linux-kernel - Re: [PATCH 2/2] arm64: dts: Add Apple SoC GPU

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Message-ID: <20250611195959.GA3141695@robin.jannau.net>
Date: Wed, 11 Jun 2025 21:59:59 +0200
From: Janne Grunau <j@...nau.net>
To: fnkl.kernel@...il.com
Cc: Sven Peter <sven@...nel.org>, Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Neal Gompa <neal@...pa.dev>, David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, asahi@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: Add Apple SoC GPU

On Wed, Jun 11, 2025 at 07:32:17PM +0200, Sasha Finkelstein via B4 Relay wrote:
> From: Sasha Finkelstein <fnkl.kernel@...il.com>
> 
> Add device tree entries for GPUs in M-series SoCs
> 
> Signed-off-by: Sasha Finkelstein <fnkl.kernel@...il.com>
> ---
>  arch/arm64/boot/dts/apple/t6000.dtsi        |  4 ++++
>  arch/arm64/boot/dts/apple/t6001.dtsi        |  4 ++++
>  arch/arm64/boot/dts/apple/t6002.dtsi        |  4 ++++
>  arch/arm64/boot/dts/apple/t600x-common.dtsi | 34 ++++++++++++++++++++++++++++++++++
>  arch/arm64/boot/dts/apple/t600x-die0.dtsi   | 28 ++++++++++++++++++++++++++++
>  arch/arm64/boot/dts/apple/t8103.dtsi        | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  arch/arm64/boot/dts/apple/t8112.dtsi        | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  7 files changed, 198 insertions(+)

...

> diff --git a/arch/arm64/boot/dts/apple/t600x-common.dtsi b/arch/arm64/boot/dts/apple/t600x-common.dtsi
> index 87dfc13d74171f62bf3087401918d9d41eaac560..329bd084b63e3688547166a8d0c3d9ace5d6d937 100644
> --- a/arch/arm64/boot/dts/apple/t600x-common.dtsi
> +++ b/arch/arm64/boot/dts/apple/t600x-common.dtsi
> @@ -11,6 +11,10 @@ / {
>  	#address-cells = <2>;
>  	#size-cells = <2>;
>  
> +	aliases {
> +		gpu = &gpu;
> +	};
> +
>  	cpus {
>  		#address-cells = <2>;
>  		#size-cells = <0>;
> @@ -378,4 +382,34 @@ nco_clkref: clock-ref-nco {
>  		#clock-cells = <0>;
>  		clock-output-names = "nco_ref";
>  	};
> +
> +	reserved-memory {
> +		#address-cells = <2>;
> +		#size-cells = <2>;
> +		ranges;
> +
> +		gpu_globals: globals {
> +			reg = <0x0 0 0 0>;

all memory-regions with invalid address should be disabled. iirc the
kernel and/or u-boot will try to map those which does not end well.

Janne