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

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Date:   Tue, 1 Aug 2023 18:18:46 +0530
From:   Anvesh Jain P <quic_ajainp@...cinc.com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.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

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.

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
>>
>