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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
