The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/src/arm64/freescale/imx8mm-venice-gw72xx-0x-rs232-rts.dts

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    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         uart-has-rtscts;
   37         status = "okay";
   38 };
   39 
   40 &uart4 {
   41         status = "disabled";
   42 };
   43 
   44 &iomuxc {
   45         pinctrl_uart2: uart2grp {
   46                 fsl,pins = <
   47                         MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX     0x140
   48                         MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX     0x140
   49                         MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29       0x140
   50                         MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28       0x140
   51                 >;
   52         };
   53 };

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