linux-kernel - Re: [PATCH 08/10] arm64: dts: qcom: Add initial support for MSM8937

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Message-ID: <7664b71c-ed47-4765-9ac4-5dbe3ec80d3c@oss.qualcomm.com>
Date: Wed, 12 Feb 2025 14:07:19 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Barnabás Czémán <barnabas.czeman@...nlining.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd
 <sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Stephan Gerhold <stephan@...hold.net>,
        Otto Pflüger <otto.pflueger@...cue.de>,
        Linus Walleij <linus.walleij@...aro.org>, Lee Jones <lee@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, iommu@...ts.linux.dev,
        Dang Huynh <danct12@...eup.net>
Subject: Re: [PATCH 08/10] arm64: dts: qcom: Add initial support for MSM8937

On 11.02.2025 11:37 PM, Barnabás Czémán wrote:
> From: Dang Huynh <danct12@...eup.net>
> 
> Add initial support for MSM8937 SoC.
> 
> Signed-off-by: Dang Huynh <danct12@...eup.net>
> Co-developed-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
> Signed-off-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
> ---

So the computer tells me 8917 and 8937 are *very* similar. Have you
tried assessing how making 8937.dtsi an overlay atop 8917.dtsi would
work out?


>  arch/arm64/boot/dts/qcom/msm8937.dtsi | 2145 +++++++++++++++++++++++++++++++++
>  1 file changed, 2145 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/qcom/msm8937.dtsi b/arch/arm64/boot/dts/qcom/msm8937.dtsi
> new file mode 100644
> index 0000000000000000000000000000000000000000..ef633c1694ad98165e58130cbeb186d2f0e2dcaa
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/msm8937.dtsi
> @@ -0,0 +1,2145 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) 2023, Dang Huynh <danct12@...eup.net>
> + */
> +
> +#include <dt-bindings/clock/qcom,gcc-msm8917.h>
> +#include <dt-bindings/clock/qcom,rpmcc.h>
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/power/qcom-rpmpd.h>
> +#include <dt-bindings/thermal/thermal.h>
> +
> +/ {
> +	interrupt-parent = <&intc>;
> +
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +
> +	clocks {
> +		xo_board: xo-board {
> +			compatible = "fixed-clock";
> +			#clock-cells = <0>;
> +		};
> +
> +		sleep_clk: sleep-clk {
> +			compatible = "fixed-clock";
> +			#clock-cells = <0>;
> +		};
> +	};
> +
> +	cpus {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		cpu4: cpu@0 {

I'm pretty sure a CPU with a MPIDR of 0 should be called CPU0

> +			compatible = "arm,cortex-a53";
> +			reg = <0x0>;
> +			device_type = "cpu";
> +			enable-method = "psci";
> +			operating-points-v2 = <&cpu_opp_table_c0>;
> +			next-level-cache = <&l2_0>;
> +			#cooling-cells = <2>;
> +			l2_0: l2-cache {

Please add a newline between the last property and the subnode

> +				compatible = "cache";
> +				cache-level = <2>;

cache-size = <0x80000>;

[...]

> +		cpu0: cpu@100 {
> +			compatible = "arm,cortex-a53";
> +			reg = <0x100>;
> +			device_type = "cpu";
> +			next-level-cache = <&l2_1>;
> +			enable-method = "psci";
> +			operating-points-v2 = <&cpu_opp_table_c1>;
> +			#cooling-cells = <2>;
> +			power-domains = <&cpu_pd0>;
> +			power-domain-names = "psci";
> +			l2_1: l2-cache {
> +				compatible = "cache";
> +				cache-level = <2>;

cache-size = <0x100000>;

I'll do further review if you decide it makes sense to keep this
separate from 8917

Konrad