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

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Date:   Wed, 10 May 2023 09:15:30 +0200
From:   Michal Simek <michal.simek@....com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.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 Laurent,

On 5/10/23 08:57, Laurent Pinchart wrote:
> Hi Michal,
> 
> Thank you for the patch.
> 
> 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,
Michal