53 lines
965 B
Plaintext
53 lines
965 B
Plaintext
|
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
|
||
|
|
/*
|
||
|
|
* Copyright 2022 Gateworks Corporation
|
||
|
|
*
|
||
|
|
* GW72xx RS232 with RTS/CTS hardware flow control:
|
||
|
|
* - GPIO4_0 rs485_en needs to be driven low (in-active)
|
||
|
|
* - UART4_TX becomes RTS
|
||
|
|
* - UART4_RX becomes CTS
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <dt-bindings/gpio/gpio.h>
|
||
|
|
|
||
|
|
#include "imx8mm-pinfunc.h"
|
||
|
|
|
||
|
|
/dts-v1/;
|
||
|
|
/plugin/;
|
||
|
|
|
||
|
|
&{/} {
|
||
|
|
compatible = "gw,imx8mm-gw72xx-0x";
|
||
|
|
};
|
||
|
|
|
||
|
|
&gpio4 {
|
||
|
|
rs485_en {
|
||
|
|
gpio-hog;
|
||
|
|
gpios = <0 GPIO_ACTIVE_HIGH>;
|
||
|
|
output-low;
|
||
|
|
line-name = "rs485_en";
|
||
|
|
};
|
||
|
|
};
|
||
|
|
|
||
|
|
&uart2 {
|
||
|
|
pinctrl-names = "default";
|
||
|
|
pinctrl-0 = <&pinctrl_uart2>;
|
||
|
|
rts-gpios = <&gpio5 29 GPIO_ACTIVE_LOW>;
|
||
|
|
cts-gpios = <&gpio5 28 GPIO_ACTIVE_LOW>;
|
||
|
|
status = "okay";
|
||
|
|
};
|
||
|
|
|
||
|
|
&uart4 {
|
||
|
|
status = "disabled";
|
||
|
|
};
|
||
|
|
|
||
|
|
&iomuxc {
|
||
|
|
pinctrl_uart2: uart2grp {
|
||
|
|
fsl,pins = <
|
||
|
|
MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140
|
||
|
|
MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140
|
||
|
|
MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140
|
||
|
|
MX8MM_IOMUXC_UART4_RXD_GPIO5_IO28 0x140
|
||
|
|
>;
|
||
|
|
};
|
||
|
|
};
|