linux-kernel - [PATCH net-next v2 3/6] riscv: dts: Add network-bus dma-ranges for SpacemiT K1

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Message-Id: <20250618-net-k1-emac-v2-3-94f5f07227a8@iscas.ac.cn>
Date: Wed, 18 Jun 2025 11:40:48 +0800
From: Vivian Wang <wangruikang@...as.ac.cn>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Yixun Lan <dlan@...too.org>, 
 Vivian Wang <wangruikang@...as.ac.cn>, 
 Philipp Zabel <p.zabel@...gutronix.de>, 
 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>, Lukas Bulwahn <lukas.bulwahn@...hat.com>, 
 Geert Uytterhoeven <geert+renesas@...der.be>, 
 Parthiban Veerasooran <Parthiban.Veerasooran@...rochip.com>, 
 netdev@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-riscv@...ts.infradead.org, spacemit@...ts.linux.dev, 
 linux-kernel@...r.kernel.org
Subject: [PATCH net-next v2 3/6] riscv: dts: Add network-bus dma-ranges for
 SpacemiT K1

The SpacemiT K1 has various static translations of DMA accesses. Add one
of these translations, namely network-bus, as a simple-bus node with
dma-ranges. Child nodes of network-bus will come in later patches.

The node is named "network-bus" in consensus with SpacemiT [1].

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

Signed-off-by: Vivian Wang <wangruikang@...as.ac.cn>
---
 arch/riscv/boot/dts/spacemit/k1.dtsi | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/riscv/boot/dts/spacemit/k1.dtsi b/arch/riscv/boot/dts/spacemit/k1.dtsi
index de403bda2b878c60d9eb5b4d8d336e5c52498159..b1b87ce1ab70faa8fb61fb27bc1845fe40b35561 100644
--- a/arch/riscv/boot/dts/spacemit/k1.dtsi
+++ b/arch/riscv/boot/dts/spacemit/k1.dtsi
@@ -580,5 +580,14 @@ sec_uart1: serial@...12000 {
 			reg-io-width = <4>;
 			status = "reserved"; /* for TEE usage */
 		};
+
+		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>;
+		};
 	};
 };

-- 
2.49.0