre Belloni <alexandre.belloni@bootlin.com>
+
+properties:
+  compatible:
+    enum:
+      - st,m41t62
+      - st,m41t65
+      - st,m41t80
+      - st,m41t81
+      - st,m41t81s
+      - st,m41t82
+      - st,m41t83
+      - st,m41t84
+      - st,m41t85
+      - st,m41t87
+      - microcrystal,rv4162
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#clock-cells":
+    const: 1
+
+  clock-output-names:
+    maxItems: 1
+    description: From common clock binding to override the default output clock name.
+
+  clock:
+    type: object
+    $ref: /schemas/clock/fixed-clock.yaml#
+    properties:
+      clock-frequency:
+        const: 32768
+
+allOf:
+  - $ref: rtc.yaml
+
+unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      rtc@68 {
+        compatible = "st,m41t80";
+        reg = <0x68>;
+        interrupt-parent = <&UIC0>;
+        interrupts = <0x9 0x8>;
+
+        clock {
+          compatible = "fixed-clock";
+          #clock-cells = <0>;
+          clock-frequency = <32768>;
+        };
+      };
+    };
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index bb63edb507da..2bb640d1521d 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -433,7 +433,7 @@ config RTC_DRV_ISL12022
 
 config RTC_DRV_ISL12026
 	tristate "Intersil ISL12026"
-	depends on OF || COMPILE_TEST
+	depends on OF
 	help
 	  If you say yes here you get support for the
 	  Intersil ISL12026 RTC chip.
@@ -1351,16 +1351,6 @@ config RTC_DRV_ASM9260
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-asm9260.
 
-config RTC_DRV_DAVINCI
-	tristate "TI DaVinci RTC"
-	depends on ARCH_DAVINCI_DM365 || COMPILE_TEST
-	help
-	  If you say yes here you get support for the RTC on the
-	  DaVinci platforms (DM365).
-
-	  This driver can also be built as a module. If so, the module
-	  will be called rtc-davinci.
-
 config RTC_DRV_DIGICOLOR
 	tristate "Conexant Digicolor RTC"
 	depends on ARCH_DIGICOLOR || COMPILE_TEST
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index aab22bc63432..791994eb913d 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -44,7 +44,6 @@ obj-$(CONFIG_RTC_DRV_CROS_EC)	+= rtc-cros-ec.o
 obj-$(CONFIG_RTC_DRV_DA9052)	+= rtc-da9052.o
 obj-$(CONFIG_RTC_DRV_DA9055)	+= rtc-da9055.o
 obj-$(CONFIG_RTC_DRV_DA9063)	+= rtc-da9063.o
-obj-$(CONFIG_RTC_DRV_DAVINCI)	+= rtc-davinci.o
 obj-$(CONFIG_RTC_DRV_DIGICOLOR)	+= rtc-digicolor.o
 obj-$(CONFIG_RTC_DRV_DM355EVM)	+= rtc-dm355evm.o
 obj-$(CONFIG_RTC_DRV_DS1216)	+= rtc-ds1216.o
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c
index e48223c00c67..e5b7b48cffac 100644
--- a/drivers/rtc/class.c
+++ b/drivers/rtc/class.c
@@ -374,11 +374,11 @@ struct rtc_device *devm_rtc_allocate_device(struct device *dev)
 
 	rtc->id = id;
 	rtc->dev.parent = dev;
-	err = dev_set_name(&rtc->dev, "rtc%d", id);
+	err = devm_add_action_or_reset(dev, devm_rtc_release_device, rtc);
 	if (err)
 		return ERR_PTR(err);
 
-	err = devm_add_action_or_reset(dev, devm_rtc_release_device, rtc);
+	err = dev_set_name(&rtc->dev, "rtc%d", id);
 	if (err)
 		return ERR_PTR(err);
 
diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index 9edd662c69ac..7c30cb3c764d 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -256,7 +256,7 @@ int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm)
 	 *
 	 * This could all instead be done in the lower level driver,
 	 * but since more than one lower level RTC implementation needs it,
-	 * then it's probably best best to do it here instead of there..
+	 * then it's probably best to do it here instead of there..
 	 */
 
 	/* Get the "before" timestamp */
diff --git a/drivers/rtc/rtc-abx80x.c b/drivers/rtc/rtc-abx80x.c
index 9b0138d07232..2e0e6432901b 100644
--- a/drivers/rtc/rtc-abx80x.c
+++ b/drivers/rtc/rtc-abx80x.c
@@ -12,6 +12,7 @@
 
