linux-kernel - Re: [PATCH 1/2] dt-bindings: interrupt-controller: mpm: Allow passing reg through phandle

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Date:   Wed, 29 Mar 2023 13:18:46 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawn.guo@...aro.org>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: interrupt-controller: mpm: Allow passing
 reg through phandle



On 29.03.2023 10:27, Krzysztof Kozlowski wrote:
> On 28/03/2023 12:02, Konrad Dybcio wrote:
>> Due to the wild nature of the Qualcomm RPM Message RAM, we can't really
>> use 'reg' to point to the MPM's slice of Message RAM without cutting into
>> an already-defined RPM MSG RAM node used for GLINK and SMEM.
>>
>> Document passing the register space as a slice of SRAM through the
>> qcom,rpm-msg-ram property. This also makes 'reg' no longer required.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>  .../devicetree/bindings/interrupt-controller/qcom,mpm.yaml          | 6 +++++-
>>  1 file changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/qcom,mpm.yaml b/Documentation/devicetree/bindings/interrupt-controller/qcom,mpm.yaml
>> index 509d20c091af..77fe5e0b378f 100644
>> --- a/Documentation/devicetree/bindings/interrupt-controller/qcom,mpm.yaml
>> +++ b/Documentation/devicetree/bindings/interrupt-controller/qcom,mpm.yaml
>> @@ -30,6 +30,11 @@ properties:
>>      description:
>>        Specifies the base address and size of vMPM registers in RPM MSG RAM.
>>  
>> +  qcom,rpm-msg-ram:
>> +    $ref: /schemas/types.yaml#/definitions/phandle
>> +    description:
>> +      Phandle to the APSS MPM slice of the RPM Message RAM
>> +
>>    interrupts:
>>      maxItems: 1
>>      description:
>> @@ -64,7 +69,6 @@ properties:
>>  
>>  required:
>>    - compatible
>> -  - reg
> 
> Either:
> 1. make reg deprecated and require qcom,rpm-msg-ram
> or
> 2. you need oneOf:required for reg and qcom,rpm-msg-ram
Right, let's go with 1.

Konrad
> 
>>    - interrupts
>>    - mboxes
>>    - interrupt-controller
>>
> 
> Best regards,
> Krzysztof
>