1*4c33cb31SAndrew Davis// SPDX-License-Identifier: (GPL-2.0+ OR MIT) 2*4c33cb31SAndrew Davis/* 3*4c33cb31SAndrew Davis * Copyright 2022 Gateworks Corporation 4*4c33cb31SAndrew Davis * 5*4c33cb31SAndrew Davis * GW72xx RS232 with RTS/CTS hardware flow control: 6*4c33cb31SAndrew Davis * - GPIO4_0 rs485_en needs to be driven low (in-active) 7*4c33cb31SAndrew Davis * - UART4_TX becomes RTS 8*4c33cb31SAndrew Davis * - UART4_RX becomes CTS 9*4c33cb31SAndrew Davis */ 10*4c33cb31SAndrew Davis 11*4c33cb31SAndrew Davis#include <dt-bindings/gpio/gpio.h> 12*4c33cb31SAndrew Davis 13*4c33cb31SAndrew Davis#include "imx8mm-pinfunc.h" 14*4c33cb31SAndrew Davis 15*4c33cb31SAndrew Davis/dts-v1/; 16*4c33cb31SAndrew Davis/plugin/; 17*4c33cb31SAndrew Davis 18*4c33cb31SAndrew Davis&{/} { 19*4c33cb31SAndrew Davis compatible = "gw,imx8mm-gw72xx-0x"; 20*4c33cb31SAndrew Davis}; 21*4c33cb31SAndrew Davis 22*4c33cb31SAndrew Davis&gpio4 { 23*4c33cb31SAndrew Davis rs485_en { 24*4c33cb31SAndrew Davis gpio-hog; 25*4c33cb31SAndrew Davis gpios = <0 GPIO_ACTIVE_HIGH>; 26*4c33cb31SAndrew Davis output-low; 27*4c33cb31SAndrew Davis line-name = "rs485_en"; 28*4c33cb31SAndrew Davis }; 29*4c33cb31SAndrew Davis}; 30*4c33cb31SAndrew Davis 31*4c33cb31SAndrew Davis&uart2 { 32*4c33cb31SAndrew Davis pinctrl-names = "default"; 33*4c33cb31SAndrew Davis pinctrl-0 = <&pinctrl_uart2>; 34*4c33cb31SAndrew Davis rts-gpios = <&gpio5 29 GPIO_ACTIVE_LOW>; 35*4c33cb31SAndrew Davis cts-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>; 36*4c33cb31SAndrew Davis status = "okay"; 37*4c33cb31SAndrew Davis}; 38*4c33cb31SAndrew Davis 39*4c33cb31SAndrew Davis&uart4 { 40*4c33cb31SAndrew Davis status = "disabled"; 41*4c33cb31SAndrew Davis}; 42*4c33cb31SAndrew Davis 43*4c33cb31SAndrew Davis&iomuxc { 44*4c33cb31SAndrew Davis pinctrl_uart2: uart2grp { 45*4c33cb31SAndrew Davis fsl,pins = < 46*4c33cb31SAndrew Davis MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 47*4c33cb31SAndrew Davis MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 48*4c33cb31SAndrew Davis MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 49*4c33cb31SAndrew Davis MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28 0x140 50*4c33cb31SAndrew Davis >; 51*4c33cb31SAndrew Davis }; 52*4c33cb31SAndrew Davis}; 53