linux-kernel - Re: [PATCH 09/11] arm64: dts: qcom: msm8998: Remove AGGRE2 clock from SLPI

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Date:   Wed, 26 Jul 2023 17:48:35 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Jeffrey Hugo <quic_jhugo@...cinc.com>,
        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>
Cc:     Marijn Suijten <marijn.suijten@...ainline.org>,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/11] arm64: dts: qcom: msm8998: Remove AGGRE2 clock from
 SLPI

On 21.07.2023 17:50, Jeffrey Hugo wrote:
> On 7/21/2023 9:36 AM, Konrad Dybcio wrote:
>> The AGGRE2 clock is a clock for the entire AGGRE2 bus, managed from
>> within the interconnect driver. Attaching it to SLPI was a total hack.
>> Get rid of it.
> 
> Nit - why do we care what driver manages the clock?  DT describes hardware...
> 
> The entire SLPI block hangs off the AGGRE2 bus, so that bus needs to be on for the SLPI.  I agree that AGGRE2 is really an interconnect device and SLPI should be a consumer of that, but we don't have 8998 interconnects defined yet.  Seems like this hack is still needed.
I'll try to get somebody to check on a device with working SLPI, but
the DT-side explanation here is: this is not a clock. It's previously
been misrepresented as such, but it lies within the "interconnect"
class.

Konrad
> 
>>
>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>> ---
>>   arch/arm64/boot/dts/qcom/msm8998.dtsi | 5 ++---
>>   1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/msm8998.dtsi b/arch/arm64/boot/dts/qcom/msm8998.dtsi
>> index 360fe3edcc08..547c3f9654a6 100644
>> --- a/arch/arm64/boot/dts/qcom/msm8998.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/msm8998.dtsi
>> @@ -1599,9 +1599,8 @@ remoteproc_slpi: remoteproc@...0000 {
>>                 px-supply = <&vreg_lvs2a_1p8>;
>>   -            clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>,
>> -                 <&rpmcc RPM_SMD_AGGR2_NOC_CLK>;
>> -            clock-names = "xo", "aggre2";
>> +            clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>;
>> +            clock-names = "xo";
>>                 memory-region = <&slpi_mem>;
>>  
>