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Commit bf2c532b authored by Baolin Wang's avatar Baolin Wang Committed by Alexandre Belloni
Browse files

rtc: sc27xx: Add check to see if need to enable the alarm interrupt 



The RTC interrupt enable register is not put in always-power-on region
supplied by VDDRTC, so we should check if we need enable the alarm
interrupt when system booting.

Signed-off-by: default avatarBaolin Wang <baolin.wang@linaro.org>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent b2ddc485

drivers/rtc/rtc-sc27xx.c

+33 −0
Original line number Diff line number Diff line
@@ -563,6 +563,32 @@ static int sprd_rtc_check_power_down(struct sprd_rtc *rtc) 
	return 0;

}



static int sprd_rtc_check_alarm_int(struct sprd_rtc *rtc)

{

	u32 val;

	int ret;



	ret = regmap_read(rtc->regmap, rtc->base + SPRD_RTC_SPG_VALUE, &val);

	if (ret)

		return ret;



	/*

	 * The SPRD_RTC_INT_EN register is not put in always-power-on region

	 * supplied by VDDRTC, so we should check if we need enable the alarm

	 * interrupt when system booting.

	 *

	 * If we have set SPRD_RTC_POWEROFF_ALM_FLAG which is saved in

	 * always-power-on region, that means we have set one alarm last time,

	 * so we should enable the alarm interrupt to help RTC core to see if

	 * there is an alarm already set in RTC hardware.

	 */

	if (!(val & SPRD_RTC_POWEROFF_ALM_FLAG))

		return 0;



	return regmap_update_bits(rtc->regmap, rtc->base + SPRD_RTC_INT_EN,

				  SPRD_RTC_ALARM_EN, SPRD_RTC_ALARM_EN);

}



static int sprd_rtc_probe(struct platform_device *pdev)

{

	struct device_node *node = pdev->dev.of_node;
@@ -596,6 +622,13 @@ static int sprd_rtc_probe(struct platform_device *pdev) 
	rtc->dev = &pdev->dev;

	platform_set_drvdata(pdev, rtc);



	/* check if we need set the alarm interrupt */

	ret = sprd_rtc_check_alarm_int(rtc);

	if (ret) {

		dev_err(&pdev->dev, "failed to check RTC alarm interrupt\n");

		return ret;

	}



	/* check if RTC time values are valid */

	ret = sprd_rtc_check_power_down(rtc);

	if (ret) {