linux-kernel - Re: [PATCH v7 4/7] ARM: dts: sun8i: v3s: Add support for the ISP

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Date:   Wed, 13 Dec 2023 21:09:32 +0100
From:   Jernej Škrabec <jernej.skrabec@...il.com>
To:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Samuel Holland <samuel@...lland.org>,
        Maxime Ripard <mripard@...nel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH v7 4/7] ARM: dts: sun8i: v3s: Add support for the ISP

On Wednesday, November 22, 2023 3:14:22 PM CET Paul Kocialkowski wrote:
> The V3s (and related platforms) come with an instance of the A31 ISP.
> Even though it is very close to the A31 ISP, it is not exactly
> register-compatible and a dedicated compatible only is used as a
> result.
> 
> Just like most other blocks of the camera pipeline, the ISP uses
> the common CSI bus, module and ram clock as well as reset.
> 
> A port connection to the ISP is added to CSI0 for convenience since
> CSI0 serves for MIPI CSI-2 interface support, which is likely to
> receive raw data that will need to be processed by the ISP to produce
> a final image.
> 
> The interconnects property is used to inherit the proper DMA offset.
> 
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> ---
>  arch/arm/boot/dts/allwinner/sun8i-v3s.dtsi | 35 ++++++++++++++++++++++
>  1 file changed, 35 insertions(+)
> 
> diff --git a/arch/arm/boot/dts/allwinner/sun8i-v3s.dtsi b/arch/arm/boot/dts/allwinner/sun8i-v3s.dtsi
> index d57612023aa4..1a1dcd36cba4 100644
> --- a/arch/arm/boot/dts/allwinner/sun8i-v3s.dtsi
> +++ b/arch/arm/boot/dts/allwinner/sun8i-v3s.dtsi
> @@ -645,6 +645,14 @@ csi0_in_mipi_csi2: endpoint {
>  						remote-endpoint = <&mipi_csi2_out_csi0>;
>  					};
>  				};
> +
> +				port@2 {
> +					reg = <2>;
> +
> +					csi0_out_isp: endpoint {
> +						remote-endpoint = <&isp_in_csi0>;
> +					};
> +				};
>  			};
>  		};
>  
> @@ -703,5 +711,32 @@ csi1: camera@...4000 {
>  			resets = <&ccu RST_BUS_CSI>;
>  			status = "disabled";
>  		};
> +
> +		isp: isp@...8000 {
> +			compatible = "allwinner,sun8i-v3s-isp";
> +			reg = <0x01cb8000 0x1000>;
> +			interrupts = <GIC_SPI 83 IRQ_TYPE_LEVEL_HIGH>;
> +			clocks = <&ccu CLK_BUS_CSI>,
> +				 <&ccu CLK_CSI1_SCLK>,
> +				 <&ccu CLK_DRAM_CSI>;
> +			clock-names = "bus", "mod", "ram";
> +			resets = <&ccu RST_BUS_CSI>;
> +			interconnects = <&mbus 5>;
> +			interconnect-names = "dma-mem";

Same as in previous patch, interconnects properties are not described in
bindings, please update.

Best regards,
Jernej

> +			status = "disabled";
> +
> +			ports {
> +				#address-cells = <1>;
> +				#size-cells = <0>;
> +
> +				port@0 {
> +					reg = <0>;
> +
> +					isp_in_csi0: endpoint {
> +						remote-endpoint = <&csi0_out_isp>;
> +					};
> +				};
> +			};
> +		};
>  	};
>  };
>