diff options
Diffstat (limited to 'drivers/rtc/rtc-omap.c')
| -rw-r--r-- | drivers/rtc/rtc-omap.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c index 8b6355ffaff9..ec2e9c5fb993 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) @@ -132,10 +134,12 @@ struct omap_rtc_device_type { struct omap_rtc { struct rtc_device *rtc; void __iomem *base; + struct clk *clk; int irq_alarm; int irq_timer; u8 interrupts_reg; bool is_pmic_controller; + bool has_ext_clk; const struct omap_rtc_device_type *type; }; @@ -553,6 +557,15 @@ static int omap_rtc_probe(struct platform_device *pdev) if (rtc->irq_alarm <= 0) return -ENOENT; + rtc->clk = devm_clk_get(&pdev->dev, "ext-clk"); + if (!IS_ERR(rtc->clk)) + rtc->has_ext_clk = true; + else + rtc->clk = devm_clk_get(&pdev->dev, "int-clk"); + + if (!IS_ERR(rtc->clk)) + clk_prepare_enable(rtc->clk); + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); rtc->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(rtc->base)) @@ -627,6 +640,16 @@ 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 it so we can keep + * ticking across 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 +695,7 @@ err: static int __exit omap_rtc_remove(struct platform_device *pdev) { struct omap_rtc *rtc = platform_get_drvdata(pdev); + u8 reg; if (pm_power_off == omap_rtc_power_off && omap_rtc_power_off_rtc == rtc) { @@ -681,10 +705,19 @@ static int __exit omap_rtc_remove(struct platform_device *pdev) device_init_wakeup(&pdev->dev, 0); + if (!IS_ERR(rtc->clk)) + clk_disable_unprepare(rtc->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 */ |