Re: [PATCH v5 2/6] dt-bindings: PCI: renesas,pci-rcar-gen2: Add device tree support for r9a06g032

[Krzysztof Kozlowski]

On 03/05/2022 08:51, Geert Uytterhoeven wrote:
>>>> This should not be a reason why a property is or is not required. Either
>>>> this is required for device operation or not. If it is required, should
>>>> be in the bindings. Otherwise what are you going to do in the future?
>>>> Add a required property breaking the ABI?
>>>
>>> The problem is that there are no bindings for the reset controller
>>> (actually the reset controller feature of the system-controller) yet.
>>> Yeah, we can just add #reset-cells = <1> to the system-controller
>>> device node, but we cannot add the actual resets properties to the
>>> consumers, until the actual cell values are defined.
>>
>> Sounds like you should implement providers first. Or just live with the
>> warning as a reminder to implement the reset provider?
> 
> I'd go for the latter. The upstream r9a06g032.dtsi is still under active
> development. Until very recently, the only device supported was the
> serial console.

For clocks we use in such cases fixed-clock placeholders or empty
phandles. Maybe something like that would work here as well?

Best regards,
Krzysztof