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ARM: dts: Disable DMA support on the BK4 vf610 device's fsl_lpuart

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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 <lukma@denx.de>
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Lukasz Majewski 2019-10-10 11:08:02 +02:00 committed by Shawn Guo
parent 069de7bba5
commit 0f3a10687b
1 changed files with 4 additions and 0 deletions
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4
arch/arm/boot/dts/vf610-bk4.dts
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@ -259,24 +259,28 @@
&uart0 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart0>;
/delete-property/dma-names;
status = "okay";
};
&uart1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart1>;
/delete-property/dma-names;
status = "okay";
};
&uart2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart2>;
/delete-property/dma-names;
status = "okay";
};
&uart3 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart3>;
/delete-property/dma-names;
status = "okay";
};