linux-kernel - Re: [PATCH 17/22] dt-bindings: serial: document support for SA8255p

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Message-ID: <19f5389a-a88b-4f29-98fd-c9d539c7c225@quicinc.com>
Date: Thu, 29 Aug 2024 07:27:15 -0700
From: Nikunj Kela <quic_nkela@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
CC: <andersson@...nel.org>, <konradybcio@...nel.org>, <robh@...nel.org>,
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        <quic_psodagud@...cinc.com>, <quic_tsoni@...cinc.com>,
        <quic_shazhuss@...cinc.com>, Praveen Talari <quic_ptalari@...cinc.com>
Subject: Re: [PATCH 17/22] dt-bindings: serial: document support for SA8255p


On 8/29/2024 12:41 AM, Krzysztof Kozlowski wrote:
> On Wed, Aug 28, 2024 at 01:37:16PM -0700, Nikunj Kela wrote:
>> Add compatibles representing UART support on SA8255p.
>>
>> Clocks and interconnects are being configured in the firmware VM
>> on SA8255p platform, therefore making them optional.
>>
>> CC: Praveen Talari <quic_ptalari@...cinc.com>
>> Signed-off-by: Nikunj Kela <quic_nkela@...cinc.com>
>> ---
>>  .../serial/qcom,serial-geni-qcom.yaml         | 58 ++++++++++++++++---
>>  1 file changed, 51 insertions(+), 7 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml
>> index dd33794b3534..dcd43e1353ec 100644
>> --- a/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml
>> +++ b/Documentation/devicetree/bindings/serial/qcom,serial-geni-qcom.yaml
>> @@ -13,11 +13,42 @@ maintainers:
>>  allOf:
>>    - $ref: /schemas/serial/serial.yaml#
> Please move entire allOf: to the place after "required:" block.
>
>>  
>> +  - if:
>> +      properties:
>> +        compatible:
>> +          contains:
>> +            enum:
>> +              - qcom,sa8255p-geni-uart
>> +              - qcom,sa8255p-geni-debug-uart
>> +    then:
>> +      required:
>> +        - power-domains
>> +        - power-domain-names
>> +      properties:
>> +        power-domains:
>> +          minItems: 2
>> +          maxItems: 2
>> +    else:
>> +      required:
>> +        - clocks
>> +        - clock-names
>> +      properties:
>> +        power-domains:
>> +          maxItems: 1
>> +        interconnects:
>> +          maxItems: 2
>> +        interconnect-names:
>> +          items:
>> +            - const: qup-core
>> +            - const: qup-config
>> +
>>  properties:
>>    compatible:
>>      enum:
>>        - qcom,geni-uart
>>        - qcom,geni-debug-uart
>> +      - qcom,sa8255p-geni-uart
>> +      - qcom,sa8255p-geni-debug-uart
> Not compatible with the old ones? Well, it is impossible. Generic
> compatible like "qcom,geni-uart" means ALL DEVICES forever will be
> compatible, because otherwise it just does not make any sense.  Of
> course "all devices forever will be compatible" is impossible as well,
> thus DT maintainers are suggesting SoC-specific compatibles all the
> time, but if developers decide that they know the future, you should
> keep it, right?

Hi Krzysztof,

SA8255p uart is not compatible with generic ones. While I get your
point, could you please advise how to proceed on this? Of course, no one
could predict the future at the time generic compatibles were added but
here we are now with the usecase!

Thanks,

-Nikunj

>>  
>>    clocks:
>>      maxItems: 1
>> @@ -26,12 +57,10 @@ properties:
>>      const: se
>>  
>>    interconnects:
>> -    maxItems: 2
>> +    description: phandles of interconnect bw provider
> Constraints must stay in top-level.
>
> Best regards,
> Krzysztof
>