linux-kernel - Re: [PATCH 1/3] dt-bindings: interconnect: Add EPSS L3 compatible for SA8775P

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Message-ID: <672ceb3d-1b19-461f-b17c-eaa50d936aa5@quicinc.com>
Date: Fri, 25 Oct 2024 21:06:50 +0530
From: Raviteja Laggyshetty <quic_rlaggysh@...cinc.com>
To: Krzysztof Kozlowski <krzk@...nel.org>, Georgi Djakov <djakov@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Odelu Kukatla
	<quic_okukatla@...cinc.com>
CC: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sibi Sankar
	<quic_sibis@...cinc.com>, <linux-arm-msm@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: interconnect: Add EPSS L3 compatible for
 SA8775P



On 9/4/2024 11:53 PM, Krzysztof Kozlowski wrote:
> On 04/09/2024 19:12, Raviteja Laggyshetty wrote:
>> Add Epoch Subsystem (EPSS) L3 interconnect provider binding on
>> SA8775P SoCs.
>>
>> Signed-off-by: Raviteja Laggyshetty <quic_rlaggysh@...cinc.com>
>> ---
>>  Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml b/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml
>> index 21dae0b92819..de2c59ddc94a 100644
>> --- a/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml
>> +++ b/Documentation/devicetree/bindings/interconnect/qcom,osm-l3.yaml
>> @@ -33,6 +33,8 @@ properties:
>>                - qcom,sm6375-cpucp-l3
>>                - qcom,sm8250-epss-l3
>>                - qcom,sm8350-epss-l3
>> +              - qcom,sa8775p-epss-l3-cl0
>> +              - qcom,sa8775p-epss-l3-cl1
> 
> Your device driver change suggests that cl0 is compatible with other
> variants.
> 
> And what about generic fallback here? Can it be used and device will be
> operating correctly?
> 

Falling back to "qcom,epss-l3" won't work because we need to vote into perf state register.
I am introducing a new fallback compatible "qcom,epss-l3-perf" for perf voting, which can be used for upcoming qcs8300.

epss_l3_cl0: interconnect@...90000 {
       compatible = "qcom,sa8775p-epss-l3", "qcom,epss-l3-perf";	   
};

> Best regards,
> Krzysztof
>