From 34dd7450f1c3dec5149306940fd8253d139e0fef Mon Sep 17 00:00:00 2001
From: Vivian Wang <wangruikang@iscas.ac.cn>
Date: Tue, 17 Jun 2025 13:21:02 +0800
Subject: [PATCH] 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. Devices actually using these translation will
be added in later patches.

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

[1] https://lore.kernel.org/all/CAH1PCMaC+imcMZCFYtRdmH6ge=dPgnANn_GqVfsGRS=+YhyJCw@mail.gmail.com/

Signed-off-by: Vivian Wang <wangruikang@iscas.ac.cn>
Signed-off-by: Linux RISC-V bot <linux.riscv.bot@gmail.com>
---
 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 c0f8c5fca975d7..efefed21b9fa1a 100644
--- a/arch/riscv/boot/dts/spacemit/k1.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -562,5 +562,58 @@
 			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>;
+		};
 	};
 };