1*8bab661aSEmmanuel Vadot// SPDX-License-Identifier: (GPL-2.0+ OR MIT) 2*8bab661aSEmmanuel Vadot/* 3*8bab661aSEmmanuel Vadot * Copyright 2022 Gateworks Corporation 4*8bab661aSEmmanuel Vadot * 5*8bab661aSEmmanuel Vadot * GW73xx RS232 with RTS/CTS hardware flow control: 6*8bab661aSEmmanuel Vadot * - GPIO4_0 rs485_en needs to be driven low (in-active) 7*8bab661aSEmmanuel Vadot * - UART4_TX becomes RTS 8*8bab661aSEmmanuel Vadot * - UART4_RX becomes CTS 9*8bab661aSEmmanuel Vadot */ 10*8bab661aSEmmanuel Vadot 11*8bab661aSEmmanuel Vadot#include <dt-bindings/gpio/gpio.h> 12*8bab661aSEmmanuel Vadot 13*8bab661aSEmmanuel Vadot#include "imx8mm-pinfunc.h" 14*8bab661aSEmmanuel Vadot 15*8bab661aSEmmanuel Vadot/dts-v1/; 16*8bab661aSEmmanuel Vadot/plugin/; 17*8bab661aSEmmanuel Vadot 18*8bab661aSEmmanuel Vadot&{/} { 19*8bab661aSEmmanuel Vadot compatible = "gw,imx8mm-gw73xx-0x"; 20*8bab661aSEmmanuel Vadot}; 21*8bab661aSEmmanuel Vadot 22*8bab661aSEmmanuel Vadot&gpio4 { 23*8bab661aSEmmanuel Vadot rs485_en { 24*8bab661aSEmmanuel Vadot gpio-hog; 25*8bab661aSEmmanuel Vadot gpios = <0 GPIO_ACTIVE_HIGH>; 26*8bab661aSEmmanuel Vadot output-low; 27*8bab661aSEmmanuel Vadot line-name = "rs485_en"; 28*8bab661aSEmmanuel Vadot }; 29*8bab661aSEmmanuel Vadot}; 30*8bab661aSEmmanuel Vadot 31*8bab661aSEmmanuel Vadot&uart2 { 32*8bab661aSEmmanuel Vadot pinctrl-names = "default"; 33*8bab661aSEmmanuel Vadot pinctrl-0 = <&pinctrl_uart2>; 34*8bab661aSEmmanuel Vadot rts-gpios = <&gpio5 29 GPIO_ACTIVE_LOW>; 35*8bab661aSEmmanuel Vadot cts-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>; 36*8bab661aSEmmanuel Vadot status = "okay"; 37*8bab661aSEmmanuel Vadot}; 38*8bab661aSEmmanuel Vadot 39*8bab661aSEmmanuel Vadot&uart4 { 40*8bab661aSEmmanuel Vadot status = "disabled"; 41*8bab661aSEmmanuel Vadot}; 42*8bab661aSEmmanuel Vadot 43*8bab661aSEmmanuel Vadot&iomuxc { 44*8bab661aSEmmanuel Vadot pinctrl_uart2: uart2grp { 45*8bab661aSEmmanuel Vadot fsl,pins = < 46*8bab661aSEmmanuel Vadot MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 47*8bab661aSEmmanuel Vadot MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 48*8bab661aSEmmanuel Vadot MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 49*8bab661aSEmmanuel Vadot MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28 0x140 50*8bab661aSEmmanuel Vadot >; 51*8bab661aSEmmanuel Vadot }; 52*8bab661aSEmmanuel Vadot}; 53