On 03/08/2023 19:01:51+0530, Anvesh Jain P wrote: > > > On 8/2/2023 1:04 AM, Alexandre Belloni wrote: > > On 01/08/2023 18:18:46+0530, Anvesh Jain P wrote: > > > In automotive systems, RTC should not wake up the device when it is parked > > > or when it is garage to avoid leakage current. providing a control from > > > device tree to avoid RTC wake up based on the use case is reason for this > > > patch. > > > > > > > Then simply avoid providing an IRQ or setting an alarm. > The purpose of the change is just to block alarms/notifications waking up > the target when it is in Suspend2ram(low power) mode. > if we disable IRQ, alarms/notifications won't come even when the target is > in active mode. > This change will just stop the wake up capability of the alarm when target > is in suspend 2 ram mode based on flag passed from device tree. > Use case of this patch is, > In mobile targets where alarms / notifications will need to wake up the > target when there is a reminder as per user expectation. > where as in automotive targets, when driver is not in Car and target is in > suspend state, alarms/notifications would have no meaning and waking up the > target of no use as there is no user to attend the message. hence blocking > them in automotive use cases based on device tree is the use of this patch. Simply remove the alarm before going to suspend, this is a userspace policy, it has nothing to do in the device or kernel. > > > > > On 8/1/2023 6:10 PM, Alexandre Belloni wrote: > > > > On 01/08/2023 17:15:49+0530, Anvesh Jain P wrote: > > > > > Enable & disable rtc alarm wake up capability based on > > > > > default parameter passed from device tree. > > > > > > > > > > > > > I see what you are doing but not why this is necessary, NAK. > > > > > > > > > Signed-off-by: Venkata Rao Kakani <quic_vkakani@xxxxxxxxxxx> > > > > > Signed-off-by: Anvesh Jain P <quic_ajainp@xxxxxxxxxxx> > > > > > --- > > > > > drivers/rtc/rtc-pm8xxx.c | 3 +++ > > > > > 1 file changed, 3 insertions(+) > > > > > > > > > > diff --git a/drivers/rtc/rtc-pm8xxx.c b/drivers/rtc/rtc-pm8xxx.c > > > > > index f6b779c12ca7..bed57be602b6 100644 > > > > > --- a/drivers/rtc/rtc-pm8xxx.c > > > > > +++ b/drivers/rtc/rtc-pm8xxx.c > > > > > @@ -523,6 +523,9 @@ static int pm8xxx_rtc_probe(struct platform_device *pdev) > > > > > if (rc) > > > > > return rc; > > > > > + if (of_property_read_bool(pdev->dev.of_node, "disable-alarm-wakeup")) > > > > > + device_set_wakeup_capable(&pdev->dev, false); > > > > > + > > > > > rc = dev_pm_set_wake_irq(&pdev->dev, rtc_dd->alarm_irq); > > > > > if (rc) > > > > > return rc; > > > > > > > > > > base-commit: 0a8db05b571ad5b8d5c8774a004c0424260a90bd > > > > > -- > > > > > 2.17.1 > > > > > > > > > > > -- Alexandre Belloni, co-owner and COO, Bootlin Embedded Linux and Kernel engineering https://bootlin.com
