linux-kernel - Re: [PATCH v2 06/14] arm64: dts: qcom: sdm630: Drop RPM bus clocks

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Date:   Wed, 13 Sep 2023 14:08:53 +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>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Sibi Sankar <quic_sibis@...cinc.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Wesley Cheng <quic_wcheng@...cinc.com>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        Alexey Minnekhanov <alexeymin@...tmarketos.org>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, iommu@...ts.linux.dev,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v2 06/14] arm64: dts: qcom: sdm630: Drop RPM bus clocks

On 13.09.2023 09:13, Krzysztof Kozlowski wrote:
> On 12/09/2023 15:31, Konrad Dybcio wrote:
>> These clocks are now handled from within the icc framework and are
>> no longer registered from within the CCF. Remove them.
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
[...]

>>  		anoc2_smmu: iommu@...0000 {
>>  			compatible = "qcom,sdm630-smmu-v2", "qcom,smmu-v2";
>>  			reg = <0x016c0000 0x40000>;
>> -
>> -			assigned-clocks = <&rpmcc RPM_SMD_AGGR2_NOC_CLK>;
>> -			assigned-clock-rates = <1000>;
>> -			clocks = <&rpmcc RPM_SMD_AGGR2_NOC_CLK>;
>> -			clock-names = "bus";
> 
> This is also against bindings. After your patch #4, such bus clock (or
> other combinations) is still required.
So, we have 4 SMMU instances on this platform:

MMSS (described, iface, mem, mem_iface)
GPU (described, iface-mm, iface-smmu, bus-smmu)

ANOC2 (this one, no clocks after removing rpmcc bus)
LPASS (no clocks)

Should I then create a new entry in the bindings, replicating
what's there for msm8998[1] and dropping the entry with just "bus"
from anyOf?

Konrad

[1] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/devicetree/bindings/iommu/arm,smmu.yaml?h=next-20230913#n272