linux-kernel - [PATCH 1/3] riscv: dts: spacemit: Add DMA translation buses for K1

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Message-Id: <20250623-k1-dma-buses-rfc-wip-v1-1-c0144082061f@iscas.ac.cn>
Date: Mon, 23 Jun 2025 18:04:16 +0800
From: Vivian Wang <wangruikang@...as.ac.cn>
To: Yixun Lan <dlan@...too.org>, Guodong Xu <guodong@...cstar.com>, 
 Ze Huang <huangze@...t.edu.cn>, Alex Elder <elder@...cstar.com>, 
 spacemit@...ts.linux.dev, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Paul Walmsley <paul.walmsley@...ive.com>, 
 Palmer Dabbelt <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>, 
 Alexandre Ghiti <alex@...ti.fr>
Cc: Vivian Wang <uwu@...m.page>, devicetree@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Vivian Wang <wangruikang@...as.ac.cn>
Subject: [PATCH 1/3] riscv: dts: spacemit: Add DMA translation buses for K1

The SpacemiT K1 has various static translations of DMA accesses. Add
these as simple-bus nodes with dma-ranges. Devices actually using these
translations will be added to or moved inside the bus nodes in later
patches.

The bus names are assigned according to consensus with SpacemiT [1].

Link: https://lore.kernel.org/r/CAH1PCMaC+imcMZCFYtRdmH6ge=dPgnANn_GqVfsGRS=+YhyJCw@mail.gmail.com [1]
Signed-off-by: Vivian Wang <wangruikang@...as.ac.cn>
---
 arch/riscv/boot/dts/spacemit/k1.dtsi | 53 ++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
index 14097f1f6f447bd33ff3aaa07382d27ca8e59a48..99c76997b367f733c9dda2c30dd85817294ef9b7 100644
--- a/arch/riscv/boot/dts/spacemit/k1.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -571,5 +571,58 @@ sec_uart1: serial@...12000 {
 			reg-io-width = <4>;
 			status = "reserved"; /* for TEE usage */
 		};
+
+		camera-bus {
+			compatible = "simple-bus";
+			ranges;
+			#address-cells = <2>;
+			#size-cells = <2>;
+			dma-ranges = <0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>,
+				     <0x0 0x80000000 0x1 0x00000000 0x1 0x80000000>;
+		};
+
+		dma-bus {
+			compatible = "simple-bus";
+			ranges;
+			#address-cells = <2>;
+			#size-cells = <2>;
+			dma-ranges = <0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>,
+				     <0x1 0x00000000 0x1 0x80000000 0x3 0x00000000>;
+		};
+
+		multimedia-bus {
+			compatible = "simple-bus";
+			ranges;
+			#address-cells = <2>;
+			#size-cells = <2>;
+			dma-ranges = <0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>,
+				     <0x0 0x80000000 0x1 0x00000000 0x3 0x80000000>;
+		};
+
+		network-bus {
+			compatible = "simple-bus";
+			ranges;
+			#address-cells = <2>;
+			#size-cells = <2>;
+			dma-ranges = <0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>,
+				     <0x0 0x80000000 0x1 0x00000000 0x0 0x80000000>;
+		};
+
+		pcie-bus {
+			compatible = "simple-bus";
+			ranges;
+			#address-cells = <2>;
+			#size-cells = <2>;
+			dma-ranges = <0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>,
+				     <0x0 0xb8000000 0x1 0x38000000 0x3 0x48000000>;
+		};
+
+		storage-bus {
+			compatible = "simple-bus";
+			ranges;
+			#address-cells = <2>;
+			#size-cells = <2>;
+			dma-ranges = <0x0 0x00000000 0x0 0x00000000 0x0 0x80000000>;
+		};
 	};
 };

-- 
2.49.0