linux-kernel - Re: [v7 3/3] arm64: dts: qcom: sc7280: Add EPSS L3 interconnect provider

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Message-ID: <49ba33707767f856ff2a868906387b16@codeaurora.org>
Date:   Thu, 16 Sep 2021 13:30:34 +0530
From:   okukatla@...eaurora.org
To:     Stephen Boyd <swboyd@...omium.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        bjorn.andersson@...aro.org, devicetree@...r.kernel.org,
        evgreen@...gle.com, georgi.djakov@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mdtipton@...eaurora.org, sibis@...eaurora.org,
        saravanak@...gle.com, seansw@....qualcomm.com, elder@...aro.org,
        linux-pm@...r.kernel.org, linux-arm-msm-owner@...r.kernel.org,
        okukatla=codeaurora.org@...eaurora.org
Subject: Re: [v7 3/3] arm64: dts: qcom: sc7280: Add EPSS L3 interconnect
 provider

On 2021-09-16 01:10, Stephen Boyd wrote:
> Quoting okukatla@...eaurora.org (2021-09-14 23:26:19)
>> On 2021-09-15 10:35, okukatla@...eaurora.org wrote:
>> > On 2021-09-04 00:36, Stephen Boyd wrote:
>> >> Quoting Odelu Kukatla (2021-08-20 04:23:41)
>> >>> Add Epoch Subsystem (EPSS) L3 interconnect provider node on SC7280
>> >>> SoCs.
>> >>>
>> >>> Signed-off-by: Odelu Kukatla <okukatla@...eaurora.org>
>> >>> ---
>> >>>  arch/arm64/boot/dts/qcom/sc7280.dtsi | 11 +++++++++++
>> >>>  1 file changed, 11 insertions(+)
>> >>>
>> >>> diff --git a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> >>> b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> >>> index 53a21d0..cf59b47 100644
>> >>> --- a/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> >>> +++ b/arch/arm64/boot/dts/qcom/sc7280.dtsi
>> >>> @@ -1848,6 +1848,17 @@
>> >>>                         };
>> >>>                 };
>> >>>
>> >>> +               epss_l3: interconnect@...90000 {
>> >>> +                       compatible = "qcom,sc7280-epss-l3";
>> >>> +                       reg = <0 0x18590000 0 1000>,
>> >>
>> >> Is this supposed to be 0x1000?
>> >>
>> > No, This is 1000 or 0x3E8.
> 
> Wow ok. Why is it the only size that isn't in hex format? Please try to
> be consistent and use hex throughout.
> 
Sure, will update it to hex format in new revision.
>> We have mapped only required registers for L3 scaling, 1000/0x3E8 is
>> suffice.
>> But i will update it to 0x1000 in next revision so that entire clock
>> domain region-0 is mapped.
> 
> Doesn't that conflict with the cpufreq-hw device?
> 
epss_l3 maps (0x18590000, size:0x1000) region which cpufreq-hw does not 
need. I will update size to 0x1000 for this region only.

>> >>> +                             <0 0x18591000 0 0x100>,
>> >>> +                             <0 0x18592000 0 0x100>,
>> >>> +                             <0 0x18593000 0 0x100>;
>> >>> +                       clocks = <&rpmhcc RPMH_CXO_CLK>, <&gcc
>> >>> GCC_GPLL0>;
>> >>> +                       clock-names = "xo", "alternate";
>> >>> +                       #interconnect-cells = <1>;
>> >>> +               };
>> >>> +
>> >>>                 cpufreq_hw: cpufreq@...91000 {
>> >>>                         compatible = "qcom,cpufreq-epss";
>> >>>                         reg = <0 0x18591100 0 0x900>,