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61 lines
1.1 KiB
61 lines
1.1 KiB
// SPDX-License-Identifier: (GPL-2.0+ OR MIT) |
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/* |
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* Copyright 2021 Gateworks Corporation |
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* |
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* GW73xx RS485 HD: |
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* - GPIO1_0 rs485_term selects on-chip termination |
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* - GPIO4_0 rs485_en needs to be driven high (active) |
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* - GPIO4_2 rs485_hd needs to be driven high (active) |
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* - UART4_TX is DE for RS485 transmitter |
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* - RS485_EN needs to be pulled high |
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* - RS485_HALF needs to be pulled high |
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*/ |
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#include <dt-bindings/gpio/gpio.h> |
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#include "imx8mm-pinfunc.h" |
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/dts-v1/; |
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/plugin/; |
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&{/} { |
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compatible = "gw,imx8mm-gw73xx-0x"; |
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}; |
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&gpio4 { |
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rs485_en { |
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gpio-hog; |
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gpios = <0 GPIO_ACTIVE_HIGH>; |
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output-high; |
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line-name = "rs485_en"; |
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}; |
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rs485_hd { |
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gpio-hog; |
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gpios = <2 GPIO_ACTIVE_HIGH>; |
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output-high; |
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line-name = "rs485_hd"; |
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}; |
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}; |
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&uart2 { |
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pinctrl-names = "default"; |
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pinctrl-0 = <&pinctrl_uart2>; |
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rts-gpios = <&gpio5 29 GPIO_ACTIVE_HIGH>; |
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linux,rs485-enabled-at-boot-time; |
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status = "okay"; |
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}; |
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&uart4 { |
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status = "disabled"; |
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}; |
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&iomuxc { |
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pinctrl_uart2: uart2grp { |
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fsl,pins = < |
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MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX 0x140 |
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MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX 0x140 |
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MX8MM_IOMUXC_UART4_TXD_GPIO5_IO29 0x140 |
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>; |
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}; |
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};
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