arch/arm/dts/imx8mp-dhcom-drc02.dts

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (C) 2024 Marek Vasut <marex@denx.de>
 *
 * DHCOM iMX8MP variant:
 * DHCM-iMX8ML8-C160-R204-F1638-SPI16-E2-CAN2-RTC-I-01D2
 * DHCOM PCB number: 660-100 or newer
 * DRC02 PCB number: 568-100 or newer
 */

/dts-v1/;

#include <dt-bindings/leds/common.h>
#include <dt-bindings/phy/phy-imx8-pcie.h>
#include "imx8mp-dhcom-som.dtsi"

/ {
	model = "DH electronics i.MX8M Plus DHCOM on DRC02";
	compatible = "dh,imx8mp-dhcom-drc02", "dh,imx8mp-dhcom-som",
		     "fsl,imx8mp";

	chosen {
		stdout-path = &uart1;
	};
};

&eqos {	/* First ethernet */
	pinctrl-0 = <&pinctrl_eqos_rmii>;
	phy-handle = <&ethphy0f>;
	phy-mode = "rmii";

	assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_266M>,
				 <&clk IMX8MP_SYS_PLL2_100M>,
				 <&clk IMX8MP_SYS_PLL2_50M>;
	assigned-clock-rates = <0>, <100000000>, <50000000>;
};

&ethphy0g {	/* Micrel KSZ9131RNXI */
	status = "disabled";
};

&ethphy0f {	/* SMSC LAN8740Ai */
	status = "okay";
};

&fec {	/* Second ethernet */
	pinctrl-0 = <&pinctrl_fec_rmii>;
	phy-handle = <&ethphy1f>;
	phy-mode = "rmii";
	status = "okay";

	assigned-clock-parents = <&clk IMX8MP_SYS_PLL1_266M>,
				 <&clk IMX8MP_SYS_PLL2_100M>,
				 <&clk IMX8MP_SYS_PLL2_50M>,
				 <&clk IMX8MP_SYS_PLL2_50M>;
	assigned-clock-rates = <0>, <100000000>, <50000000>, <0>;
};

&ethphy1f {	/* SMSC LAN8740Ai */
	status = "okay";
};

&flexcan1 {
	status = "okay";
};

&flexcan2 {
	status = "okay";
};

&gpio1 {
	gpio-line-names =
		"DRC02-In1", "", "", "", "", "DHCOM-I", "DRC02-HW2", "DRC02-HW0",
		"DHCOM-B", "DHCOM-A", "", "DHCOM-H", "", "", "", "",
		"", "", "", "", "", "", "", "",
		"", "", "", "", "", "", "", "";

	/*
	 * NOTE: On DRC02, the RS485_RX_En is controlled by a separate
	 * GPIO line, however the i.MX8 UART driver assumes RX happens
	 * during TX anyway and that it only controls drive enable DE
	 * line. Hence, the RX is always enabled here.
	 */
	rs485-rx-en-hog {
		gpio-hog;
		gpios = <13 0>; /* GPIO Q */
		line-name = "rs485-rx-en";
		output-low;
	};
};

&gpio2 {
	gpio-line-names =
		"", "", "", "", "", "", "", "",
		"DHCOM-O", "DHCOM-N", "", "SOM-HW1", "", "", "", "",
		"", "", "", "", "DRC02-In2", "", "", "",
		"", "", "", "", "", "", "", "";
};

&gpio3 {
	gpio-line-names =
		"", "", "", "", "", "", "", "",
		"", "", "", "", "", "", "SOM-HW0", "",
		"", "", "", "", "", "", "SOM-MEM0", "SOM-MEM1",
		"SOM-MEM2", "SOM-HW2", "", "", "", "", "", "";
};

&gpio4 {
	gpio-line-names =
		"", "", "", "", "", "", "", "",
		"", "", "", "", "", "", "", "",
		"", "", "", "SOM-HW1", "", "", "", "",
		"", "", "", "DRC02-Out2", "", "", "", "";
};

&gpio5 {
	gpio-line-names =
		"", "", "DHCOM-C", "", "", "", "", "",
		"", "", "", "", "", "", "", "",
		"", "", "", "", "", "", "DHCOM-E", "DRC02-Out1",
		"", "", "", "", "", "", "", "";
};

