linux-kernel - [PATCH v8 6/9] ARM: dts: sun8i: v3s: Add support for the ISP

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Message-ID: <20250704154628.3468793-7-paulk@sys-base.io>
Date: Fri,  4 Jul 2025 17:46:23 +0200
From: Paul Kocialkowski <paulk@...-base.io>
To: linux-media@...r.kernel.org,
	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
Cc: Yong Deng <yong.deng@...ewell.com>,
	Paul Kocialkowski <paulk@...-base.io>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen-Yu Tsai <wens@...e.org>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Samuel Holland <samuel@...lland.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Maxime Ripard <mripard@...nel.org>,
	Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: [PATCH v8 6/9] ARM: dts: sun8i: v3s: Add support for the ISP

From: Paul Kocialkowski <paul.kocialkowski@...tlin.com>

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 bfe02295f45d..f63534a02706 100644
--- a/arch/arm/boot/dts/allwinner/sun8i-v3s.dtsi
+++ b/arch/arm/boot/dts/allwinner/sun8i-v3s.dtsi
@@ -695,6 +695,14 @@ csi0_in_mipi_csi2: endpoint {
 						remote-endpoint = <&mipi_csi2_out_csi0>;
 					};
 				};
+
+				port@2 {
+					reg = <2>;
+
+					csi0_out_isp: endpoint {
+						remote-endpoint = <&isp_in_csi0>;
+					};
+				};
 			};
 		};
 
@@ -753,5 +761,32 @@ 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_CSI_SCLK>,
+				 <&ccu CLK_DRAM_CSI>;
+			clock-names = "bus", "mod", "ram";
+			resets = <&ccu RST_BUS_CSI>;
+			interconnects = <&mbus 5>;
+			interconnect-names = "dma-mem";
+			status = "disabled";
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@0 {
+					reg = <0>;
+
+					isp_in_csi0: endpoint {
+						remote-endpoint = <&csi0_out_isp>;
+					};
+				};
+			};
+		};
 	};
 };
-- 
2.49.0