[PATCH] dt-bindings: rtc: zynqmp: Describe power-domains property

[Krzysztof Kozlowski]

On 19/02/2024 14:11, Michal Simek wrote:
> 
> 
> On 2/17/24 09:26, Krzysztof Kozlowski wrote:
>> On 16/02/2024 10:42, Michal Simek wrote:
>>>
>>>
>>> On 2/16/24 10:19, Krzysztof Kozlowski wrote:
>>>> On 16/02/2024 09:51, Michal Simek wrote:
>>>>> RTC has its own power domain on Xilinx Versal SOC that's why describe it as
>>>>> optional property.
>>>>>
>>>>> Signed-off-by: Michal Simek <michal.simek at amd.com>
>>>>> ---
>>>>>
>>>>>    Documentation/devicetree/bindings/rtc/xlnx,zynqmp-rtc.yaml | 3 +++
>>>>>    1 file changed, 3 insertions(+)
>>>>>
>>>>
>>>> But Versal is not described in this binding, is it? I see only one
>>>> compatible.
>>>
>>> It is the same IP only as is on zynqmp with own power rail.
>>
>> Then you should have separate compatible, because they are not
>> identical. It would also allow you to narrow the domains to versal and
>> also require it (on versal).
> 
> I can double check with HW guys but I am quite sure IP itself is exactly the 
> same. What it is different is that there is own power domain to it (not shared 
> one as is in zynqmp case).

What does it mean shared one? If several devices share power domain,
then they all should have power-domains property.

> 
> Also Linux is non secure sw and if secure firmware won't allow to change setting 
> of it it can't be required. I am just saying that Linux doesn't need to be owner 
> of any power domain that's why it shouldn't be required property.


Best regards,
Krzysztof