linux-kernel - Re: [PATCH v5 7/7] arm64: dts: qcom: sc7280: Add DT nodes for the TBUs

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Message-ID: <4fc15eda-07e1-4e8d-b5d7-bcc66c69f310@kernel.org>
Date: Thu, 29 Feb 2024 22:14:11 +0200
From: Georgi Djakov <djakov@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 Georgi Djakov <quic_c_gdjako@...cinc.com>, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, will@...nel.org,
 robin.murphy@....com, joro@...tes.org, iommu@...ts.linux.dev
Cc: devicetree@...r.kernel.org, andersson@...nel.org,
 konrad.dybcio@...aro.org, robdclark@...il.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, quic_cgoldswo@...cinc.com,
 quic_sukadev@...cinc.com, quic_pdaly@...cinc.com, quic_sudaraja@...cinc.com
Subject: Re: [PATCH v5 7/7] arm64: dts: qcom: sc7280: Add DT nodes for the
 TBUs

Hi Krzysztof,

On 29.02.24 19:55, Krzysztof Kozlowski wrote:
> On 26/02/2024 18:22, Georgi Djakov wrote:
>> Add the device-tree nodes for the TBUs (translation buffer units) that
>> are present on the sc7280 platforms. The TBUs can be used debug the
>> kernel and provide additional information when a context faults occur.
>>
>> Describe the all registers, clocks, interconnects and power-domain
>> resources that are needed for each of the TBUs.
>>
>> Signed-off-by: Georgi Djakov <quic_c_gdjako@...cinc.com>
>> ---
>>   arch/arm64/boot/dts/qcom/sc7280.dtsi | 89 ++++++++++++++++++++++++++++
>>   1 file changed, 89 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> index 83b5b76ba179..cc42560f63ad 100644
>> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> @@ -2905,6 +2905,18 @@ adreno_smmu: iommu@...0000 {
>>   			dma-coherent;
>>   		};
>>   
>> +		gfx_0_tbu: tbu@...9000 {
>> +			compatible = "qcom,qsmmuv500-tbu";
>> +			reg = <0x0 0x3dd9000 0x0 0x1000>;
>> +			qcom,stream-id-range = <&adreno_smmu 0x0 0x400>;
> 
> Where are the clocks/interconnects/power-domains? Your binding said it
> is exactly (100%) the same as SDM845, so either binding is missing
> compatibles or this is incomplete.

The clocks/interconnects/power-domains are optional and each of them could
be present or not. And that's why none of these properties are listed as
"required".

BR,
Georgi