1*c9ccf3a3SEmmanuel Vadot// SPDX-License-Identifier: (GPL-2.0+ OR MIT) 2*c9ccf3a3SEmmanuel Vadot/* 3*c9ccf3a3SEmmanuel Vadot * Copyright 2022 Gateworks Corporation 4*c9ccf3a3SEmmanuel Vadot * 5*c9ccf3a3SEmmanuel Vadot * GW72xx RS232 with RTS/CTS hardware flow control: 6*c9ccf3a3SEmmanuel Vadot * - GPIO4_0 rs485_en needs to be driven low (in-active) 7*c9ccf3a3SEmmanuel Vadot * - UART4_TX becomes RTS 8*c9ccf3a3SEmmanuel Vadot * - UART4_RX becomes CTS 9*c9ccf3a3SEmmanuel Vadot */ 10*c9ccf3a3SEmmanuel Vadot 11*c9ccf3a3SEmmanuel Vadot#include <dt-bindings/gpio/gpio.h> 12*c9ccf3a3SEmmanuel Vadot 13*c9ccf3a3SEmmanuel Vadot#include "imx8mm-pinfunc.h" 14*c9ccf3a3SEmmanuel Vadot 15*c9ccf3a3SEmmanuel Vadot/dts-v1/; 16*c9ccf3a3SEmmanuel Vadot/plugin/; 17*c9ccf3a3SEmmanuel Vadot 18*c9ccf3a3SEmmanuel Vadot&{/} { 19*c9ccf3a3SEmmanuel Vadot compatible = "gw,imx8mm-gw72xx-0x"; 20*c9ccf3a3SEmmanuel Vadot}; 21*c9ccf3a3SEmmanuel Vadot 22*c9ccf3a3SEmmanuel Vadot&gpio4 { 23*c9ccf3a3SEmmanuel Vadot rs485_en { 24*c9ccf3a3SEmmanuel Vadot gpio-hog; 25*c9ccf3a3SEmmanuel Vadot gpios = <0 GPIO_ACTIVE_HIGH>; 26*c9ccf3a3SEmmanuel Vadot output-low; 27*c9ccf3a3SEmmanuel Vadot line-name = "rs485_en"; 28*c9ccf3a3SEmmanuel Vadot }; 29*c9ccf3a3SEmmanuel Vadot}; 30*c9ccf3a3SEmmanuel Vadot 31*c9ccf3a3SEmmanuel Vadot&uart2 { 32*c9ccf3a3SEmmanuel Vadot pinctrl-names = "default"; 33*c9ccf3a3SEmmanuel Vadot pinctrl-0 = <&pinctrl_uart2>; 34*c9ccf3a3SEmmanuel Vadot rts-gpios = <&gpio5 29 GPIO_ACTIVE_LOW>; 35*c9ccf3a3SEmmanuel Vadot cts-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>; 36*c9ccf3a3SEmmanuel Vadot uart-has-rtscts; 37*c9ccf3a3SEmmanuel Vadot status = "okay"; 38*c9ccf3a3SEmmanuel Vadot}; 39*c9ccf3a3SEmmanuel Vadot 40*c9ccf3a3SEmmanuel Vadot&uart4 { 41*c9ccf3a3SEmmanuel Vadot status = "disabled"; 42*c9ccf3a3SEmmanuel Vadot}; 43*c9ccf3a3SEmmanuel Vadot 44*c9ccf3a3SEmmanuel Vadot&iomuxc { 45*c9ccf3a3SEmmanuel Vadot pinctrl_uart2: uart2grp { 46*c9ccf3a3SEmmanuel Vadot fsl,pins = < 47*c9ccf3a3SEmmanuel Vadot MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 48*c9ccf3a3SEmmanuel Vadot MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 49*c9ccf3a3SEmmanuel Vadot MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 50*c9ccf3a3SEmmanuel Vadot MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28 0x140 51*c9ccf3a3SEmmanuel Vadot >; 52*c9ccf3a3SEmmanuel Vadot }; 53*c9ccf3a3SEmmanuel Vadot}; 54