Configure the clock source to external clock if available.
External clock is preferred as it can be ticking during suspend.
Signed-off-by: Keerthy <j-keerthy@xxxxxx>
---
drivers/rtc/rtc-omap.c | 33 ++++++++++++++++++++++++++++++---
1 file changed, 30 insertions(+), 3 deletions(-)
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index f31c012..255f7b7 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -108,6 +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)
@@ -138,6 +139,7 @@ struct omap_rtc {
int irq_timer;
u8 interrupts_reg;
bool is_pmic_controller;
+ bool has_ext_clk;
const struct omap_rtc_device_type *type;
};
@@ -555,11 +557,19 @@ static int omap_rtc_probe(struct platform_device *pdev)
if (rtc->irq_alarm <= 0)
return -ENOENT;
- rtc->clk = devm_clk_get(&pdev->dev, "int-clk");
-
- if (!IS_ERR(rtc->clk))
+ rtc->clk = devm_clk_get(&pdev->dev, "ext-clk");
+ if (!IS_ERR(rtc->clk)) {
+ rtc->has_ext_clk = true;
clk_prepare_enable(rtc->clk);
+ } else {
+ rtc->clk = devm_clk_get(&pdev->dev, "int-clk");
+ if (IS_ERR(rtc->clk))
+ goto no_clk;
+ }
+ clk_prepare_enable(rtc->clk);
+
+no_clk:
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
rtc->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(rtc->base))
@@ -634,6 +644,16 @@ static int omap_rtc_probe(struct platform_device *pdev)
if (reg != new_ctrl)
rtc_write(rtc, OMAP_RTC_CTRL_REG, new_ctrl);
+ /*
+ * If we have the external clock then switch to it so we can keep
+ * ticking across 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);
device_init_wakeup(&pdev->dev, true);
@@ -679,6 +699,7 @@ err:
static int __exit omap_rtc_remove(struct platform_device *pdev)
{
struct omap_rtc *rtc = platform_get_drvdata(pdev);
+ u8 reg;
if (pm_power_off == omap_rtc_power_off &&
omap_rtc_power_off_rtc == rtc) {
@@ -695,6 +716,12 @@ static int __exit omap_rtc_remove(struct platform_device *pdev)
/* leave rtc running, but disable irqs */
rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0);
+ 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);
/* Disable the clock/module */
--
1.9.1
--
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