diff options
| -rw-r--r-- | drivers/rtc/rtc-omap.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index 734e4080473..03bce134414 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) { |