From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lukasz Majewski Subject: [PATCH] dts: Disable DMA support on the BK4 vf610 device's fsl_lpuart driver Date: Wed, 9 Oct 2019 16:30:32 +0200 Message-ID: <20191009143032.9261-1-lukma@denx.de> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: Sender: linux-kernel-owner@vger.kernel.org To: linux-kernel@vger.kernel.org, Shawn Guo Cc: devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Mark Rutland , Rob Herring , Stefan Agner , Pengutronix Kernel Team , Sascha Hauer , Lukasz Majewski List-Id: devicetree@vger.kernel.org This change disables the DMA support (RX/TX) on the NXP's fsl_lpuart driver - the PIO mode is used instead. This change is necessary for better robustness of BK4's device use cases with many potentially interrupted short serial transfers. Without it the driver hangs when some distortion happens on UART lines. Signed-off-by: Lukasz Majewski --- arch/arm/boot/dts/vf610-bk4.dts | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/arm/boot/dts/vf610-bk4.dts b/arch/arm/boot/dts/vf610-bk4.dts index 0f3870d3b099..ad20f3442d40 100644 --- a/arch/arm/boot/dts/vf610-bk4.dts +++ b/arch/arm/boot/dts/vf610-bk4.dts @@ -259,24 +259,28 @@ &uart0 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart0>; + dma-names = "",""; status = "okay"; }; &uart1 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart1>; + dma-names = "",""; status = "okay"; }; &uart2 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart2>; + dma-names = "",""; status = "okay"; }; &uart3 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_uart3>; + dma-names = "",""; status = "okay"; }; -- 2.20.1