Re: [PATCH v3 2/5] dt-bindings: clocks: atmel,at91rm9200-pmc: convert to yaml

[Conor Dooley]

On Thu, May 11, 2023 at 06:29:39AM +0000, Claudiu.Beznea@xxxxxxxxxxxxx wrote:
> On 10.05.2023 13:12, Krzysztof Kozlowski wrote:
> > EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> > 
> > On 10/05/2023 10:31, Claudiu.Beznea@xxxxxxxxxxxxx wrote:
> >> On 10.05.2023 10:58, Krzysztof Kozlowski wrote:
> >>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >>>
> >>> On 10/05/2023 09:14, Claudiu.Beznea@xxxxxxxxxxxxx wrote:
> >>>> On 10.05.2023 10:06, Krzysztof Kozlowski wrote:
> >>>>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >>>>>
> >>>>> On 10/05/2023 09:00, Claudiu.Beznea@xxxxxxxxxxxxx wrote:
> >>>>>> On 09.05.2023 09:25, Krzysztof Kozlowski wrote:
> >>>>>>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> >>>>>>>
> >>>>>>> On 09/05/2023 07:27, Claudiu Beznea wrote:
> >>>>>>>> Convert Atmel PMC documentation to yaml. Along with it clock names
> >>>>>>>> were adapted according to the current available device trees as
> >>>>>>>> different controller versions accept different clocks (some of them
> >>>>>>>> have 3 clocks as input, some has 2 clocks as inputs and some with 2
> >>>>>>>> input clocks uses different clock names).
> >>>>>>>>
> >>>>>>>
> >>>>>>> Thank you for your patch. There is something to discuss/improve.
> >>>>>>>
> >>>>>>>> +title: Atmel Power Management Controller (PMC)
> >>>>>>>> +
> >>>>>>>> +maintainers:
> >>>>>>>> +  - Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
> >>>>>>>> +
> >>>>>>>> +description:
> >>>>>>>> +  The power management controller optimizes power consumption by controlling all
> >>>>>>>> +  system and user peripheral clocks. The PMC enables/disables the clock inputs
> >>>>>>>> +  to many of the peripherals and to the processor.
> >>>>>>>> +
> >>>>>>>> +properties:
> >>>>>>>> +  compatible:
> >>>>>>>> +    oneOf:
> >>>>>>>> +      - items:
> >>>>>>>> +          - enum:
> >>>>>>>> +              - atmel,at91sam9g15-pmc
> >>>>>>>> +              - atmel,at91sam9g20-pmc
> >>>>>>>> +              - atmel,at91sam9g25-pmc
> >>>>>>>> +              - atmel,at91sam9g35-pmc
> >>>>>>>> +              - atmel,at91sam9x25-pmc
> >>>>>>>> +              - atmel,at91sam9x35-pmc
> >>>>>>>> +          - enum:
> >>>>>>>> +              - atmel,at91sam9260-pmc
> >>>>>>>> +              - atmel,at91sam9x5-pmc
> >>>>>>>
> >>>>>>> I missed it last time - why you have two enums? We never talked about
> >>>>>>> this. It's usually wrong... are you sure this is real hardware:
> >>>>>>> atmel,at91sam9g20-pmc, atmel,at91sam9260-pmc
> >>>>>>> ?
> >>>>>>
> >>>>>> I have 2 enums because there are some hardware covered by:
> >>>>>> "vendor-name,hardware-v1-pmc", "syscon" and some covered by:
> >>>>>> "vendor-name,hardware-v2-pmc", "vendor-name,hardware-v1-pmc", "syscon".
> >>>>>
> >>>>> The enum does not say this. At all.
> >>>>>
> >>>>> So again, answer, do not ignore:
> >>>>> is this valid setup:
> >>>>> atmel,at91sam9g20-pmc, atmel,at91sam9260-pmc
> >>>>> ?
> >>>>
> >>>> Not w/o syscon. This is valid:
> >>>
> >>> Syscon is not important here, but indeed I missed it.
> >>>
> >>>>
> >>>> compatible = "atmel,at91sam9g20-pmc", "atmel,at91sam9260-pmc", "syscon";
> >>>>
> >>>> available in arch/arm/boot/dts/at91sam9g20.dtsi +45
> >>>
> >>> Nice, so my random choice was actually correct. Ok, so another:
> >>>
> >>> atmel,at91sam9g15-pmc, atmel,at91sam9260-pmc, syscon
> >>>
> >>> Is it valid hardware?
> >>
> >> This one, no. So, I guess, the wrong here is that there could be
> >> combinations that are not for actual hardware and yet considered valid by
> >> changes in this patch?
> > 
> > I just don't understand why you have two enums. This is not a pattern
> > which is allowed anywhere. It might appear but only as exception or mistake.
> 
> I'm not at all an YAML expert and this is how I've managed to make
> dt_binding_check/dtbs_check happy.

Picking one item at random, do the devicetrees contain stuff like:
"atmel,at91sam9g35-pmc", "atmel,at91sam9260-pmc", "syscon"
//AND//
"atmel,at91sam9g35-pmc", "atmel,at91sam9x5-pmc", "syscon"
?

If not, why do you not break it down to something like:
- items:
    - enum:
        - atmel,compatible
        - atmel,with
        - atmel,sam9260's pmc
    - const: atmel,at91sam9260-pmc
    - const: syscon

- items:
    - enum:
        - atmel,compatible
        - atmel,with
        - atmel,sam9x5's pmc
    - const: atmel,at91sam9x5-pmc
    - const: syscon

Cheers,
Conor.

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