* [PATCH] drivers: rtc: rv3028: check and update PORF flag during probe
@ 2024-03-29 10:19 Karthikeyan Krishnasamy
2024-03-29 10:28 ` Alexandre Belloni
0 siblings, 1 reply; 3+ messages in thread
From: Karthikeyan Krishnasamy @ 2024-03-29 10:19 UTC (permalink / raw)
To: alexandre.belloni
Cc: linux-rtc, linux-kernel, parthiban, saravanan, Karthikeyan Krishnasamy
PORF flag is set during power reset and voltage drop below Vpor
data in rtc device is no longer valid if PORF flag is set
and software must reset to 0, in order to perform sanity
check on rtc data
Signed-off-by: Karthikeyan Krishnasamy <karthikeyan@linumiz.com>
---
drivers/rtc/rtc-rv3028.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/rtc/rtc-rv3028.c b/drivers/rtc/rtc-rv3028.c
index 2f001c59c61d..e9699ff0c4e8 100644
--- a/drivers/rtc/rtc-rv3028.c
+++ b/drivers/rtc/rtc-rv3028.c
@@ -951,6 +951,13 @@ static int rv3028_probe(struct i2c_client *client)
if (ret < 0)
return ret;
+ if (status & RV3028_STATUS_PORF) {
+ ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
+ RV3028_STATUS_PORF, 0);
+ if (ret < 0)
+ return ret;
+ }
+
if (status & RV3028_STATUS_AF)
dev_warn(&client->dev, "An alarm may have been missed.\n");
--
2.34.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] drivers: rtc: rv3028: check and update PORF flag during probe
2024-03-29 10:19 [PATCH] drivers: rtc: rv3028: check and update PORF flag during probe Karthikeyan Krishnasamy
@ 2024-03-29 10:28 ` Alexandre Belloni
2024-03-29 16:03 ` karthikeyan
0 siblings, 1 reply; 3+ messages in thread
From: Alexandre Belloni @ 2024-03-29 10:28 UTC (permalink / raw)
To: Karthikeyan Krishnasamy; +Cc: linux-rtc, linux-kernel, parthiban, saravanan
On 29/03/2024 15:49:40+0530, Karthikeyan Krishnasamy wrote:
> PORF flag is set during power reset and voltage drop below Vpor
> data in rtc device is no longer valid if PORF flag is set
> and software must reset to 0, in order to perform sanity
> check on rtc data
>
> Signed-off-by: Karthikeyan Krishnasamy <karthikeyan@linumiz.com>
> ---
> drivers/rtc/rtc-rv3028.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/drivers/rtc/rtc-rv3028.c b/drivers/rtc/rtc-rv3028.c
> index 2f001c59c61d..e9699ff0c4e8 100644
> --- a/drivers/rtc/rtc-rv3028.c
> +++ b/drivers/rtc/rtc-rv3028.c
> @@ -951,6 +951,13 @@ static int rv3028_probe(struct i2c_client *client)
> if (ret < 0)
> return ret;
>
> + if (status & RV3028_STATUS_PORF) {
> + ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
> + RV3028_STATUS_PORF, 0);
> + if (ret < 0)
> + return ret;
> + }
> +
This breaks the workflow, you must set the time to reset PORF.
> if (status & RV3028_STATUS_AF)
> dev_warn(&client->dev, "An alarm may have been missed.\n");
>
> --
> 2.34.1
>
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drivers: rtc: rv3028: check and update PORF flag during probe
2024-03-29 10:28 ` Alexandre Belloni
@ 2024-03-29 16:03 ` karthikeyan
0 siblings, 0 replies; 3+ messages in thread
From: karthikeyan @ 2024-03-29 16:03 UTC (permalink / raw)
To: Alexandre Belloni; +Cc: linux-rtc, linux-kernel, parthiban, saravanan
Agreed. Thanks for clarification.
Regards,
Karthikeyan Krishnasamy
On 3/29/24 15:58, Alexandre Belloni wrote:
> On 29/03/2024 15:49:40+0530, Karthikeyan Krishnasamy wrote:
>> PORF flag is set during power reset and voltage drop below Vpor
>> data in rtc device is no longer valid if PORF flag is set
>> and software must reset to 0, in order to perform sanity
>> check on rtc data
>>
>> Signed-off-by: Karthikeyan Krishnasamy <karthikeyan@linumiz.com>
>> ---
>> drivers/rtc/rtc-rv3028.c | 7 +++++++
>> 1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/rtc/rtc-rv3028.c b/drivers/rtc/rtc-rv3028.c
>> index 2f001c59c61d..e9699ff0c4e8 100644
>> --- a/drivers/rtc/rtc-rv3028.c
>> +++ b/drivers/rtc/rtc-rv3028.c
>> @@ -951,6 +951,13 @@ static int rv3028_probe(struct i2c_client *client)
>> if (ret < 0)
>> return ret;
>>
>> + if (status & RV3028_STATUS_PORF) {
>> + ret = regmap_update_bits(rv3028->regmap, RV3028_STATUS,
>> + RV3028_STATUS_PORF, 0);
>> + if (ret < 0)
>> + return ret;
>> + }
>> +
>
> This breaks the workflow, you must set the time to reset PORF.
>
>> if (status & RV3028_STATUS_AF)
>> dev_warn(&client->dev, "An alarm may have been missed.\n");
>>
>> --
>> 2.34.1
>>
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2024-03-29 16:04 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2024-03-29 10:19 [PATCH] drivers: rtc: rv3028: check and update PORF flag during probe Karthikeyan Krishnasamy
2024-03-29 10:28 ` Alexandre Belloni
2024-03-29 16:03 ` karthikeyan
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