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-rw-r--r--drivers/rtc/rtc-omap.c16
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 734e40804732..03bce134414c 100644
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -96,6 +96,9 @@
#define OMAP_RTC_INTERRUPTS_IT_ALARM BIT(3)
#define OMAP_RTC_INTERRUPTS_IT_TIMER BIT(2)
+/* OMAP_RTC_OSC_REG bit fields: */
+#define OMAP_RTC_OSC_32KCLK_EN BIT(6)
+
/* OMAP_RTC_IRQWAKEEN bit fields: */
#define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1)
@@ -111,6 +114,12 @@
*/
#define OMAP_RTC_HAS_IRQWAKEEN BIT(1)
+/*
+ * Some RTC IP revisions (like those in AM335x and DRA7x) need
+ * the 32KHz clock to be explicitly enabled.
+ */
+#define OMAP_RTC_HAS_32KCLK_EN BIT(2)
+
static void __iomem *rtc_base;
#define rtc_read(addr) readb(rtc_base + (addr))
@@ -319,7 +328,8 @@ static struct platform_device_id omap_rtc_devtype[] = {
},
[OMAP_RTC_DATA_AM3352_IDX] = {
.name = "am3352-rtc",
- .driver_data = OMAP_RTC_HAS_KICKER | OMAP_RTC_HAS_IRQWAKEEN,
+ .driver_data = OMAP_RTC_HAS_KICKER | OMAP_RTC_HAS_IRQWAKEEN |
+ OMAP_RTC_HAS_32KCLK_EN,
},
[OMAP_RTC_DATA_DA830_IDX] = {
.name = "da830-rtc",
@@ -398,6 +408,10 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
*/
rtc_write(0, OMAP_RTC_INTERRUPTS_REG);
+ /* enable RTC functional clock */
+ if (id_entry->driver_data & OMAP_RTC_HAS_32KCLK_EN)
+ rtc_writel(OMAP_RTC_OSC_32KCLK_EN, OMAP_RTC_OSC_REG);
+
/* clear old status */
reg = rtc_read(OMAP_RTC_STATUS_REG);
if (reg & (u8) OMAP_RTC_STATUS_POWER_UP) {
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