linux-kernel - [PATCH 2/2] rockchip: dts: Enable UART DMA by adding default dma-names property

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Message-ID: <20250918093246.15623-3-lists@wildgooses.com>
Date: Thu, 18 Sep 2025 09:32:46 +0000
From: Ed Wildgoose <lists@...dgooses.com>
To: Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Ed Wildgoose <lists@...dgooses.com>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] rockchip: dts: Enable UART DMA by adding default dma-names property

Kernel appears to need a dma-names set for DMA to actually enable. Set a
default dma-names property for all UARTs defined in the board
definition: rk3566-radxa-zero-3.dtsi

This is tested on a Radxa Zero 3W (which has 5x UARTs) and removes the
warnings and enables DMA on this platform

Signed-off-by: Ed Wildgoose <lists@...dgooses.com>
---
 arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi b/arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi
index e644bfc9c..fc26a4a52 100644
--- a/arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3566-radxa-zero-3.dtsi
@@ -488,21 +488,29 @@ &tsadc {
 	status = "okay";
 };
 
+&uart1 {
+	dma-names = "tx", "rx";
+};
+
 &uart2 {
+	dma-names = "tx", "rx";
 	status = "okay";
 };
 
 &uart4{
+	dma-names = "tx", "rx";
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart4m1_xfer>;
 };
 
 &uart5 {
+	dma-names = "tx", "rx";
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart5m1_xfer>;
 };
 
 &uart9 {
+	dma-names = "tx", "rx";
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart9m1_xfer>;
 };
-- 
2.49.0