Add external 32k clock feature. The internal clock will be gated during suspend.
Hence make use of the external 32k clock so that rtc is functional accross
suspend/resume.
Signed-off-by: Keerthy <j-keerthy@xxxxxx>
---
Tested on DRA7-EVM.
drivers/rtc/rtc-omap.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 8e5851a..4f803ca 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -107,6 +107,8 @@
/* OMAP_RTC_OSC_REG bit fields: */
#define OMAP_RTC_OSC_32KCLK_EN BIT(6)
+#define OMAP_RTC_OSC_OSC32K_GZ BIT(4)
+#define OMAP_RTC_OSC_EXT_32K BIT(3)
/* OMAP_RTC_IRQWAKEEN bit fields: */
#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1)
@@ -120,6 +122,7 @@
struct omap_rtc_device_type {
bool has_32kclk_en;
+ bool has_osc_ext_32k;
bool has_kicker;
bool has_irqwakeen;
bool has_pmic_mode;
@@ -446,6 +449,7 @@ static const struct omap_rtc_device_type omap_rtc_default_type = {
static const struct omap_rtc_device_type omap_rtc_am3352_type = {
.has_32kclk_en = true,
+ .has_osc_ext_32k = true,
.has_kicker = true,
.has_irqwakeen = true,
.has_pmic_mode = true,
@@ -543,7 +547,16 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
if (rtc->type->has_32kclk_en) {
reg = rtc_read(rtc, OMAP_RTC_OSC_REG);
rtc_writel(rtc, OMAP_RTC_OSC_REG,
- reg | OMAP_RTC_OSC_32KCLK_EN);
+ reg | OMAP_RTC_OSC_32KCLK_EN);
+ }
+
+ /* Enable External clock as the source */
+
+ if (rtc->type->has_osc_ext_32k) {
+ rtc_writel(rtc, OMAP_RTC_OSC_REG,
+ (OMAP_RTC_OSC_EXT_32K |
+ rtc_read(rtc, OMAP_RTC_OSC_REG)) &
+ (~OMAP_RTC_OSC_OSC32K_GZ));
}
/* clear old status */
--
1.9.1
--
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