 #include <linux/bcd.h>
 #include <linux/i2c.h>
+#include <linux/kstrtox.h>
 #include <linux/module.h>
 #include <linux/of_device.h>
 #include <linux/rtc.h>
@@ -673,13 +674,28 @@ static int abx80x_setup_watchdog(struct abx80x_priv *priv)
 }
 #endif
 
-static int abx80x_probe(struct i2c_client *client,
-			const struct i2c_device_id *id)
+static const struct i2c_device_id abx80x_id[] = {
+	{ "abx80x", ABX80X },
+	{ "ab0801", AB0801 },
+	{ "ab0803", AB0803 },
+	{ "ab0804", AB0804 },
+	{ "ab0805", AB0805 },
+	{ "ab1801", AB1801 },
+	{ "ab1803", AB1803 },
+	{ "ab1804", AB1804 },
+	{ "ab1805", AB1805 },
+	{ "rv1805", RV1805 },
+	{ }
+};
+MODULE_DEVICE_TABLE(i2c, abx80x_id);
+
+static int abx80x_probe(struct i2c_client *client)
 {
 	struct device_node *np = client->dev.of_node;
 	struct abx80x_priv *priv;
 	int i, data, err, trickle_cfg = -EINVAL;
 	char buf[7];
+	const struct i2c_device_id *id = i2c_match_id(abx80x_id, client);
 	unsigned int part = id->driver_data;
 	unsigned int partnumber;
 	unsigned int majrev, minrev;
@@ -847,21 +863,6 @@ static int abx80x_probe(struct i2c_client *client,
 	return devm_rtc_register_device(priv->rtc);
 }
 
-static const struct i2c_device_id abx80x_id[] = {
-	{ "abx80x", ABX80X },
-	{ "ab0801", AB0801 },
-	{ "ab0803", AB0803 },
-	{ "ab0804", AB0804 },
-	{ "ab0805", AB0805 },
-	{ "ab1801", AB1801 },
-	{ "ab1803", AB1803 },
-	{ "ab1804", AB1804 },
-	{ "ab1805", AB1805 },
-	{ "rv1805", RV1805 },
-	{ }
-};
-MODULE_DEVICE_TABLE(i2c, abx80x_id);
-
 #ifdef CONFIG_OF
 static const struct of_device_id abx80x_of_match[] = {
 	{
@@ -914,7 +915,7 @@ static struct i2c_driver abx80x_driver = {
 		.name	= "rtc-abx80x",
 		.of_match_table = of_match_ptr(abx80x_of_match),
 	},
-	.probe		= abx80x_probe,
+	.probe_new	= abx80x_probe,
 	.id_table	= abx80x_id,
 };
 
diff --git a/drivers/rtc/rtc-at91rm9200.c b/drivers/rtc/rtc-at91rm9200.c
index fe396d27ebb7..e9d17232d0a8 100644
--- a/drivers/rtc/rtc-at91rm9200.c
+++ b/drivers/rtc/rtc-at91rm9200.c
@@ -130,7 +130,7 @@ static void at91_rtc_write_idr(u32 mask)
 	 *
 	 * Note that there is still a possibility that the mask is updated
 	 * before interrupts have actually been disabled in hardware. The only
-	 * way to be certain would be to poll the IMR-register, which is is
+	 * way to be certain would be to poll the IMR-register, which is
 	 * the very register we are trying to emulate. The register read back
 	 * is a reasonable heuristic.
 	 */
diff --git a/drivers/rtc/rtc-bq32k.c b/drivers/rtc/rtc-bq32k.c
index 6d6a55efb9cc..967ddc6bf76d 100644
--- a/drivers/rtc/rtc-bq32k.c
+++ b/drivers/rtc/rtc-bq32k.c
@@ -13,6 +13,7 @@
 #include <linux/i2c.h>
 #include <linux/rtc.h>
 #include <linux/init.h>
+#include <linux/kstrtox.h>
 #include <linux/errno.h>
 #include <linux/bcd.h>
 
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 58cc2bae2f8a..00e2ca7374ec 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -744,6 +744,168 @@ static irqreturn_t cmos_interrupt(int irq, void *p)
 		return IRQ_NONE;
 }
 
