linux-kernel - Re: [PATCH v3 5/5] arm64: dts: apple: Add CPU topology & cpufreq nodes for t8103

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Date:   Tue, 25 Oct 2022 12:02:33 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Hector Martin <marcan@...can.st>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Marc Zyngier <maz@...nel.org>,
        Mark Kettenis <mark.kettenis@...all.nl>, asahi@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 5/5] arm64: dts: apple: Add CPU topology & cpufreq
 nodes for t8103

On 24/10/2022 00:39, Hector Martin wrote:
> Add the missing CPU topology/capacity information and the cpufreq nodes,
> so we can have CPU frequency scaling and the scheduler has the
> information it needs to make the correct decisions.
> 

Thank you for your patch. There is something to discuss/improve.

> +
>  	timer {
>  		compatible = "arm,armv8-timer";
>  		interrupt-parent = <&aic>;
> @@ -124,6 +298,18 @@ soc {
>  		ranges;
>  		nonposted-mmio;
>  
> +		cpufreq_e: cpufreq@...e20000 {

Node name: performance-controller

> +			compatible = "apple,t8103-cluster-cpufreq", "apple,cluster-cpufreq";
> +			reg = <0x2 0x10e20000 0 0x1000>;
> +			#performance-domain-cells = <0>;
> +		};
> +
> +		cpufreq_p: cpufreq@...e20000 {

Ditto

> +			compatible = "apple,t8103-cluster-cpufreq", "apple,cluster-cpufreq";
> +			reg = <0x2 0x11e20000 0 0x1000>;
> +			#performance-domain-cells = <0>;
> +		};
> +
Krzysztof