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SubjectRe: [PATCH 2/6] dt-bindings: rtc: stm32: add alarm A out property to select output
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Hi Alexandre,

On 5/4/22 22:27, Alexandre Belloni wrote:
> Hello,
>
> On 04/05/2022 15:06:13+0200, Valentin Caron wrote:
>> STM32 RTC can pulse some SOC pins when an alarm of RTC expires.
>>
>> This patch adds property to activate alarm A output. The pulse can
>> output on three pins RTC_OUT1, RTC_OUT2, RTC_OUT2_RMP
>> (PC13, PB2, PI8 on stm32mp15) (PC13, PB2, PI1 on stm32mp13).
>>
>> Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
>> ---
>> .../devicetree/bindings/rtc/st,stm32-rtc.yaml | 19 ++++++++++++++++++-
>> 1 file changed, 18 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
>> index 56d46ea35c5d..71e02604e8de 100644
>> --- a/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
>> +++ b/Documentation/devicetree/bindings/rtc/st,stm32-rtc.yaml
>> @@ -59,6 +59,13 @@ properties:
>> Refer to <include/dt-bindings/rtc/rtc-stm32.h> for the supported values.
>> Pinctrl state named "default" may be defined to reserve pin for RTC output.
>>
>> + st,alarm:
>> + $ref: "/schemas/types.yaml#/definitions/uint32"
>> + description: |
>> + To select and enable RTC Alarm A output.
>> + Refer to <include/dt-bindings/rtc/rtc-stm32.h> for the supported values.
>> + Pinctrl state named "default" may be defined to reserve pin for RTC output.
>> +
>> allOf:
>> - if:
>> properties:
>> @@ -75,6 +82,9 @@ allOf:
>> st,lsco:
>> maxItems: 0
>>
>> + st,alarm:
>> + maxItems: 0
>> +
>> clock-names: false
>>
>> required:
>> @@ -95,6 +105,9 @@ allOf:
>> st,lsco:
>> maxItems: 0
>>
>> + st,alarm:
>> + maxItems: 0
>> +
>> required:
>> - clock-names
>> - st,syscfg
>> @@ -117,6 +130,9 @@ allOf:
>> st,lsco:
>> maxItems: 1
>>
>> + st,alarm:
>> + maxItems: 1
>> +
>> required:
>> - clock-names
>>
>> @@ -153,8 +169,9 @@ examples:
>> clocks = <&rcc RTCAPB>, <&rcc RTC>;
>> clock-names = "pclk", "rtc_ck";
>> interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
>> + st,alarm = <RTC_OUT1>;
>> st,lsco = <RTC_OUT2_RMP>;
> Shouldn't that be exactly the opposite? You have two pins that can
> output different functions. The property should be the pin and the value
> the function. I'd go even further and I would say this is actually
> pinmuxing.
>
You're right, if the property is the pin and the value the function,
this looks like a pinctrl node.
We choose to develop theses functionalities in the reverse order, to
avoid the complexity of adding
the pinctrl framework to our driver. Moreover, LSCO and AlarmA may
haven't a peripheral client and
this would probably require to also implement pinctrl hogging.

Is the implementation that we have proposed is acceptable regarding
theses elements ?

Thank you,
Valentin

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