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

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Message-ID: <098f0a07-a67a-4209-8dbb-ff8d5b699dfe@linaro.org>
Date:   Thu, 14 Sep 2023 09:41:01 +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 14.09.2023 08:26, Krzysztof Kozlowski wrote:
> On 13/09/2023 14:08, Konrad Dybcio wrote:
>> 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)
> 
> Ah, I did not notice it.
> 
>>
>> 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?
> 
> So this passes the bindings, right?
Yes

anyOf: in the binding should allow
> also no match, so this should be fine. However indeed we need to drop
> the "bus" entry, because it is not valid anymore.
Actually, looks like the LPASS smmu may require a single
clock. We can reuse that single-"bus"-clock entry for
HLOS1_VOTE_LPASS_ADSP_SMMU_CLK.

The device didn't crash when trying to access LPASS SMMU
with that clock absent, but I guess it may have just
been luck, things may change once more hardware is parked..

Konrad