arch/arm64/boot/dts/freescale/imx8mm-venice-gw72xx-0x-rs232-rts.dtso

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