linux-kernel - [PATCH 0/2] Disable DMA on secondary UART on PX30 Ringneck

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Message-ID: <20250121092255.3108495-1-lukasz.czechowski@thaumatec.com>
Date: Tue, 21 Jan 2025 10:22:53 +0100
From: Lukasz Czechowski <lukasz.czechowski@...umatec.com>
To: linux-arm-kernel@...ts.infradead.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	heiko@...ech.de,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: quentin.schulz@...rry.de,
	Lukasz Czechowski <lukasz.czechowski@...umatec.com>
Subject: [PATCH 0/2] Disable DMA on secondary UART on PX30 Ringneck

The PX30-uQ7 (Ringneck) SoM has two external UARTs, connected to
uart0 and uart5 controllers on the PX30 SoC. The uart5 does not
expose RTS/CTS pins on the Q7 connector, as they are used for
different purposes. It was observed that UART controllers without
hardware flow controller behave unstable if the DMA is enabled.
This patch series moves the pinctrl-0 to SoM dtsi file and uses
/delete-property/ to remove DMA from this UART controller.

Lukasz Czechowski (2):
  arm64: dts: rockchip: Move uart5 pin configuration to SoM dtsi
  arm64: dts: rockchip: Disable DMA for uart5 on px30-ringneck

 arch/arm64/boot/dts/rockchip/px30-ringneck-haikou.dts | 1 -
 arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi       | 6 ++++++
 2 files changed, 6 insertions(+), 1 deletion(-)

-- 
2.43.0