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// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
* Copyright 2021 Gateworks Corporation
*
* GW73xx RS422 (RS485 full duplex):
* - GPIO1_0 rs485_term selects on-chip termination
* - GPIO4_0 rs485_en needs to be driven high (active)
* - GPIO4_2 rs485_hd needs to be driven low (in-active)
* - UART4_TX is DE for RS485 transmitter
* - RS485_EN needs to be pulled high
* - RS485_HALF needs to be low
*/
#include <dt-bindings/gpio/gpio.h>
#include "imx8mm-pinfunc.h"
/dts-v1/;
/plugin/;
&{/} {
compatible = "gw,imx8mm-gw73xx-0x";
};
&gpio4 {
rs485_en {
gpio-hog;
gpios = <0 GPIO_ACTIVE_HIGH>;
output-high;
line-name = "rs485_en";
};
rs485_hd {
gpio-hog;
gpios = <2 GPIO_ACTIVE_HIGH>;
output-low;
line-name = "rs485_hd";
};
};
&uart2 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_uart2>;
rts-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>;
linux,rs485-enabled-at-boot-time;
status = "okay";
};
&uart4 {
status = "disabled";
};
&iomuxc {
pinctrl_uart2: uart2grp {
fsl,pins = <
MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140
MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140
MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140
>;
};
};
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