[PATCH] rtc: amlogic-a4: clear unsupported update interrupt feature

[Xianwei Zhao]

Hi Alexandre,
    Thanks for your review.

On 2026/8/19 21:36, Alexandre Belloni wrote:
> Hello,
> 
> On 24/06/2026 07:24:34+0000, Xianwei Zhao via B4 Relay wrote:
>> From: Xianwei Zhao<xianwei.zhao at amlogic.com>
>>
>> The Amlogic A4 RTC does not support update interrupt. Clear
>> RTC_FEATURE_UPDATE_INTERRUPT before registering the RTC device to
>> prevent userspace from enabling an unsupported RTC UIE function.
>>
> Because the driver supports alarms, it should support UIE. Is there any
> reason the RTC can't handle arming alarms every seconds?
> There are some that would only support alarms avery 2s, in that case,
> please set RTC_FEATURE_ALARM_RES_2S.
> 

Got it, Amlogic RTC support every seconds. Please ignore this patch.

>> Signed-off-by: Xianwei Zhao<xianwei.zhao at amlogic.com>
>> ---
>> Clear RTC_FEATURE_UPDATE_INTERRUPT before registering the RTC device.
>> ---
>>   drivers/rtc/rtc-amlogic-a4.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/rtc/rtc-amlogic-a4.c b/drivers/rtc/rtc-amlogic-a4.c
>> index 50938c35af36..116cf095a9e9 100644
>> --- a/drivers/rtc/rtc-amlogic-a4.c
>> +++ b/drivers/rtc/rtc-amlogic-a4.c
>> @@ -379,6 +379,7 @@ static int aml_rtc_probe(struct platform_device *pdev)
>>        rtc->rtc_dev->ops = &aml_rtc_ops;
>>        rtc->rtc_dev->range_min = 0;
>>        rtc->rtc_dev->range_max = U32_MAX;
>> +     clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc->rtc_dev->features);
>>
>>        return devm_rtc_register_device(rtc->rtc_dev);
>>   }
>>
>> ---
>> base-commit: 851d961ff248218f681c53cf0f7f08cf8201a117
>> change-id: 20260624-rtc-feature-03ce3f3843a9
>>
>> Best regards,
>> --
>> Xianwei Zhao<xianwei.zhao at amlogic.com>