@@ -336,6 +336,8 @@
 			interrupts = <GIC_SPI 75 IRQ_TYPE_LEVEL_HIGH
 				      GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>;
 			ti,hwmods = "rtc";
+			clocks = <&clk_32768_ck>, <&clk_32k_rtc>;
+			clock-names = "int-clk", "ext-clk";
 			status = "disabled";
 		};
 

@@ -25,6 +25,7 @@
 #include <linux/of_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/io.h>
+#include <linux/clk.h>
 
 /*
  * The OMAP RTC is a year/month/day/hours/minutes/seconds BCD clock

@@ -107,6 +108,7 @@
 
 /* OMAP_RTC_OSC_REG bit fields: */
 #define OMAP_RTC_OSC_32KCLK_EN		BIT(6)
+#define OMAP_RTC_OSC_SEL_32KCLK_SRC	BIT(3)
 
 /* OMAP_RTC_IRQWAKEEN bit fields: */
 #define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN	BIT(1)

@@ -136,6 +138,7 @@ struct omap_rtc {
 	int irq_timer;
 	u8 interrupts_reg;
 	bool is_pmic_controller;
+	bool has_ext_clk;
 	const struct omap_rtc_device_type *type;
 };
 

@@ -525,6 +528,7 @@ static int omap_rtc_probe(struct platform_device *pdev)
 {
 	struct omap_rtc	*rtc;
 	struct resource	*res;
+	struct clk *ext_clk;
 	u8 reg, mask, new_ctrl;
 	const struct platform_device_id *id_entry;
 	const struct of_device_id *of_id;

@@ -553,6 +557,10 @@ static int omap_rtc_probe(struct platform_device *pdev)
 	if (rtc->irq_alarm <= 0)
 		return -ENOENT;
 
+	ext_clk = devm_clk_get(&pdev->dev, "ext-clk");
+	if (!IS_ERR(ext_clk))
+		rtc->has_ext_clk = true;
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	rtc->base = devm_ioremap_resource(&pdev->dev, res);
 	if (IS_ERR(rtc->base))

@@ -698,6 +706,7 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
 static int omap_rtc_suspend(struct device *dev)
 {
 	struct omap_rtc *rtc = dev_get_drvdata(dev);
+	u8 reg;
 
 	rtc->interrupts_reg = rtc_read(rtc, OMAP_RTC_INTERRUPTS_REG);
 

@@ -711,6 +720,18 @@ static int omap_rtc_suspend(struct device *dev)
 		enable_irq_wake(rtc->irq_alarm);
 	else
 		rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
+
+	/*
+	 * If we have the luxury of external clock then
+	 * Switch to external clock so we can keep ticking
+	 * acorss suspend
+	 */
+	if (rtc->has_ext_clk) {
+		reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
+		rtc_write(rtc, OMAP_RTC_OSC_REG, reg |
+			  OMAP_RTC_OSC_SEL_32KCLK_SRC);
+	}
+
 	rtc->type->lock(rtc);
 
 	/* Disable the clock/module */

@@ -722,6 +743,7 @@ static int omap_rtc_suspend(struct device *dev)
 static int omap_rtc_resume(struct device *dev)
 {
 	struct omap_rtc *rtc = dev_get_drvdata(dev);
+	u8 reg;
 
 	/* Enable the clock/module so that we can access the registers */
 	pm_runtime_get_sync(dev);

@@ -731,6 +753,15 @@ static int omap_rtc_resume(struct device *dev)
 		disable_irq_wake(rtc->irq_alarm);
 	else
 		rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, rtc->interrupts_reg);
+	/*
+	 * Switch back to internal source
+	 */
+	if (rtc->has_ext_clk) {
+		reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
+		reg &= ~OMAP_RTC_OSC_SEL_32KCLK_SRC;
+		rtc_write(rtc, OMAP_RTC_OSC_REG, reg);
+	}
+
 	rtc->type->lock(rtc);
 
 	return 0;