Re: [PATCH 2/2] arm64: dts: qcom: Add qcs9075-radxa-airbox-q900

[Neil Armstrong <neil.armstrong@linaro.org>]

Hi,

On 3/18/26 09:36, Mecid Urganci wrote:
> Add device tree support for the Radxa AirBox Q900 board based on the
> Qualcomm QCS9075 SoC (Lemans Family).
> 
> This board features HDMI 2.0 via dp0, 2x USB 3.1 Gen 2 ports,
> 2x 2.5GbE Ethernet ports and onboard UFS storage.
> 
> Further information: https://radxa.com/products/fogwise/airbox-q900/
> 
> Functionality has been tested and confirmed working via an Armbian
> Debian Trixie build.
> 
> Signed-off-by: Mecid Urganci <mecid@mecomediagroup.de>
> Made-with: Cursor
> ---
>   arch/arm64/boot/dts/qcom/Makefile             |    1 +
>   .../dts/qcom/qcs9075-radxa-airbox-q900.dts    | 1012 +++++++++++++++++
>   2 files changed, 1013 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/qcom/qcs9075-radxa-airbox-q900.dts
> 
> diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
> index a4dc9e8b2d25..c8b7dd67806d 100644
> --- a/arch/arm64/boot/dts/qcom/Makefile
> +++ b/arch/arm64/boot/dts/qcom/Makefile
> @@ -180,6 +180,7 @@ qcs8300-ride-el2-dtbs := qcs8300-ride.dtb monaco-el2.dtbo
>   
>   dtb-$(CONFIG_ARCH_QCOM)	+= qcs8300-ride-el2.dtb
>   dtb-$(CONFIG_ARCH_QCOM)	+= qcs8550-aim300-aiot.dtb
> +dtb-$(CONFIG_ARCH_QCOM)	+= qcs9075-radxa-airbox-q900.dtb
>   dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride.dtb
>   dtb-$(CONFIG_ARCH_QCOM)	+= qcs9100-ride-r3.dtb
>   
> diff --git a/arch/arm64/boot/dts/qcom/qcs9075-radxa-airbox-q900.dts b/arch/arm64/boot/dts/qcom/qcs9075-radxa-airbox-q900.dts
> new file mode 100644
> index 000000000000..8b5202b527cb
> --- /dev/null
> +++ b/arch/arm64/boot/dts/qcom/qcs9075-radxa-airbox-q900.dts
> @@ -0,0 +1,1012 @@
> +// SPDX-License-Identifier: BSD-3-Clause
> +/*
> + * Copyright (c) 2026 Mecid Urganci
> + */
> +
> +/dts-v1/;
> +
> +#include <dt-bindings/gpio/gpio.h>
> +#include <dt-bindings/leds/common.h>
> +#include <dt-bindings/regulator/qcom,rpmh-regulator.h>
> +
> +#include "lemans.dtsi"
> +#include "lemans-pmics.dtsi"
> +
> +/ {
> +	model = "Radxa AIRbox Q900";

The radxa pages shows "Radxa Fogwise® AIRbox Q900", why did you drop Fogwise ?

> +	compatible = "radxa,airbox-q900", "qcom,qcs9075", "qcom,sa8775p";
> +

<snip>

> +
> +	dp0-connector {
> +		compatible = "dp-connector";
> +		label = "eDP0";
> +		type = "full-size";
> +
> +		port {
> +			dp0_connector_in: endpoint {
> +				remote-endpoint = <&mdss0_dp0_out>;
> +			};
> +		};

The device has an HDMI output, and this is probably provided by a DP to HDMI IC,
please represent it here.

> +	};
> +};
> +

<snip>

> +};
> +
> +/ {
> +	thermal-zones {
> +		cpu-0-0-0-thermal {
> +			polling-delay-passive = <1000>;
> +			polling-delay = <5000>;
> +
> +			trips {
> +				fan_on: fan-on {
> +					temperature = <40000>;
> +					hysteresis = <5000>;
> +					type = "active";
> +				};
> +			};
> +
> +			cooling-maps {
> +				map-fan {
> +					trip = <&fan_on>;
> +					cooling-device = <&fan0 1 1>;
> +				};
> +			};
> +		};
> +	};

So the fan only cools the cpu0 ?? not the gpu ?

Neil

> +};