&i2c3 {
	/* Resistive touch controller not populated on this one SoM variant. */
	touchscreen@49 {
		status = "disabled";
	};
};

&pcie_phy {
	status = "disabled";
};

&pcie {
	status = "disabled";
};

/* Console UART */
&pinctrl_uart1 {
	fsl,pins = <
		/* No pull-ups on DRC02, enable in-SoC pull-ups */
		MX8MP_IOMUXC_SAI2_RXC__UART1_DCE_RX		0x149
		MX8MP_IOMUXC_SAI2_RXFS__UART1_DCE_TX		0x149
	>;
};

&pinctrl_uart3 {
	fsl,pins = <
		/* No pull-ups on DRC02, enable in-SoC pull-ups */
		MX8MP_IOMUXC_ECSPI1_SCLK__UART3_DCE_RX		0x149
		MX8MP_IOMUXC_ECSPI1_MOSI__UART3_DCE_TX		0x149
	>;
};

&uart1 {
	/*
	 * Due to the use of CAN2 the signals for CAN2 Tx and Rx are routed to
	 * DHCOM UART1 RTS/CTS pins. Therefore this UART have to use DHCOM GPIOs
	 * for RTS/CTS. So configure DHCOM GPIO I as RTS and GPIO M as CTS.
	 */
	/delete-property/ uart-has-rtscts;
	cts-gpios = <&gpio5 5 GPIO_ACTIVE_HIGH>; /* GPIO M */
	pinctrl-0 = <&pinctrl_uart1 &pinctrl_dhcom_i &pinctrl_dhcom_m>;
	pinctrl-names = "default";
	rts-gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>; /* GPIO I */
};

&uart3 {
	/*
	 * On DRC02 this UART is used as RS485 interface and RS485_TX_En is
	 * controlled by DHCOM GPIO P. So remove RTS/CTS pins and the property
	 * uart-has-rtscts from this UART and add the DHCOM GPIO P pin via
	 * rts-gpios. The RS485_RX_En is controlled by DHCOM GPIO Q, see gpio1
	 * node above.
	 */
	/delete-property/ uart-has-rtscts;
	linux,rs485-enabled-at-boot-time;
	pinctrl-0 = <&pinctrl_uart3 &pinctrl_dhcom_p &pinctrl_dhcom_q>;
	pinctrl-names = "default";
	rts-gpios = <&gpio2 10 GPIO_ACTIVE_HIGH>; /* GPIO P */
};

/* No WiFi/BT chipset on this SoM variant. */
&uart2 {
	bluetooth {
		status = "disabled";
	};
};

/* USB_OTG port is not routed out on DRC02. */
&usb3_0 {
	status = "disabled";
};

&usb_dwc3_0 {
	status = "disabled";
};

/* USB_HOST port has USB Hub connected to it, PWR/OC pins are unused */
&usb3_1 {
	fsl,disable-port-power-control;
	fsl,permanently-attached;
};

&usb_dwc3_1 {
	dr_mode = "host";
	maximum-speed = "high-speed";
};

/* No WiFi/BT chipset on this SoM variant. */
&usdhc1 {
	status = "disabled";
};

&iomuxc {
	/*
	 * GPIO I is connected to UART1_RTS
	 * GPIO M is connected to UART1_CTS
	 * GPIO P is connected to RS485_TX_En
	 * GPIO Q is connected to RS485_RX_En
	 */
	pinctrl-0 = <&pinctrl_hog_base
		     &pinctrl_dhcom_a &pinctrl_dhcom_b &pinctrl_dhcom_c
		     &pinctrl_dhcom_d &pinctrl_dhcom_e &pinctrl_dhcom_f
		     &pinctrl_dhcom_g &pinctrl_dhcom_h &pinctrl_dhcom_j
		     &pinctrl_dhcom_k &pinctrl_dhcom_l &pinctrl_dhcom_n
		     &pinctrl_dhcom_o &pinctrl_dhcom_r &pinctrl_dhcom_s
		     &pinctrl_dhcom_int>;
};