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SubjectRe: [PATCH v2 2/3] dt-bindings: watchdog: fsl-imx: document suspend in wait mode
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On 26. 10. 22 16:12, Krzysztof Kozlowski wrote:
> On 26/10/2022 02:38, Andrej Picej wrote:
>> On 25. 10. 22 15:48, Krzysztof Kozlowski wrote:
>>> On 25/10/2022 03:25, Andrej Picej wrote:
>>>> Property "fsl,suspend-in-wait" suspends watchdog in "WAIT" mode which
>>>> corresponds to Linux's Suspend-to-Idle S0 mode. If this property is not
>>>> set and the device is put into Suspend-to-Idle mode, the watchdog
>>>> triggers a reset after 128 seconds.
>>>>
>>>> Signed-off-by: Andrej Picej <andrej.picej@norik.com>
>>>> Reviewed-by: Fabio Estevam <festevam@gmail.com>
>>>> ---
>>>> Changes in v2:
>>>> - add a commit message,
>>>> - add a list of devices which support this functionality
>>>> ---
>>>> .../bindings/watchdog/fsl-imx-wdt.yaml | 22 +++++++++++++++++++
>>>> 1 file changed, 22 insertions(+)
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
>>>> index fb7695515be1..9289de97859b 100644
>>>> --- a/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
>>>> +++ b/Documentation/devicetree/bindings/watchdog/fsl-imx-wdt.yaml
>>>> @@ -55,6 +55,28 @@ properties:
>>>> If present, the watchdog device is configured to assert its
>>>> external reset (WDOG_B) instead of issuing a software reset.
>>>>
>>>> + fsl,suspend-in-wait:
>>>> + $ref: /schemas/types.yaml#/definitions/flag
>>>> + description: |
>>>> + If present, the watchdog device is suspended in WAIT mode
>>>> + (Suspend-to-Idle). Only supported on following devices:
>>>> + - "fsl,imx25-wdt",
>>>
>>> You need to define such allow/disallow in allOf:if:then, instead. Like
>>> example-schema is doing for foo-supply, just disallow it for some types
>>> or use "if: not: ..."
>>
>> Sorry missed that. So something like that should be added?:
>>
>>> allOf:
>>> - if:
>>> not:
>>> properties:
>>> compatible:
>>> contains:
>>> enum:
>>> - fsl,imx25-wdt
>>> - fsl,imx35-wdt
>>> - fsl,imx50-wdt
>>> - fsl,imx51-wdt
>>> - fsl,imx53-wdt
>>> - fsl,imx6q-wdt
>>> - fsl,imx6sl-wdt
>>> - fsl,imx6sll-wdt
>>> - fsl,imx6sx-wdt
>>> - fsl,imx6ul-wdt
>>> - fsl,imx7d-wdt
>>> - fsl,imx8mm-wdt
>>> - fsl,imx8mn-wdt
>>> - fsl,imx8mp-wdt
>>> - fsl,imx8mq-wdt
>>> - fsl,vf610-wdt
>
> Yes.
>
>>> then:
>>> properties:
>>> fsl,suspend-in-wait: false
>>
>> And I'm assuming I can then remove the supported devices list from
>> property description.
>
> Yes.
>
>>
>> Are you fine with this, so we don't have to split the compatible list
>> like Alexander suggested? Basically we have the same list of WDW
>> supported devices in the driver.
>
> I don't know to what you refer.
>
I'm referring to this comment by Alexander Stein:
(https://lore.kernel.org/all/13126397.uLZWGnKmhe@steina-w/)

> So the models listed in Documentation/devicetree/bindings/watchdog/fsl-imx-
> wdt.yaml not supporting this feature are
> * fsl,imx21-wdt
> * fsl,imx27-wdt
> * fsl,imx31-wdt
> * fsl,ls1012a-wdt
> * fsl,ls1043a-wdt
> ?
>
> But all models are listed as compatible to fsl,imx21-wdt. So there is
> something wrong here. IMHO this sounds like the compatible list has to be
> split and updated. Depending on that this feature can be detected. Maintaining
> another list seems error prone to me.

Best regards,
Andrej.

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