linux-kernel - [PATCH 0/2] arm64: dts: rockchip: fix dma and pinctrl defs

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Message-ID: <20250917114932.25994-1-lists@wildgooses.com>
Date: Wed, 17 Sep 2025 11:49:29 +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 0/2] arm64: dts: rockchip: fix dma and pinctrl defs

The default pinctrl definitions for the Radxa Zero 3W don't match the
datasheet. Possibly few people enable extra UARTs and hence it wasn't
noticed? I needed all 5 UARTs for a project and the first patch corrects
the pinctrl defs. Without this patch, enabling the extra UARTs causes
issues such as the MMC devices disappearing, due to collisions.

Second patch adds a dma-names property, which appears to be a
pre-requisite for enabling DMA on the UARTs. I've applied this to the
base rk356x-base.dtsi as it seems like a change that should apply to all
SOMs? However, I confess ignorance in this area, so could I ask for a
second opinion before anyone applies this?  It's tested on my Zero 3W
board and appears to function correctly and DMA is reported as enabled.

Ed Wildgoose (2):
  arm64: dts: rockchip: correct uart mux for Radxa ZERO 3
  rockchip: dts: Enable UART DMA by adding default dma-names property

 .../boot/dts/rockchip/rk3566-radxa-zero-3.dtsi    | 15 +++++++++++++++
 arch/arm64/boot/dts/rockchip/rk356x-base.dtsi     |  9 +++++++++
 2 files changed, 24 insertions(+)

-- 
2.49.0