On 11/10/2024 11:22:39-0400, Jonathan Marek wrote:
> 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@xxxxxxxx>
> ---
> 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,
> +};
> +
Please clear the alarm feature flag instead of duplicating the ops
> 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
>
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
