linux-kernel - Re: [PATCH 3/4] arm64: dts: qcom: x1e80100: Add BWMONs

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Message-ID: <6b46ed87-e225-bf74-dbe1-ad8913c585c7@quicinc.com>
Date: Thu, 13 Jun 2024 22:48:40 +0530
From: Sibi Sankar <quic_sibis@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>, <andersson@...nel.org>,
        <djakov@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <srinivas.kandagatla@...aro.org>
CC: <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-pm@...r.kernel.org>,
        <quic_rgottimu@...cinc.com>, <quic_kshivnan@...cinc.com>,
        <conor+dt@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <abel.vesa@...aro.org>
Subject: Re: [PATCH 3/4] arm64: dts: qcom: x1e80100: Add BWMONs



On 6/6/24 15:26, Konrad Dybcio wrote:
> On 4.06.2024 3:11 AM, Sibi Sankar wrote:
>> Add the CPU and LLCC BWMONs on X1E80100 SoCs.

Hey Konrad,

Thanks for taking time to review the series :)

>>
>> Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
>> ---
>>   arch/arm64/boot/dts/qcom/x1e80100.dtsi | 169 +++++++++++++++++++++++++
>>   1 file changed, 169 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/qcom/x1e80100.dtsi b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
>> index 1929c34ae70a..d86c4d3be126 100644
>> --- a/arch/arm64/boot/dts/qcom/x1e80100.dtsi
>> +++ b/arch/arm64/boot/dts/qcom/x1e80100.dtsi
>> @@ -5329,6 +5329,175 @@ cpu_scp_lpri1: scp-sram-section@200 {
>>   			};
>>   		};
>>   
>> +		pmu@...91000 {
>> +			compatible = "qcom,x1e80100-llcc-bwmon", "qcom,sc7280-llcc-bwmon";
>> +			reg = <0 0x24091000 0 0x1000>;
>> +
>> +			interrupts = <GIC_SPI 81 IRQ_TYPE_LEVEL_HIGH>;
>> +
>> +			interconnects = <&mc_virt MASTER_LLCC 3 &mc_virt SLAVE_EBI1 3>;
> 
> QCOM_ICC_TAG_ACTIVE_ONLY

ack

> 
> [...]
> 
>> +
>> +			cpu0_bwmon_opp_table: opp-table {
>> +				compatible = "operating-points-v2";
> 
> I *think* if you add opp-shared here, you can reference the same OPP table
> from all 3 BWMONs without anything exploding.

I did try this out before IIRC this resulted in just one device vote
in the interconnect_summary. Didn't investigate further before because
it was breaking bindings anyway. Will have another look at it.

-Sibi

> 
> Konrad