linux-kernel - Re: [PATCH v6 4/4] arm64: dts: qcom: Add Lenovo ThinkBook 16 G7 QOY device tree

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Message-ID: <ee088b5a-e792-4704-8f1e-e709f1b0c5fc@oss.qualcomm.com>
Date: Sat, 14 Jun 2025 21:39:22 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: jens.glathe@...schoolsolutions.biz,
        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>,
        Matthias Kaehlcke <mka@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Aleksandrs Vinarskis <alex.vinarskis@...il.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v6 4/4] arm64: dts: qcom: Add Lenovo ThinkBook 16 G7 QOY
 device tree

On 6/7/25 9:19 PM, Jens Glathe via B4 Relay wrote:
> From: Jens Glathe <jens.glathe@...schoolsolutions.biz>
> 
> Device tree for the Lenovo Thinkbook 16 G7 QOY
> 
> The Laptop is a Snapdragon X1 / X1 Plus (Purwa) based device [1].
> 
> Supported features:
> 
> - USB type-c and type-a ports
> - Keyboard
> - Touchpad (all that are described in the dsdt)
> - Touchscreen (described in the dsdt, no known SKUss)
> - Display including PWM backlight control
> - PCIe devices
> - nvme
> - SDHC card reader
> - ath12k WCN7850 Wifi and Bluetooth
> - ADSP and CDSP
> - GPIO keys (Lid switch)
> - Sound via internal speakers / DMIC / USB / headphone jack
> - DP Altmode with 2 lanes (as all of these still do)
> - Integrated fingerprint reader (FPC)
> - Integrated UVC camera
> 
> Not supported yet:
> 
> - HDMI port.
> - EC and some fn hotkeys.
> 
> Limited support yet:
> 
> - SDHC card reader is based on the on-chip sdhc_2 controller, but the driver from
> the Snapdragon Dev Kit is only a partial match. It can do normal slow sd cards,
> but not UHS-I (SD104) and UHS-II.
> 
> - The GPU is not yet supported. Graphics is only software rendered.
> 
> This work was done without any schematics or non-public knowledge of the device.
> So, it is based on the existing x1e device trees, dsdt analysis, using HWInfo
> ARM64, and pure guesswork. It has been confirmed, however, that the device really
> has 4 NXP PTN3222 eUSB2 repeaters, one of which doesn't have a reset GPIO (eusb5
> @43).
> 
> Signed-off-by: Jens Glathe <jens.glathe@...schoolsolutions.biz>
> Co-developed by: Aleksandrs Vinarskis <alex.vinarskis@...il.com>
> ---

[...]

> +
> +		pinctrl-names = "default";
> +		pinctrl-0 = <&wcd_default>;

property-n
property-names

please

[...]

> +	/*
> +	 * This is an odd one. The camera is physically behind the eusb9 repeater (confirmed) but
> +	 * if it is placed below the usb_2_dwc3 node, it will be switched of after ~30 seconds.
> +	 * The whole reason it is described in the dt (as an USB device) is its requirement for
> +	 * that additional regulator, and to get power management to switch it off when suspended.
> +	 * Defining it stand-alone does work.
> +	 */

Looks like DWC3 only does of_platform_populate() ("probe drivers for
child nodes") in drd.c, and your dt sets everything to host-only..

[...]

> +&tlmm {
> +	gpio-reserved-ranges = <34 2>, /* Unused */
> +		<72 2>, /* Secure EC I2C connection (?) */
> +		<238 1>; /* UFS Reset */

Please align the '<'s

Konrad