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 };
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