On 19/12/2024 11:06, Lad, Prabhakar wrote:
>>> To facilitate this operation, add `renesas,r9a09g057-syscon-wdt-errorrst`
>>> property to the WDT node, which maps to the `syscon` CPG node, enabling
>>> retrieval of the necessary information. For example:
>>>
>>> wdt1: watchdog@14400000 {
>>> compatible = "renesas,r9a09g057-wdt";
>>> renesas,r9a09g057-syscon-wdt-errorrst = <&cpg 0xb40 1>;
>>> ...
>>
>> Drop, obvious.
>>
> Ok.
>
>>> };
>>>
>>> The `renesas,r9a09g057-syscon-wdt-errorrst` property consists of three
>>> cells:
>>> 1. The first cell is a phandle to the CPG node.
>>> 2. The second cell specifies the offset of the CPG_ERROR_RSTm register
>>> within the SYSCON.
>>> 3. The third cell indicates the specific bit within the CPG_ERROR_RSTm
>>> register.
>>
>> Don't describe the contents of patch. Drop paragraph. There is no need
>> to make commit msg unnecessary long. Focus on explaining unknown parts
>> of commit: why? or who is affected by ABI break? why breaking ABI?
>> instead of repeating diff.
>>
> Ok, I'll drop the para. There isnt any ABI breakage as the driver
> patch [0] will skip supporting watchdog bootstatus if this property is
> not present.
>
> [0] https://lore.kernel.org/all/20241218003414.490498-6-prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx/
Really? I see in rzv2h_wdt_probe():
+ if (ret)
+ return ret;
so to me you are failing the probe, not skipping anything.
>
>>>
>>> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
>>> ---
>>> .../bindings/watchdog/renesas,wdt.yaml | 17 +++++++++++++++++
>>> 1 file changed, 17 insertions(+)
>>>
>>> diff --git a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
>>> index 29ada89fdcdc..8d29f5f1be7e 100644
>>> --- a/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
>>> +++ b/Documentation/devicetree/bindings/watchdog/renesas,wdt.yaml
>>> @@ -112,6 +112,19 @@ properties:
>>>
>>> timeout-sec: true
>>>
>>> + renesas,r9a09g057-syscon-wdt-errorrst:
>>
>> There are never, *never* SoC names in property names, because we want
>> properties to be re-usable.
>>
> I should have mentioned this in my commit message (my bad). The
> renesas,wdt.yaml binding file is being used for all the SoCs
> currently. To avoid any conflicts by just having vendor specific
> property I added SoC name to the preoperty.
I know what you did and I replied: that's a no go for reasons I stated.
>
> @Geert/Wolfram - Maybe we need to split the binding on per SoC bases?
You can but I don't understand why exactly.
>
>> Make the property generic for all your devices and be sure to disallow
>> it everywhere the CPG_ERROR_RSTm *does not* exist (which is different
>> from "where CPG_ERROR_RSTm is not used by watchdog driver").
>>
> This patch already disallows `renesas,r9a09g057-syscon-wdt-errorrst`
> for the rest of the SoCs and only allows for RZ/V2H(P) SoC or am I
> missing something?
No, that's fine, but to avoid disallowing it for others you named it per
SoC.
>
>>> + $ref: /schemas/types.yaml#/definitions/phandle-array
>>> + description:
>>> + The first cell is a phandle to the SYSCON entry required to obtain
>>> + the current boot status. The second cell specifies the CPG_ERROR_RSTm
>>> + register offset within the SYSCON, and the third cell indicates the
>>> + bit within the CPG_ERROR_RSTm register.
>>> + items:
>>> + - items:
>>> + - description: Phandle to the CPG node
>>> + - description: The CPG_ERROR_RSTm register offset
>>> + - description: The bit within CPG_ERROR_RSTm register of interest
>>> +
>>> required:
>>> - compatible
>>> - reg
>>> @@ -182,7 +195,11 @@ allOf:
>>> properties:
>>> interrupts: false
>>> interrupt-names: false
>>> + required:
>>> + - renesas,r9a09g057-syscon-wdt-errorrst
>>
>> No, ABI break.
>>
> As mentioned above we won't break ABI, this required flag is for future changes.
Then why is this required? Or at least explain this in the commit msg.
Best regards,
Krzysztof
