0001 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
0002 /*
0003 * Copyright 2022 Gateworks Corporation
0004 *
0005 * GW72xx RS232 with RTS/CTS hardware flow control:
0006 * - GPIO4_0 rs485_en needs to be driven low (in-active)
0007 * - UART4_TX becomes RTS
0008 * - UART4_RX becomes CTS
0009 */
0010
0011 #include <dt-bindings/gpio/gpio.h>
0012
0013 #include "imx8mm-pinfunc.h"
0014
0015 /dts-v1/;
0016 /plugin/;
0017
0018 &{/} {
0019 compatible = "gw,imx8mm-gw72xx-0x";
0020 };
0021
0022 &gpio4 {
0023 rs485_en {
0024 gpio-hog;
0025 gpios = <0 GPIO_ACTIVE_HIGH>;
0026 output-low;
0027 line-name = "rs485_en";
0028 };
0029 };
0030
0031 &uart2 {
0032 pinctrl-names = "default";
0033 pinctrl-0 = <&pinctrl_uart2>;
0034 rts-gpios = <&gpio5 29 GPIO_ACTIVE_LOW>;
0035 cts-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>;
0036 uart-has-rtscts;
0037 status = "okay";
0038 };
0039
0040 &uart4 {
0041 status = "disabled";
0042 };
0043
0044 &iomuxc {
0045 pinctrl_uart2: uart2grp {
0046 fsl,pins = <
0047 MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140
0048 MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140
0049 MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140
0050 MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28 0x140
0051 >;
0052 };
0053 };
