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

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Message-ID: <1c2aa022-348a-8ac2-1a26-eedf57aadb77@linaro.org>
Date:   Wed, 10 May 2023 09:58:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Claudiu.Beznea@...rochip.com, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, Nicolas.Ferre@...rochip.com,
        alexandre.belloni@...tlin.com
Cc:     linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/5] dt-bindings: clocks: atmel,at91rm9200-pmc: convert
 to yaml

On 10/05/2023 09:14, Claudiu.Beznea@...rochip.com 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@...rochip.com 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@...rochip.com>
>>>>> +
>>>>> +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?

Best regards,
Krzysztof