162306a36Sopenharmony_ci// SPDX-License-Identifier: (GPL-2.0+ OR MIT) 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Copyright 2022 Gateworks Corporation 462306a36Sopenharmony_ci * 562306a36Sopenharmony_ci * GW72xx RS232 with RTS/CTS hardware flow control: 662306a36Sopenharmony_ci * - GPIO4_0 rs485_en needs to be driven low (in-active) 762306a36Sopenharmony_ci * - UART4_TX becomes RTS 862306a36Sopenharmony_ci * - UART4_RX becomes CTS 962306a36Sopenharmony_ci */ 1062306a36Sopenharmony_ci 1162306a36Sopenharmony_ci#include <dt-bindings/gpio/gpio.h> 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci#include "imx8mm-pinfunc.h" 1462306a36Sopenharmony_ci 1562306a36Sopenharmony_ci/dts-v1/; 1662306a36Sopenharmony_ci/plugin/; 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ci&{/} { 1962306a36Sopenharmony_ci compatible = "gw,imx8mm-gw72xx-0x"; 2062306a36Sopenharmony_ci}; 2162306a36Sopenharmony_ci 2262306a36Sopenharmony_ci&gpio4 { 2362306a36Sopenharmony_ci rs485_en { 2462306a36Sopenharmony_ci gpio-hog; 2562306a36Sopenharmony_ci gpios = <0 GPIO_ACTIVE_HIGH>; 2662306a36Sopenharmony_ci output-low; 2762306a36Sopenharmony_ci line-name = "rs485_en"; 2862306a36Sopenharmony_ci }; 2962306a36Sopenharmony_ci}; 3062306a36Sopenharmony_ci 3162306a36Sopenharmony_ci&uart2 { 3262306a36Sopenharmony_ci pinctrl-names = "default"; 3362306a36Sopenharmony_ci pinctrl-0 = <&pinctrl_uart2>; 3462306a36Sopenharmony_ci rts-gpios = <&gpio5 29 GPIO_ACTIVE_LOW>; 3562306a36Sopenharmony_ci cts-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>; 3662306a36Sopenharmony_ci status = "okay"; 3762306a36Sopenharmony_ci}; 3862306a36Sopenharmony_ci 3962306a36Sopenharmony_ci&uart4 { 4062306a36Sopenharmony_ci status = "disabled"; 4162306a36Sopenharmony_ci}; 4262306a36Sopenharmony_ci 4362306a36Sopenharmony_ci&iomuxc { 4462306a36Sopenharmony_ci pinctrl_uart2: uart2grp { 4562306a36Sopenharmony_ci fsl,pins = < 4662306a36Sopenharmony_ci MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 4762306a36Sopenharmony_ci MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 4862306a36Sopenharmony_ci MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 4962306a36Sopenharmony_ci MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28 0x140 5062306a36Sopenharmony_ci >; 5162306a36Sopenharmony_ci }; 5262306a36Sopenharmony_ci}; 53