linux-kernel - Re: [PATCH 05/23] arm64: zynqmp: Add L2 cache nodes

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Date:   Wed, 10 May 2023 14:34:12 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Michal Simek <michal.simek@....com>
Cc:     linux-kernel@...r.kernel.org, monstr@...str.eu,
        michal.simek@...inx.com, git@...inx.com,
        Radhey Shyam Pandey <radhey.shyam.pandey@....com>,
        Harini Katakam <harini.katakam@....com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Michael Grzeschik <m.grzeschik@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Robert Hancock <robert.hancock@...ian.com>,
        Tanmay Shah <tanmay.shah@....com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 05/23] arm64: zynqmp: Add L2 cache nodes

Hi Michal,

On Wed, May 10, 2023 at 09:15:30AM +0200, Michal Simek wrote:
> On 5/10/23 08:57, Laurent Pinchart wrote:
> > On Tue, May 02, 2023 at 03:35:33PM +0200, Michal Simek wrote:
> >> From: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> >>
> >> Linux kernel throws "cacheinfo: Unable to detect cache hierarchy for
> >> CPU 0" warning when booting on zu+ Soc. To fix it add the L2 cache
> >> node and let each CPU point to it.
> > 
> > The commit message should focus on how this change brings the DT in line
> > with the hardware, not on what the Linux kernel does.
> 
> ok.
> 
> >> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> >> Signed-off-by: Michal Simek <michal.simek@....com>
> >> ---
> >>
> >>   arch/arm64/boot/dts/xilinx/zynqmp.dtsi | 9 +++++++++
> >>   1 file changed, 9 insertions(+)
> >>
> >> diff --git a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
> >> index bb0d0be30aa0..c2d80c7967e9 100644
> >> --- a/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
> >> +++ b/arch/arm64/boot/dts/xilinx/zynqmp.dtsi
> >> @@ -33,6 +33,7 @@ cpu0: cpu@0 {
> >>   			operating-points-v2 = <&cpu_opp_table>;
> >>   			reg = <0x0>;
> >>   			cpu-idle-states = <&CPU_SLEEP_0>;
> >> +			next-level-cache = <&L2>;
> >>   		};
> >>   
> >>   		cpu1: cpu@1 {
> >> @@ -42,6 +43,7 @@ cpu1: cpu@1 {
> >>   			reg = <0x1>;
> >>   			operating-points-v2 = <&cpu_opp_table>;
> >>   			cpu-idle-states = <&CPU_SLEEP_0>;
> >> +			next-level-cache = <&L2>;
> >>   		};
> >>   
> >>   		cpu2: cpu@2 {
> >> @@ -51,6 +53,7 @@ cpu2: cpu@2 {
> >>   			reg = <0x2>;
> >>   			operating-points-v2 = <&cpu_opp_table>;
> >>   			cpu-idle-states = <&CPU_SLEEP_0>;
> >> +			next-level-cache = <&L2>;
> >>   		};
> >>   
> >>   		cpu3: cpu@3 {
> >> @@ -60,6 +63,12 @@ cpu3: cpu@3 {
> >>   			reg = <0x3>;
> >>   			operating-points-v2 = <&cpu_opp_table>;
> >>   			cpu-idle-states = <&CPU_SLEEP_0>;
> >> +			next-level-cache = <&L2>;
> >> +		};
> >> +
> >> +		L2: l2-cache {
> > 
> > Shouldn't labels be lower-case ?
> 
> Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.yaml:220:        L2_0: 
> l2-cache {
> Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.yaml:241: 
> L2_100: l2-cache {
> Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.yaml:257: 
> L2_200: l2-cache {
> Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.yaml:273: 
> L2_300: l2-cache {
> Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.yaml:289: 
> L2_400: l2-cache {
> Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.yaml:305: 
> L2_500: l2-cache {
> Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.yaml:321: 
> L2_600: l2-cache {
> Documentation/devicetree/bindings/cpufreq/cpufreq-qcom-hw.yaml:337: 
> L2_700: l2-cache {
> Documentation/devicetree/bindings/opp/opp-v2-kryo-cpu.yaml:116: 
> L2_0: l2-cache {
> Documentation/devicetree/bindings/opp/opp-v2-kryo-cpu.yaml:151: 
> L2_1: l2-cache {
> Documentation/devicetree/bindings/thermal/thermal-cooling-devices.yaml:77: 
>               L2_0: l2-cache {
> 
> And in dt spec - 6.2 chapter uppercase letter is valid chars for DTS labels.

Thanks for the clarification. It's all good.

-- 
Regards,

Laurent Pinchart