linux-kernel - Re: [PATCH] rtc: rtc-pm8xxx: control default alarm wake up capability

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Message-ID: <202308011934080c7083b9@mail.local>
Date:   Tue, 1 Aug 2023 21:34:08 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Anvesh Jain P <quic_ajainp@...cinc.com>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>, linux-rtc@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Venkata Rao Kakani <quic_vkakani@...cinc.com>
Subject: Re: [PATCH] rtc: rtc-pm8xxx: control default alarm wake up capability

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.

> 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@...cinc.com>
> > > Signed-off-by: Anvesh Jain P <quic_ajainp@...cinc.com>
> > > ---
> > >   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