overlays/toradex-smarc-imx8mp_dsi-to-hdmi_overlay.dts


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109

// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
/*
 * Copyright (C) 2025 Toradex
 *
 * LT8912B MIPI DSI to HDMI accessory
 *
 * https://developer.toradex.com/hardware/accessories/add-ons/dsi-hdmi-adapter
 * https://www.toradex.com/accessories/verdin-dsi-to-hdmi-adapter
 */

/dts-v1/;
/plugin/;

#include <dt-bindings/gpio/gpio.h>
#include "imx8mp-pinfunc.h"

/ {
	compatible = "toradex,smarc-imx8mp";
};

&{/} {
	dsi-hdmi-connector {
		compatible = "hdmi-connector";
		pinctrl-names = "default";
		pinctrl-0 = <&pinctrl_hdmi_hpd>;
		/* I2C on DSI Connector Pins 52/54 */
		ddc-i2c-bus = <&i2c_dsi_1>;
		/* SMARC LCD1_BKLT_PWM as GPIO */
		hpd-gpios = <&gpio5 5 GPIO_ACTIVE_HIGH>;
		label = "DSI-HDMI";
		type = "a";

		port {
			hdmi_connector_in: endpoint {
				remote-endpoint = <&lt8912_hdmi_out>;
			};
		};
	};
};

/* I2C on DSI Connector Pins 4/6 */
&i2c_dsi_0 {
	#address-cells = <1>;
	#size-cells = <0>;

	bridge@48 {
		compatible = "lontium,lt8912b";
		reg = <0x48>;
		/* SMARC LCD1_BKLT_EN */
		reset-gpios = <&som_gpio_expander 7 GPIO_ACTIVE_LOW>;

		ports {
			#address-cells = <1>;
			#size-cells = <0>;

			port@0 {
				reg = <0>;

				lt8912_dsi_in: endpoint {
					data-lanes = <1 2 3 4>;
					remote-endpoint = <&mipi_dsi_bridge1_out>;
				};
			};

			port@1 {
				reg = <1>;

				lt8912_hdmi_out: endpoint {
					remote-endpoint = <&hdmi_connector_in>;
				};
			};
		};
	};
};

&lcdif1 {
	status = "okay";
};

&mipi_dsi {
	samsung,esc-clock-frequency = <16000000>;
	status = "okay";

	ports {
		#address-cells = <1>;
		#size-cells = <0>;

		port@1 {
			reg = <1>;

			mipi_dsi_bridge1_out: endpoint {
				attach-bridge;
				remote-endpoint = <&lt8912_dsi_in>;
			};
		};
	};
};

/* SMARC LCD1_BKLT_PWM - Used as GPIO */
&pwm1 {
	status = "disabled";
};

&iomuxc {
	/* SMARC LCD1_BKLT_PWM as GPIO */
	pinctrl_hdmi_hpd: hdmihpdgpiogrp {
		fsl,pins = <MX8MP_IOMUXC_SPDIF_EXT_CLK__GPIO5_IO05	0x104>; /* SMARC S122 - LCD1_BKLT_PWM */
	};
};