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      1 // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
      2 /*
      3  * Copyright 2021 Gateworks Corporation
      4  *
      5  * GW73xx RS485 HD:
      6  *  - GPIO1_0 rs485_term selects on-chip termination
      7  *  - GPIO4_0 rs485_en needs to be driven high (active)
      8  *  - GPIO4_2 rs485_hd needs to be driven high (active)
      9  *  - UART4_TX is DE for RS485 transmitter
     10  *  - RS485_EN needs to be pulled high
     11  *  - RS485_HALF needs to be pulled high
     12  */
     13 
     14 #include <dt-bindings/gpio/gpio.h>
     15 
     16 #include "imx8mm-pinfunc.h"
     17 
     18 /dts-v1/;
     19 /plugin/;
     20 
     21 &{/} {
     22 	compatible = "gw,imx8mm-gw73xx-0x";
     23 };
     24 
     25 &gpio4 {
     26 	rs485-en-hog {
     27 		gpio-hog;
     28 		gpios = <0 GPIO_ACTIVE_HIGH>;
     29 		output-high;
     30 		line-name = "rs485_en";
     31 	};
     32 
     33 	rs485-hd-hog {
     34 		gpio-hog;
     35 		gpios = <2 GPIO_ACTIVE_HIGH>;
     36 		output-high;
     37 		line-name = "rs485_hd";
     38 	};
     39 };
     40 
     41 &uart2 {
     42 	pinctrl-names = "default";
     43 	pinctrl-0 = <&pinctrl_uart2>;
     44 	rts-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>;
     45 	linux,rs485-enabled-at-boot-time;
     46 	status = "okay";
     47 };
     48 
     49 &uart4 {
     50 	status = "disabled";
     51 };
     52 
     53 &iomuxc {
     54 	pinctrl_uart2: uart2grp {
     55 		fsl,pins = <
     56 			MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX     0x140
     57 			MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX     0x140
     58 			MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29	0x140
     59 		>;
     60 	};
     61 };
     62