linux-hardening - Re: [PATCH v4 2/2] arm64: dts: qcom: msm8953-lenovo-kuntao: Add initial device tree

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Message-ID: <e516564b-5e43-4628-836c-ff227a68d20e@oss.qualcomm.com>
Date: Mon, 3 Nov 2025 12:23:29 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Raihan Ahamed <raihan1999ahamed@...il.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>, Kees Cook <kees@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        "Guilherme G . Piccoli"
 <gpiccoli@...lia.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v4 2/2] arm64: dts: qcom: msm8953-lenovo-kuntao: Add
 initial device tree

On 10/31/25 2:51 PM, Raihan Ahamed wrote:
> Lenovo P2 is a handset using the MSM8953 SoC released in 2016
> 
> Add a device tree with initial support for:
> 
> - Enable accelerometer sensor
> - Enable pinctrl for GPIO keys
> - Enable gpu and add gpu_zap_shader
> - GPIO keys
> - SDHCI (internal and external storage)
> - USB Device Mode
> - WCNSS (WiFi/BT)
> - Regulators
> 
> Signed-off-by: Raihan Ahamed <raihan1999ahamed@...il.com>
> ---

[...]

> +++ b/arch/arm64/boot/dts/qcom/msm8953-lenovo-kuntao.dts
> @@ -0,0 +1,294 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (C) 2024, Raihan Ahamed <raihan1999ahamed@...il.com>
> + */
> +/dts-v1/;
> +
> +#include "msm8953.dtsi"
> +#include "pm8953.dtsi"
> +#include "pmi8950.dtsi"
> +
> +/delete-node/ &qseecom_mem;
> +
> +/ {
> +	model = "Lenovo P2";
> +	compatible = "lenovo,kuntao", "qcom,msm8953";
> +	chassis-type = "handset";
> +	qcom,msm-id = <0x125 0x00>;

QCOM_ID_MSM8953 (dt-bindings/arm/qcom,ids.h)

> +	qcom,board-id = <0x41 0x82b1 0x41 0x83b0>;
> +
> +	gpio-keys {
> +		compatible = "gpio-keys";
> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&gpio_key_default>;

property-n
property-names

in this order, please
> +
> +		key-volume-up {
> +			label = "Volume Up";
> +			gpios = <&tlmm 85 GPIO_ACTIVE_LOW>;
> +			linux,code = <KEY_VOLUMEUP>;
> +			debounce-interval = <15>;
> +		};
> +
> +		one-key-low-power {
> +			label = "onekeylowpower";
> +			gpios = <&tlmm 86 GPIO_ACTIVE_LOW>;
> +			linux,code = <ABS_HAT1Y>;
> +			debounce-interval = <15>;
> +		};
> +
> +		homepage {
> +			label = "homepage";
> +			gpios = <&tlmm 132 GPIO_ACTIVE_LOW>;
> +			linux,code = <KEY_HOMEPAGE>;
> +			debounce-interval = <15>;
> +			gpio-key,wakeup;
> +		};

Please sort these nodes without an address by their name> +	};
> +
> +	reserved-memory {
> +		qseecom_mem: qseecom@...00000 {
> +			reg = <0x0 0x84a00000 0x0 0x1900000>;
> +			no-map;
> +		};
> +
> +		ramoops@...00000 {
> +			compatible = "ramoops";
> +			reg = <0x0 0x8ee00000 0x0 0x80000>;
> +			console-size = <0x40000>;
> +			ftrace-size = <0x15000>;
> +			record-size = <0x5000>;
> +			pmsg-size = <0x2000>;

Usually ecc-size = <8> is desired, as the traces are often corrupted

[...]

> +&tlmm {
> +	gpio-reserved-ranges = <0 4>, <135 4>;

Any chance you know what is on these GPIOs, and could document it (e.g.
like in x1-crd.dtsi)

Konrad