1// SPDX-License-Identifier: (GPL-2.0+ OR MIT) 2/* 3 * Copyright 2022 Gateworks Corporation 4 * 5 * GW72xx RS232 with RTS/CTS hardware flow control: 6 * - GPIO4_0 rs485_en needs to be driven low (in-active) 7 * - UART4_TX becomes RTS 8 * - UART4_RX becomes CTS 9 */ 10 11#include <dt-bindings/gpio/gpio.h> 12 13#include "imx8mm-pinfunc.h" 14 15/dts-v1/; 16/plugin/; 17 18&gpio4 { 19 rs485-en-hog { 20 gpio-hog; 21 gpios = <0 GPIO_ACTIVE_HIGH>; 22 output-low; 23 line-name = "rs485_en"; 24 }; 25}; 26 27&uart2 { 28 pinctrl-names = "default"; 29 pinctrl-0 = <&pinctrl_uart2>; 30 rts-gpios = <&gpio5 29 GPIO_ACTIVE_LOW>; 31 cts-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>; 32 status = "okay"; 33}; 34 35&uart4 { 36 status = "disabled"; 37}; 38 39&iomuxc { 40 pinctrl_uart2: uart2grp { 41 fsl,pins = < 42 MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 43 MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 44 MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 45 MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28 0x140 46 >; 47 }; 48}; 49