162306a36Sopenharmony_ci// SPDX-License-Identifier: (GPL-2.0+ OR MIT) 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Copyright 2021 Gateworks Corporation 462306a36Sopenharmony_ci * 562306a36Sopenharmony_ci * GW73xx RS485 HD: 662306a36Sopenharmony_ci * - GPIO1_0 rs485_term selects on-chip termination 762306a36Sopenharmony_ci * - GPIO4_0 rs485_en needs to be driven high (active) 862306a36Sopenharmony_ci * - GPIO4_2 rs485_hd needs to be driven high (active) 962306a36Sopenharmony_ci * - UART4_TX is DE for RS485 transmitter 1062306a36Sopenharmony_ci * - RS485_EN needs to be pulled high 1162306a36Sopenharmony_ci * - RS485_HALF needs to be pulled high 1262306a36Sopenharmony_ci */ 1362306a36Sopenharmony_ci 1462306a36Sopenharmony_ci#include <dt-bindings/gpio/gpio.h> 1562306a36Sopenharmony_ci 1662306a36Sopenharmony_ci#include "imx8mm-pinfunc.h" 1762306a36Sopenharmony_ci 1862306a36Sopenharmony_ci/dts-v1/; 1962306a36Sopenharmony_ci/plugin/; 2062306a36Sopenharmony_ci 2162306a36Sopenharmony_ci&{/} { 2262306a36Sopenharmony_ci compatible = "gw,imx8mm-gw73xx-0x"; 2362306a36Sopenharmony_ci}; 2462306a36Sopenharmony_ci 2562306a36Sopenharmony_ci&gpio4 { 2662306a36Sopenharmony_ci rs485_en { 2762306a36Sopenharmony_ci gpio-hog; 2862306a36Sopenharmony_ci gpios = <0 GPIO_ACTIVE_HIGH>; 2962306a36Sopenharmony_ci output-high; 3062306a36Sopenharmony_ci line-name = "rs485_en"; 3162306a36Sopenharmony_ci }; 3262306a36Sopenharmony_ci 3362306a36Sopenharmony_ci rs485_hd { 3462306a36Sopenharmony_ci gpio-hog; 3562306a36Sopenharmony_ci gpios = <2 GPIO_ACTIVE_HIGH>; 3662306a36Sopenharmony_ci output-high; 3762306a36Sopenharmony_ci line-name = "rs485_hd"; 3862306a36Sopenharmony_ci }; 3962306a36Sopenharmony_ci}; 4062306a36Sopenharmony_ci 4162306a36Sopenharmony_ci&uart2 { 4262306a36Sopenharmony_ci pinctrl-names = "default"; 4362306a36Sopenharmony_ci pinctrl-0 = <&pinctrl_uart2>; 4462306a36Sopenharmony_ci rts-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>; 4562306a36Sopenharmony_ci linux,rs485-enabled-at-boot-time; 4662306a36Sopenharmony_ci status = "okay"; 4762306a36Sopenharmony_ci}; 4862306a36Sopenharmony_ci 4962306a36Sopenharmony_ci&uart4 { 5062306a36Sopenharmony_ci status = "disabled"; 5162306a36Sopenharmony_ci}; 5262306a36Sopenharmony_ci 5362306a36Sopenharmony_ci&iomuxc { 5462306a36Sopenharmony_ci pinctrl_uart2: uart2grp { 5562306a36Sopenharmony_ci fsl,pins = < 5662306a36Sopenharmony_ci MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 5762306a36Sopenharmony_ci MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 5862306a36Sopenharmony_ci MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 5962306a36Sopenharmony_ci >; 6062306a36Sopenharmony_ci }; 6162306a36Sopenharmony_ci}; 62