linux-kernel - Re: [PATCH v3 02/10] arm64: dts: rockchip: Add nodes for NPU and its MMU to rk3588s

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Message-ID: <4bd79c88-7da5-4bf0-9300-cfdb296c8919@kernel.org>
Date: Mon, 19 May 2025 08:08:15 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Tomeu Vizoso <tomeu@...euvizoso.net>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Heiko Stuebner <heiko@...ech.de>,
 Oded Gabbay <ogabbay@...nel.org>, Jonathan Corbet <corbet@....net>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Sumit Semwal <sumit.semwal@...aro.org>,
 Christian König <christian.koenig@....com>,
 Sebastian Reichel <sebastian.reichel@...labora.com>,
 Nicolas Frattaroli <nicolas.frattaroli@...labora.com>,
 Jeff Hugo <jeff.hugo@....qualcomm.com>
Cc: devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
 dri-devel@...ts.freedesktop.org, linux-doc@...r.kernel.org,
 linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v3 02/10] arm64: dts: rockchip: Add nodes for NPU and its
 MMU to rk3588s

On 16/05/2025 18:53, Tomeu Vizoso wrote:
> See Chapter 36 "RKNN" from the RK3588 TRM (Part 1).
> 
> This is a derivative of NVIDIA's NVDLA, but with its own front-end
> processor.
> 
> The IP is divided in three cores, programmed independently. The first
> core though is special, requiring to be powered on before any of the
> others can be used.
> 
> The IOMMU of the first core is also special in that it has two subunits
> (read/write?) that need to be programmed in sync.
> 
> v2:
> - Have one device for each NPU core (Sebastian Reichel)
> - Have one device for each IOMMU (Sebastian Reichel)
> - Correctly sort nodes (Diederik de Haas)
> - Add rockchip,iommu compatible to IOMMU nodes (Sebastian Reichel)
> 
> v3:
> - Adapt to a split of the register block in the DT bindings (Nicolas
>   Frattaroli)
> 
> Signed-off-by: Tomeu Vizoso <tomeu@...euvizoso.net>
> ---
>  arch/arm64/boot/dts/rockchip/rk3588-base.dtsi | 85 +++++++++++++++++++++++++++
>  1 file changed, 85 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
> index 1e18ad93ba0ebdad31642b88ff0f90ef4e8dc76f..7b961ab838212fad8e4a70390fdc917a828433a9 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
> @@ -1136,6 +1136,91 @@ power-domain@...588_PD_SDMMC {
>  		};
>  	};
>  
> +	rknn_core_top: npu-core@...b0000 {

npu@

> +		compatible = "rockchip,rk3588-rknn-core-top", "rockchip,rknn-core-top";

You never tested this. Test before sending instead of relying on us or
after merging.

Best regards,
Krzysztof