Based on the board property switch the source from internal
to external clock. Switching to external source is needed for
rtcwake to work in low power modes.
Signed-off-by: Keerthy <j-keerthy@xxxxxx>
---
Documentation/devicetree/bindings/rtc/rtc-omap.txt | 2 ++
drivers/rtc/rtc-omap.c | 10 ++++++++++
2 files changed, 12 insertions(+)
diff --git a/Documentation/devicetree/bindings/rtc/rtc-omap.txt b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
index 4ba4dbd..0c44755 100644
--- a/Documentation/devicetree/bindings/rtc/rtc-omap.txt
+++ b/Documentation/devicetree/bindings/rtc/rtc-omap.txt
@@ -15,6 +15,7 @@ Required properties:
Optional properties:
- system-power-controller: whether the rtc is controlling the system power
through pmic_power_en
+- ext-clk-src: Whether the rtc can be sourced by external clock
Example:
@@ -25,4 +26,5 @@ rtc@1c23000 {
19>;
interrupt-parent = <&intc>;
system-power-controller;
+ ext-clk-src;
};
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 8b6355f..cb8936a 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -107,6 +107,7 @@
/* 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 +137,7 @@ struct omap_rtc {
int irq_timer;
u8 interrupts_reg;
bool is_pmic_controller;
+ bool is_ext_src;
const struct omap_rtc_device_type *type;
};
@@ -540,6 +542,8 @@ static int omap_rtc_probe(struct platform_device *pdev)
rtc->is_pmic_controller = rtc->type->has_pmic_mode &&
of_property_read_bool(pdev->dev.of_node,
"system-power-controller");
+ rtc->is_ext_src = of_property_read_bool(pdev->dev.of_node,
+ "ext-clk-src");
} else {
id_entry = platform_get_device_id(pdev);
rtc->type = (void *)id_entry->driver_data;
@@ -627,6 +631,12 @@ static int omap_rtc_probe(struct platform_device *pdev)
if (reg != new_ctrl)
rtc_write(rtc, OMAP_RTC_CTRL_REG, new_ctrl);
+ if (rtc->is_ext_src) {
+ reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
+ rtc_writel(rtc, OMAP_RTC_OSC_REG,
+ reg | OMAP_RTC_OSC_SEL_32KCLK_SRC);
+ }
+
rtc->type->lock(rtc);
device_init_wakeup(&pdev->dev, true);
--
1.9.1
--
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