diff options
| author | Baolin Wang <baolin.wang@linaro.org> | 2018-10-18 10:52:29 +0200 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-10-25 02:35:40 +0200 |
| commit | bf2c532b67fc077051e17de4a1304a83e5ca5b15 (patch) | |
| tree | 7b6f141c2b99729fd9e0b3884bdf34a6d40fb60f /drivers/rtc | |
| parent | rtc: sc27xx: Remove interrupts disable and clear in probe() (diff) | |
| download | linux-bf2c532b67fc077051e17de4a1304a83e5ca5b15.tar.xz linux-bf2c532b67fc077051e17de4a1304a83e5ca5b15.zip | |
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: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc')
| -rw-r--r-- | drivers/rtc/rtc-sc27xx.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-sc27xx.c b/drivers/rtc/rtc-sc27xx.c index 4ecabe6c9429..72bb002c88ec 100644 --- a/drivers/rtc/rtc-sc27xx.c +++ b/drivers/rtc/rtc-sc27xx.c @@ -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) { |