[v2,4/6] rtc: pm8xxx: implement qcom,no-alarm flag for non-HLOS owned alarm

Commit Message

Johan Hovold Feb. 19, 2025, 1:41 p.m. UTC

From: Jonathan Marek <[e-mail]>

Qualcomm x1e80100 firmware sets the ownership of the RTC alarm to ADSP.
Thus writing to RTC alarm registers and receiving alarm interrupts is not
possible.

Add a qcom,no-alarm flag to support RTC on this platform.

Signed-off-by: Jonathan Marek <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
[ johan: drop no_alarm flag and restructure probe() ]
Tested-by: Jens Glathe <[e-mail]>
Tested-by: Steev Klimaszewski <[e-mail]>
Tested-by: Joel Stanley <[e-mail]>
Tested-by: Sebastian Reichel <[e-mail]> # Lenovo T14s Gen6
Signed-off-by: Johan Hovold <[e-mail]>
---
 drivers/rtc/rtc-pm8xxx.c | 43 ++++++++++++++++++++++------------------
 1 file changed, 24 insertions(+), 19 deletions(-)

Patch

diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index 68140ac39365..14707e21f343 100644
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -606,9 +606,11 @@  static int pm8xxx_rtc_probe(struct platform_device *pdev)
 	if (!rtc_dd->regmap)
 		return -ENXIO;
 
-	rtc_dd->alarm_irq = platform_get_irq(pdev, 0);
-	if (rtc_dd->alarm_irq < 0)
-		return -ENXIO;
+	if (!of_property_read_bool(pdev->dev.of_node, "qcom,no-alarm")) {
+		rtc_dd->alarm_irq = platform_get_irq(pdev, 0);
+		if (rtc_dd->alarm_irq < 0)
+			return -ENXIO;
+	}
 
 	rtc_dd->allow_set_time = of_property_read_bool(pdev->dev.of_node,
 						      "allow-set-time");
@@ -624,8 +626,6 @@  static int pm8xxx_rtc_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, rtc_dd);
 
-	device_init_wakeup(&pdev->dev, true);
-
 	rtc_dd->rtc = devm_rtc_allocate_device(&pdev->dev);
 	if (IS_ERR(rtc_dd->rtc))
 		return PTR_ERR(rtc_dd->rtc);
@@ -633,27 +633,32 @@  static int pm8xxx_rtc_probe(struct platform_device *pdev)
 	rtc_dd->rtc->ops = &pm8xxx_rtc_ops;
 	rtc_dd->rtc->range_max = U32_MAX;
 
-	rc = devm_request_any_context_irq(&pdev->dev, rtc_dd->alarm_irq,
-					  pm8xxx_alarm_trigger,
-					  IRQF_TRIGGER_RISING,
-					  "pm8xxx_rtc_alarm", rtc_dd);
-	if (rc < 0)
-		return rc;
+	if (rtc_dd->alarm_irq) {
+		rc = devm_request_any_context_irq(&pdev->dev, rtc_dd->alarm_irq,
+						  pm8xxx_alarm_trigger,
+						  IRQF_TRIGGER_RISING,
+						  "pm8xxx_rtc_alarm", rtc_dd);
+		if (rc < 0)
+			return rc;
 
-	rc = devm_rtc_register_device(rtc_dd->rtc);
-	if (rc)
-		return rc;
+		rc = dev_pm_set_wake_irq(&pdev->dev, rtc_dd->alarm_irq);
+		if (rc)
+			return rc;
 
-	rc = dev_pm_set_wake_irq(&pdev->dev, rtc_dd->alarm_irq);
-	if (rc)
-		return rc;
+		device_init_wakeup(&pdev->dev, true);
+	} else {
+		clear_bit(RTC_FEATURE_ALARM, rtc_dd->rtc->features);
+	}
 
-	return 0;
+	return devm_rtc_register_device(rtc_dd->rtc);
 }
 
 static void pm8xxx_remove(struct platform_device *pdev)
 {
-	dev_pm_clear_wake_irq(&pdev->dev);
+	struct pm8xxx_rtc *rtc_dd = platform_get_drvdata(pdev);
+
+	if (rtc_dd->alarm_irq)
+		dev_pm_clear_wake_irq(&pdev->dev);
 }
 
 static void pm8xxx_shutdown(struct platform_device *pdev)