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Message-ID: <20241011152244.31267-1-jonathan@marek.ca>
Date: Fri, 11 Oct 2024 11:22:39 -0400
From: Jonathan Marek <jonathan@...ek.ca>
To: linux-arm-msm@...r.kernel.org
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>,
linux-rtc@...r.kernel.org (open list:REAL TIME CLOCK (RTC) SUBSYSTEM),
linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 1/5] rtc: pm8xxx: implement no-alarm flag for non-HLOS owned alarm
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 no-alarm flag to support RTC on this platform.
Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
drivers/rtc/rtc-pm8xxx.c | 48 ++++++++++++++++++++++++++++------------
1 file changed, 34 insertions(+), 14 deletions(-)
diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c
index c32fba550c8e0..9240844022092 100644
--- a/drivers/rtc/rtc-pm8xxx.c
+++ b/drivers/rtc/rtc-pm8xxx.c
@@ -61,6 +61,7 @@ struct pm8xxx_rtc {
struct rtc_device *rtc;
struct regmap *regmap;
bool allow_set_time;
+ bool no_alarm;
int alarm_irq;
const struct pm8xxx_rtc_regs *regs;
struct device *dev;
@@ -375,6 +376,11 @@ static const struct rtc_class_ops pm8xxx_rtc_ops = {
.alarm_irq_enable = pm8xxx_rtc_alarm_irq_enable,
};
+static const struct rtc_class_ops pm8xxx_rtc_no_alarm_ops = {
+ .read_time = pm8xxx_rtc_read_time,
+ .set_time = pm8xxx_rtc_set_time,
+};
+
static irqreturn_t pm8xxx_alarm_trigger(int irq, void *dev_id)
{
struct pm8xxx_rtc *rtc_dd = dev_id;
@@ -473,9 +479,13 @@ 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;
+ rtc_dd->no_alarm = of_property_read_bool(pdev->dev.of_node, "no-alarm");
+
+ if (!rtc_dd->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");
@@ -503,7 +513,8 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, rtc_dd);
- device_init_wakeup(&pdev->dev, 1);
+ if (!rtc_dd->no_alarm)
+ device_init_wakeup(&pdev->dev, 1);
rtc_dd->rtc = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(rtc_dd->rtc))
@@ -512,27 +523,36 @@ 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->no_alarm) {
+ 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;
+ } else {
+ rtc_dd->rtc->ops = &pm8xxx_rtc_no_alarm_ops;
+ }
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;
+ if (!rtc_dd->no_alarm) {
+ rc = dev_pm_set_wake_irq(&pdev->dev, rtc_dd->alarm_irq);
+ if (rc)
+ return rc;
+ }
return 0;
}
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->no_alarm)
+ dev_pm_clear_wake_irq(&pdev->dev);
}
static struct platform_driver pm8xxx_rtc_driver = {
--
2.45.1
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