+#ifdef	CONFIG_ACPI
+
+#include <linux/acpi.h>
+
+static u32 rtc_handler(void *context)
+{
+	struct device *dev = context;
+	struct cmos_rtc *cmos = dev_get_drvdata(dev);
+	unsigned char rtc_control = 0;
+	unsigned char rtc_intr;
+	unsigned long flags;
+
+
+	/*
+	 * Always update rtc irq when ACPI is used as RTC Alarm.
+	 * Or else, ACPI SCI is enabled during suspend/resume only,
+	 * update rtc irq in that case.
+	 */
+	if (cmos_use_acpi_alarm())
+		cmos_interrupt(0, (void *)cmos->rtc);
+	else {
+		/* Fix me: can we use cmos_interrupt() here as well? */
+		spin_lock_irqsave(&rtc_lock, flags);
+		if (cmos_rtc.suspend_ctrl)
+			rtc_control = CMOS_READ(RTC_CONTROL);
+		if (rtc_control & RTC_AIE) {
+			cmos_rtc.suspend_ctrl &= ~RTC_AIE;
+			CMOS_WRITE(rtc_control, RTC_CONTROL);
+			rtc_intr = CMOS_READ(RTC_INTR_FLAGS);
+			rtc_update_irq(cmos->rtc, 1, rtc_intr);
+		}
+		spin_unlock_irqrestore(&rtc_lock, flags);
+	}
+
+	pm_wakeup_hard_event(dev);
+	acpi_clear_event(ACPI_EVENT_RTC);
+	acpi_disable_event(ACPI_EVENT_RTC, 0);
+	return ACPI_INTERRUPT_HANDLED;
+}
+
+static void acpi_rtc_event_setup(struct device *dev)
+{
+	if (acpi_disabled)
+		return;
+
+	acpi_install_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler, dev);
+	/*
+	 * After the RTC handler is installed, the Fixed_RTC event should
+	 * be disabled. Only when the RTC alarm is set will it be enabled.
+	 */
+	acpi_clear_event(ACPI_EVENT_RTC);
+	acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void acpi_rtc_event_cleanup(void)
+{
+	if (acpi_disabled)
+		return;
+
+	acpi_remove_fixed_event_handler(ACPI_EVENT_RTC, rtc_handler);
+}
+
+static void rtc_wake_on(struct device *dev)
+{
+	acpi_clear_event(ACPI_EVENT_RTC);
+	acpi_enable_event(ACPI_EVENT_RTC, 0);
+}
+
+static void rtc_wake_off(struct device *dev)
+{
+	acpi_disable_event(ACPI_EVENT_RTC, 0);
+}
+
+#ifdef CONFIG_X86
+/* Enable use_acpi_alarm mode for Intel platforms no earlier than 2015 */
+static void use_acpi_alarm_quirks(void)
+{
+	if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+		return;
+
+	if (!is_hpet_enabled())
+		return;
+
+	if (dmi_get_bios_year() < 2015)
+		return;
+
+	use_acpi_alarm = true;
+}
+#else
+static inline void use_acpi_alarm_quirks(void) { }
+#endif
+
+static void acpi_cmos_wake_setup(struct device *dev)
+{
+	if (acpi_disabled)
+		return;
+
+	use_acpi_alarm_quirks();
+
+	cmos_rtc.wake_on = rtc_wake_on;
+	cmos_rtc.wake_off = rtc_wake_off;
+
+	/* ACPI tables bug workaround. */
+	if (acpi_gbl_FADT.month_alarm && !acpi_gbl_FADT.day_alarm) {
+		dev_dbg(dev, "bogus FADT month_alarm (%d)\n",
+			acpi_gbl_FADT.month_alarm);
+		acpi_gbl_FADT.month_alarm = 0;
+	}
+
+	cmos_rtc.day_alrm = acpi_gbl_FADT.day_alarm;
+	cmos_rtc.mon_alrm = acpi_gbl_FADT.month_alarm;
+	cmos_rtc.century = acpi_gbl_FADT.century;
+
+	if (acpi_gbl_FADT.flags & ACPI_FADT_S4_RTC_WAKE)
+		dev_info(dev, "RTC can wake from S4\n");
+
+	/* RTC always wakes from S1/S2/S3, and often S4/STD */
+	device_init_wakeup(dev, 1);
+}
+
+static void cmos_check_acpi_rtc_status(struct device *dev,
+					      unsigned char *rtc_control)
+{
+	struct cmos_rtc *cmos = dev_get_drvdata(dev);
+	acpi_event_status rtc_status;
+	acpi_status status;
+
+	if (acpi_gbl_FADT.flags & ACPI_FADT_FIXED_RTC)
+		return;
+
+	status = acpi_get_event_status(ACPI_EVENT_RTC, &rtc_status);
+	if (ACPI_FAILURE(status)) {
+		dev_err(dev, "Could not get RTC status\n");
+	} else if (rtc_status & ACPI_EVENT_FLAG_SET) {
+		unsig