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
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
From 5752746d0694ee607c2971735f2befc8a86fbab9 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 15 Apr 2021 16:46:34 +0100
Subject: [PATCH] dtoverlays: Add overlays for JDI LT070ME05000
1200x1920 DSI panel
Credit to forum member gizmomouse on
https://www.raspberrypi.org/forums/viewtopic.php?f=98&t=253912 and
Andrey Vostrukhin of Harlab for these overlays.
See https://github.com/harlab/CM4_LCD_LT070ME05000 for
schematics and docs for the adapter board to connect this panel which
is found in the Asus/Google 2013 Nexus 7" tablet and therefore
relatively easily available.
Note that this uses 4 DSI data lanes, and therefore MUST be used
with DISP1 on a Compute Module. It can not be used on a standard
Pi.
There are two versions of the adapter board. V1 connects the
display controls to Pi GPIOs, whilst v2 uses an I2C GPIO expander
so needs no additional connections beyond the FFC and power.
The touchscreen overlay for these panels varies, so that part
is not configured.
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
arch/arm/boot/dts/overlays/Makefile | 2 +
arch/arm/boot/dts/overlays/README | 21 ++++++
.../vc4-kms-dsi-lt070me05000-overlay.dts | 69 +++++++++++++++++++
.../vc4-kms-dsi-lt070me05000-v2-overlay.dts | 64 +++++++++++++++++
4 files changed, 156 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/vc4-kms-dsi-lt070me05000-overlay.dts
create mode 100644 arch/arm/boot/dts/overlays/vc4-kms-dsi-lt070me05000-v2-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -213,6 +213,8 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
upstream-pi4.dtbo \
vc4-fkms-v3d.dtbo \
vc4-kms-dsi-7inch.dtbo \
+ vc4-kms-dsi-lt070me05000.dtbo \
+ vc4-kms-dsi-lt070me05000-v2.dtbo \
vc4-kms-kippah-7inch.dtbo \
vc4-kms-v3d.dtbo \
vc4-kms-v3d-pi4.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -3158,6 +3158,27 @@ Load: dtoverlay=vc4-kms-dsi-7inch
Params: <None>
+Name: vc4-kms-dsi-lt070me05000
+Info: Enable a JDI LT070ME05000 DSI display on DSI1.
+ Note that this is a 4 lane DSI device, so it will only work on a Compute
+ Module.
+ Requires vc4-kms-v3d to be loaded.
+Load: dtoverlay=vc4-kms-dsi-lt070me05000,<param>
+Params: reset GPIO for the reset signal (default 17)
+ enable GPIO for the enable signal (default 4)
+ dcdc-en GPIO for the DC-DC converter enable (default 5)
+
+
+Name: vc4-kms-dsi-lt070me05000-v2
+Info: Enable a JDI LT070ME05000 DSI display on DSI1 using Harlab's V2
+ interface board.
+ Note that this is a 4 lane DSI device, so it will only work on a Compute
+ Module.
+ Requires vc4-kms-v3d to be loaded.
+Load: dtoverlay=vc4-kms-dsi-lt070me05000-v2
+Params: <None>
+
+
Name: vc4-kms-kippah-7inch
Info: Enable the Adafruit DPI Kippah with the 7" Ontat panel attached.
Requires vc4-kms-v3d to be loaded.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/vc4-kms-dsi-lt070me05000-overlay.dts
@@ -0,0 +1,69 @@
+/*
+ * Device Tree overlay to connect a JDI LT070ME05000 DSI panel to DSI1.
+ * This uses 4 DSI data lanes, so can only be used with a Compute Module.
+ *
+ * Credit to forum user gizmomouse on
+ * https://www.raspberrypi.org/forums/viewtopic.php?f=98&t=253912 and
+ * Andrey Vostrukhin of Harlab for the overlay.
+ *
+ * Refer to https://github.com/harlab/CM4_LCD_LT070ME05000 for schematics and
+ * other documentation.
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&dsi1>;
+ __overlay__{
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ port {
+ dsi_out_port:endpoint {
+ remote-endpoint = <&panel_dsi_port>;
+ };
+ };
+
+ lt070me05000:lt070me05000@0 {
+ compatible = "jdi,lt070me05000";
+ status = "okay";
+ reg = <0>;
+ reset-gpios = <&gpio 17 1>; // LCD RST
+ enable-gpios = <&gpio 4 0>; // LCD Enable
+ dcdc-en-gpios = <&gpio 5 0>; // LCD DC-DC Enable
+ port {
+ panel_dsi_port: endpoint {
+ remote-endpoint = <&dsi_out_port>;
+ };
+ };
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ lt070me05000_pins: lt070me05000_pins {
+ brcm,pins = <4 5 17>;
+ brcm,function = <1 1 1>; // out
+ brcm,pull = <0 0 0>; // off
+ };
+ };
+
+ };
+
+ __overrides__ {
+ reset = <<070me05000_pins>,"brcm,pins:8",
+ <<070me05000>,"reset-gpios:4";
+
+ enable = <<070me05000_pins>,"brcm,pins:0",
+ <<070me05000>,"enable-gpios:4";
+
+ dcdc-en = <<070me05000_pins>,"brcm,pins:4",
+ <<070me05000>,"dcdc-en-gpios:4";
+ };
+};
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/vc4-kms-dsi-lt070me05000-v2-overlay.dts
@@ -0,0 +1,64 @@
+/*
+ * Device Tree overlay to connect a JDI LT070ME05000 DSI panel to DSI1.
+ * This uses 4 DSI data lanes, so can only be used with a Compute Module.
+ *
+ * The overlay is for V2 of Harlab's interface board that uses a PCA9536 to
+ * handle the panel's control GPIOs instead of wiring it back to Pi GPIOs.
+ *
+ * Credit to Andrey Vostrukhin of Harlab for the overlay.
+ *
+ * Refer to https://github.com/harlab/CM4_LCD_LT070ME05000 for schematics and
+ * other documentation.
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&i2c_csi_dsi>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "okay";
+
+ pca: pca@41 {
+ compatible = "nxp,pca9536";
+ reg = <0x41>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ status = "okay";
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&dsi1>;
+ __overlay__{
+ status = "okay";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ port {
+ dsi_out_port:endpoint {
+ remote-endpoint = <&panel_dsi_port>;
+ };
+ };
+
+ lt070me05000:lt070me05000@0 {
+ compatible = "jdi,lt070me05000";
+ status = "okay";
+ reg = <0>;
+ reset-gpios = <&pca 0 1>;
+ enable-gpios = <&pca 2 0>;
+ dcdc-en-gpios = <&pca 1 0>;
+ port {
+ panel_dsi_port: endpoint {
+ remote-endpoint = <&dsi_out_port>;
+ };
+ };
+ };
+ };
+ };
+};
|
