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Message-ID: <1ceeb56e-3efd-6858-358a-bd1976c625b1@linaro.org>
Date:   Tue, 30 May 2023 15:35:09 +0200
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Subject: Re: [PATCH v8 01/18] dt-bindings: display/msm: gpu: Document GMU
 wrapper-equipped A6xx
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To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Cc:     freedreno@lists.freedesktop.org, Sean Paul <sean@poorly.run>,
        Akhil P Oommen <quic_akhilpo@quicinc.com>,
        devicetree@vger.kernel.org, Bjorn Andersson <andersson@kernel.org>,
        Marijn Suijten <marijn.suijten@somainline.org>,
        linux-arm-msm@vger.kernel.org, David Airlie <airlied@gmail.com>,
        dri-devel@lists.freedesktop.org, Rob Clark <robdclark@gmail.com>,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Conor Dooley <conor+dt@kernel.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        Rob Clark <robdclark@chromium.org>,
        Konrad Dybcio <konrad.dybcio@somainline.org>,
        linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
References: <20230223-topic-gmuwrapper-v8-0-69c68206609e@linaro.org>
 <20230223-topic-gmuwrapper-v8-1-69c68206609e@linaro.org>
 <20230530122652.lct6tk6zseny6gxl@krzk-bin>
From:   Konrad Dybcio <konrad.dybcio@linaro.org>
In-Reply-To: <20230530122652.lct6tk6zseny6gxl@krzk-bin>
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On 30.05.2023 14:26, Krzysztof Kozlowski wrote:
> On Mon, 29 May 2023 15:52:20 +0200, Konrad Dybcio wrote:
>> The "GMU Wrapper" is Qualcomm's name for "let's treat the GPU blocks
>> we'd normally assign to the GMU as if they were a part of the GMU, even
>> though they are not". It's a (good) software representation of the GMU_CX
>> and GMU_GX register spaces within the GPUSS that helps us programatically
>> treat these de-facto GMU-less parts in a way that's very similar to their
>> GMU-equipped cousins, massively saving up on code duplication.
>>
>> The "wrapper" register space was specifically designed to mimic the layout
>> of a real GMU, though it rather obviously does not have the M3 core et al.
>>
>> GMU wrapper-equipped A6xx GPUs require clocks and clock-names to be
>> specified under the GPU node, just like their older cousins. Account
>> for that.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
>> ---
>>  .../devicetree/bindings/display/msm/gpu.yaml       | 61 ++++++++++++++++++----
>>  1 file changed, 52 insertions(+), 9 deletions(-)
>>
> 
> Running 'make dtbs_check' with the schema in this patch gives the
> following warnings. Consider if they are expected or the schema is
> incorrect. These may not be new warnings.
I think it'd be beneficial if the bot diffed the output of checks pre-
and post- patch.

Konrad
> 
> Note that it is not yet a requirement to have 0 warnings for dtbs_check.
> This will change in the future.
> 
> Full log is available here: https://patchwork.ozlabs.org/patch/1787121
> 
> 
> gpu@2c00000: compatible: 'oneOf' conditional failed, one must be fixed:
> 	arch/arm64/boot/dts/qcom/sm8150-hdk.dtb
> 	arch/arm64/boot/dts/qcom/sm8150-mtp.dtb