1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Copyright (C) 2021 DH electronics GmbH
  4 */
  5
  6/ {
  7	chosen {
  8		stdout-path = "serial0:115200n8";
  9	};
 10};
 11
 12/*
 13 * Special SoM hardware required which uses the pins from micro SD card. The
 14 * pins SD3_DAT0 and SD3_DAT1 are muxed as can2 Tx and Rx. The signals for can2
 15 * Tx and Rx are routed to the DHCOM UART1 rts/cts pins. Therefore the micro SD
 16 * card must be disabled and the uart1 rts/cts must be output on other DHCOM
 17 * pins, see uart1 and usdhc3 node below.
 18 */
 19&can2 {
 20	status = "okay";
 21};
 22
 23&gpio1 {
 24	/*
 25	 * NOTE: On DRC02, the RS485_RX_En is controlled by a separate
 26	 * GPIO line, however the i.MX6 UART driver assumes RX happens
 27	 * during TX anyway and that it only controls drive enable DE
 28	 * line. Hence, the RX is always enabled here.
 29	 */
 30	rs485-rx-en-hog {
 31		gpio-hog;
 32		gpios = <18 0>; /* GPIO Q */
 33		line-name = "rs485-rx-en";
 34		output-low;
 35	};
 36};
 37
 38&gpio3 {
 39	gpio-line-names =
 40		"", "", "", "", "", "", "", "",
 41		"", "", "", "", "", "", "", "",
 42		"", "", "", "", "", "", "", "",
 43		"", "", "", "DRC02-In1", "", "", "", "";
 44};
 45
 46&gpio4 {
 47	gpio-line-names =
 48		"", "", "", "", "", "DHCOM-E", "DRC02-In2", "DHCOM-H",
 49		"DHCOM-I", "DRC02-HW0", "", "", "", "", "", "",
 50		"", "", "", "", "DRC02-Out1", "", "", "",
 51		"", "", "", "", "", "", "", "";
 52};
 53
 54&gpio6 {
 55	gpio-line-names =
 56		"", "", "", "DRC02-Out2", "", "", "SOM-HW1", "",
 57		"", "", "", "", "", "", "DRC02-HW2", "DRC02-HW1",
 58		"", "", "", "", "", "", "", "",
 59		"", "", "", "", "", "", "", "";
 60};
 61
 62&i2c1 {
 63	eeprom@50 {
 64		compatible = "atmel,24c04";
 65		reg = <0x50>;
 66		pagesize = <16>;
 67	};
 68};
 69
 70&uart1 {
 71	/*
 72	 * Due to the use of can2 the signals for can2 Tx and Rx are routed to
 73	 * DHCOM UART1 rts/cts pins. Therefore this UART have to use DHCOM GPIOs
 74	 * for rts/cts. So configure DHCOM GPIO I as rts and GPIO M as cts.
 75	 */
 76	/delete-property/ uart-has-rtscts;
 77	cts-gpios = <&gpio7 0 GPIO_ACTIVE_HIGH>; /* GPIO M */
 78	pinctrl-0 = <&pinctrl_uart1 &pinctrl_dhcom_i &pinctrl_dhcom_m>;
 79	pinctrl-names = "default";
 80	rts-gpios = <&gpio4 8 GPIO_ACTIVE_HIGH>; /* GPIO I */
 81};
 82
 83&uart5 {
 84	/*
 85	 * On DRC02 this UART is used as RS485 interface and RS485_TX_En is
 86	 * controlled by DHCOM GPIO P. So remove rts/cts pins and the property
 87	 * uart-has-rtscts from this UART and add the DHCOM GPIO P pin via
 88	 * rts-gpios. The RS485_RX_En is controlled by DHCOM GPIO Q, see gpio1
 89	 * node above.
 90	 */
 91	/delete-property/ uart-has-rtscts;
 92	linux,rs485-enabled-at-boot-time;
 93	pinctrl-0 = <&pinctrl_uart5_core &pinctrl_dhcom_p &pinctrl_dhcom_q>;
 94	pinctrl-names = "default";
 95	rts-gpios = <&gpio7 13 GPIO_ACTIVE_HIGH>; /* GPIO P */
 96};
 97
 98&usbh1 {
 99	disable-over-current;
100};
101
102&usdhc2 { /* SD card */
103	status = "okay";
104};
105
106&usdhc3 {
107	/*
108	 * Due to the use of can2 the micro SD card on module have to be
109	 * disabled, because the pins SD3_DAT0 and SD3_DAT1 are muxed as
110	 * can2 Tx and Rx.
111	 */
112	status = "disabled";
113};
114
115&iomuxc {
116	pinctrl-0 = <
117			/*
118			 * The following DHCOM GPIOs are used on this board.
119			 * Therefore, they have been removed from the list below.
120			 * I: uart1 rts
121			 * M: uart1 cts
122			 * P: uart5 rs485-tx-en
123			 * Q: uart5 rs485-rx-en
124			 */
125			&pinctrl_hog_base
126			&pinctrl_dhcom_a &pinctrl_dhcom_b &pinctrl_dhcom_c
127			&pinctrl_dhcom_d &pinctrl_dhcom_e &pinctrl_dhcom_f
128			&pinctrl_dhcom_g &pinctrl_dhcom_h
129			&pinctrl_dhcom_j &pinctrl_dhcom_k &pinctrl_dhcom_l
130			&pinctrl_dhcom_n &pinctrl_dhcom_o
131			&pinctrl_dhcom_r
132			&pinctrl_dhcom_s &pinctrl_dhcom_t &pinctrl_dhcom_u
133			&pinctrl_dhcom_v &pinctrl_dhcom_w &pinctrl_dhcom_int
134		>;
135	pinctrl-names = "default";
136
137	pinctrl_uart5_core: uart5-core-grp {
138		fsl,pins = <
139			MX6QDL_PAD_CSI0_DAT14__UART5_TX_DATA	0x1b0b1
140			MX6QDL_PAD_CSI0_DAT15__UART5_RX_DATA	0x1b0b1
141		>;
142	};
143};