arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs232.dtso

Source file repositories/reference/linux-study-clean/arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs232.dtso

File Facts

System
Linux kernel
Corpus path
arch/arm64/boot/dts/freescale/imx8mm-phygate-tauri-l-rs232-rs232.dtso
Extension
.dtso
Size
1362 bytes
Lines
68
Domain
Architecture Layer
Bucket
arch/arm64
Inferred role
Architecture Layer: arch/arm64
Status
atlas-only

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (C) 2021 PHYTEC Messtechnik GmbH
 * Author: Jens Lang <j.lang@phytec.de>
 *
 * Tauri-L 2 x RS232:
 *  - GPIO3_20 uart4_rs485_en needs to be driven low (inactive)
 */

#include <dt-bindings/clock/imx8mm-clock.h>
#include <dt-bindings/gpio/gpio.h>
#include "imx8mm-pinfunc.h"

/dts-v1/;
/plugin/;

&gpio3 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_gpio3_hog>;

	uart4-rs485-en-hog {
		gpio-hog;
		gpios = <20 GPIO_ACTIVE_HIGH>;
		output-low;
		line-name = "uart4_rs485_en";
	};
};

/* UART2 - RS232  */
&uart2 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_uart2>;
	assigned-clocks = <&clk IMX8MM_CLK_UART2>;
	assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
	status = "okay";
};

/* UART4 - RS232  */
&uart4 {
	pinctrl-names = "default";
	pinctrl-0 = <&pinctrl_uart4>;
	assigned-clocks = <&clk IMX8MM_CLK_UART4>;
	assigned-clock-parents = <&clk IMX8MM_SYS_PLL1_80M>;
	status = "okay";
};

&iomuxc {
	pinctrl_gpio3_hog: gpio3hoggrp {
		fsl,pins = <
			MX8MM_IOMUXC_SAI5_RXC_GPIO3_IO20	0x49
		>;
	};

	pinctrl_uart2: uart2grp {
		fsl,pins = <
			MX8MM_IOMUXC_UART2_RXD_UART2_DCE_RX	0x00
			MX8MM_IOMUXC_UART2_TXD_UART2_DCE_TX	0x00
		>;
	};

	pinctrl_uart4: uart4grp {
		fsl,pins = <
			MX8MM_IOMUXC_UART4_RXD_UART4_DCE_RX	0x49
			MX8MM_IOMUXC_UART4_TXD_UART4_DCE_TX	0x49
		>;
	};
};

Annotation

Implementation Notes