linux-kernel - Re: [PATCH 00/10] ASoC: dt-bindings: Rework Qualcomm APR/GPR Sound nodes for SM8450

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Date:   Mon, 14 Nov 2022 08:48:17 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Banajit Goswami <bgoswami@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, alsa-devel@...a-project.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Patrick Lai <plai@....qualcomm.com>,
        Srinivasa Rao Mandadapu <srivasam@....qualcomm.com>
Subject: Re: [PATCH 00/10] ASoC: dt-bindings: Rework Qualcomm APR/GPR Sound
 nodes for SM8450

On 11/11/2022 17:15, Srinivas Kandagatla wrote:
> 
> 
> On 11/11/2022 11:35, Krzysztof Kozlowski wrote:
>> Adding sound support for Qualcomm SM8450 SoC (and later for SC8280XP) brought
>> some changes to APR/GPR services bindings.  These bindings are part of
>> qcom,apr.yaml:
>>
>>    apr-or-gpr-device-node <- qcom,apr.yaml
>>      apr-gpr-service@[0-9] <- qcom,apr.yaml
>>        service-specific-components <- /schemas/sound/qcom,q6*.yaml
>>
>> The schema for services (apr-gpr-service@[0-9]) already grows considerably and
>> is still quite not specific.  It allows several incorrect combinations, like
>> adding a clock-controller to a APM device.  Restricting it would complicate the
>> schema even more.  Bringing new support for sound on Qualcomm SM8450 and
>> SC8280XP SoC would grow it as well.
> 
> Why would this grow? All the dsp services are static and they will not 
> change per SoC unless there is a total firmware change in DSP.

They grow now with SM8450 which requires changes there. Otherwise DTS
does not pass with current bindings. The bindings before my fixing in
2022 were really incomplete. Now they are complete, but:
1. Not for SM8450 - this will bring new things,
2. Very unspecific as they allow multiple invalid configurations.

> 
>>
>> Refactor the bindings before extending them for Qualcomm SM8450 SoC.
> 
> I dont understand this bit, what is SoC audio support to do with DSP 
> bindings. DSP bindings should be totally independent of this.

APR/GPR bindings are for SoC audio, so while adding SoC audio the first
are affected. If you went through the commits here, you would notice the
changes.

Best regards,
Krzysztof