Configure the clock source to either internal clock or external clock based on the availability of the clocks. External clock is preferred as it can be ticking during suspend.
Signed-off-by: Keerthy <[email protected]> --- drivers/rtc/rtc-omap.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index 8b6355f..479f730 100644 --- a/drivers/rtc/rtc-omap.c +++ b/drivers/rtc/rtc-omap.c @@ -25,6 +25,7 @@ #include <linux/of_device.h> #include <linux/pm_runtime.h> #include <linux/io.h> +#include <linux/clk.h> /* * The OMAP RTC is a year/month/day/hours/minutes/seconds BCD clock @@ -107,6 +108,7 @@ /* OMAP_RTC_OSC_REG bit fields: */ #define OMAP_RTC_OSC_32KCLK_EN BIT(6) +#define OMAP_RTC_OSC_SEL_32KCLK_SRC BIT(3) /* OMAP_RTC_IRQWAKEEN bit fields: */ #define OMAP_RTC_IRQWAKEEN_ALARM_WAKEEN BIT(1) @@ -136,6 +138,7 @@ struct omap_rtc { int irq_timer; u8 interrupts_reg; bool is_pmic_controller; + bool has_ext_clk; const struct omap_rtc_device_type *type; }; @@ -525,6 +528,7 @@ static int omap_rtc_probe(struct platform_device *pdev) { struct omap_rtc *rtc; struct resource *res; + struct clk *ext_clk, *int_clk; u8 reg, mask, new_ctrl; const struct platform_device_id *id_entry; const struct of_device_id *of_id; @@ -553,6 +557,17 @@ static int omap_rtc_probe(struct platform_device *pdev) if (rtc->irq_alarm <= 0) return -ENOENT; + ext_clk = devm_clk_get(&pdev->dev, "ext-clk"); + if (!IS_ERR(ext_clk)) { + rtc->has_ext_clk = true; + clk_prepare(ext_clk); + } else { + int_clk = devm_clk_get(&pdev->dev, "int-clk"); + + if (!IS_ERR(int_clk)) + clk_prepare(int_clk); + } + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); rtc->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(rtc->base)) @@ -627,6 +642,17 @@ static int omap_rtc_probe(struct platform_device *pdev) if (reg != new_ctrl) rtc_write(rtc, OMAP_RTC_CTRL_REG, new_ctrl); + /* + * If we have the external clock then + * Switch to external clock so we can keep ticking + * acorss suspend + */ + if (rtc->has_ext_clk) { + reg = rtc_read(rtc, OMAP_RTC_OSC_REG); + rtc_write(rtc, OMAP_RTC_OSC_REG, reg | + OMAP_RTC_OSC_SEL_32KCLK_SRC); + } + rtc->type->lock(rtc); device_init_wakeup(&pdev->dev, true); @@ -672,6 +698,8 @@ err: static int __exit omap_rtc_remove(struct platform_device *pdev) { struct omap_rtc *rtc = platform_get_drvdata(pdev); + struct clk *ext_clk, *int_clk; + u8 reg; if (pm_power_off == omap_rtc_power_off && omap_rtc_power_off_rtc == rtc) { @@ -681,10 +709,26 @@ static int __exit omap_rtc_remove(struct platform_device *pdev) device_init_wakeup(&pdev->dev, 0); + ext_clk = devm_clk_get(&pdev->dev, "ext-clk"); + if (!IS_ERR(ext_clk)) { + clk_unprepare(ext_clk); + } else { + int_clk = devm_clk_get(&pdev->dev, "int-clk"); + + if (!IS_ERR(int_clk)) + clk_unprepare(int_clk); + } + rtc->type->unlock(rtc); /* leave rtc running, but disable irqs */ rtc_write(rtc, OMAP_RTC_INTERRUPTS_REG, 0); + if (rtc->has_ext_clk) { + reg = rtc_read(rtc, OMAP_RTC_OSC_REG); + reg &= ~OMAP_RTC_OSC_SEL_32KCLK_SRC; + rtc_write(rtc, OMAP_RTC_OSC_REG, reg); + } + rtc->type->lock(rtc); /* Disable the clock/module */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
