Hi Andrew, Apologies for replying late. On Wednesday 25 March 2015 04:29 AM, Andrew Morton wrote:
On Tue, 3 Mar 2015 15:12:02 +0530 Keerthy <j-keerthy@xxxxxx> wrote: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. ... @@ -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)); }How do we know that all systems have this external clock and that it works OK?
AM335 and AM43X have the external clock feature which we choose using RTC_OSC_REG. I verified it works OK by seeing the RTC seconds ticking even after switching the source to the external 32k Clock.
Regards, Keerthy -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
