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

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Date:   Wed, 10 May 2023 09:57:50 +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,

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.

> 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 ?

> +			compatible = "cache";
> +			cache-level = <2>;
>  		};
>  
>  		idle-states {

-- 
Regards,

Laurent Pinchart