217 lines
6.2 KiB
Diff
217 lines
6.2 KiB
Diff
From 5752746d0694ee607c2971735f2befc8a86fbab9 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 15 Apr 2021 16:46:34 +0100
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Subject: [PATCH] dtoverlays: Add overlays for JDI LT070ME05000
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1200x1920 DSI panel
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Credit to forum member gizmomouse on
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https://www.raspberrypi.org/forums/viewtopic.php?f=98&t=253912 and
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Andrey Vostrukhin of Harlab for these overlays.
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See https://github.com/harlab/CM4_LCD_LT070ME05000 for
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schematics and docs for the adapter board to connect this panel which
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is found in the Asus/Google 2013 Nexus 7" tablet and therefore
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relatively easily available.
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Note that this uses 4 DSI data lanes, and therefore MUST be used
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with DISP1 on a Compute Module. It can not be used on a standard
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Pi.
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There are two versions of the adapter board. V1 connects the
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display controls to Pi GPIOs, whilst v2 uses an I2C GPIO expander
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so needs no additional connections beyond the FFC and power.
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The touchscreen overlay for these panels varies, so that part
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is not configured.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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arch/arm/boot/dts/overlays/Makefile | 2 +
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arch/arm/boot/dts/overlays/README | 21 ++++++
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.../vc4-kms-dsi-lt070me05000-overlay.dts | 69 +++++++++++++++++++
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.../vc4-kms-dsi-lt070me05000-v2-overlay.dts | 64 +++++++++++++++++
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4 files changed, 156 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/vc4-kms-dsi-lt070me05000-overlay.dts
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create mode 100644 arch/arm/boot/dts/overlays/vc4-kms-dsi-lt070me05000-v2-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -213,6 +213,8 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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upstream-pi4.dtbo \
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vc4-fkms-v3d.dtbo \
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vc4-kms-dsi-7inch.dtbo \
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+ vc4-kms-dsi-lt070me05000.dtbo \
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+ vc4-kms-dsi-lt070me05000-v2.dtbo \
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vc4-kms-kippah-7inch.dtbo \
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vc4-kms-v3d.dtbo \
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vc4-kms-v3d-pi4.dtbo \
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -3158,6 +3158,27 @@ Load: dtoverlay=vc4-kms-dsi-7inch
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Params: <None>
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+Name: vc4-kms-dsi-lt070me05000
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+Info: Enable a JDI LT070ME05000 DSI display on DSI1.
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+ Note that this is a 4 lane DSI device, so it will only work on a Compute
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+ Module.
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+ Requires vc4-kms-v3d to be loaded.
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+Load: dtoverlay=vc4-kms-dsi-lt070me05000,<param>
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+Params: reset GPIO for the reset signal (default 17)
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+ enable GPIO for the enable signal (default 4)
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+ dcdc-en GPIO for the DC-DC converter enable (default 5)
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+
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+
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+Name: vc4-kms-dsi-lt070me05000-v2
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+Info: Enable a JDI LT070ME05000 DSI display on DSI1 using Harlab's V2
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+ interface board.
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+ Note that this is a 4 lane DSI device, so it will only work on a Compute
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+ Module.
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+ Requires vc4-kms-v3d to be loaded.
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+Load: dtoverlay=vc4-kms-dsi-lt070me05000-v2
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+Params: <None>
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+
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+
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Name: vc4-kms-kippah-7inch
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Info: Enable the Adafruit DPI Kippah with the 7" Ontat panel attached.
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Requires vc4-kms-v3d to be loaded.
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/vc4-kms-dsi-lt070me05000-overlay.dts
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@@ -0,0 +1,69 @@
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+/*
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+ * Device Tree overlay to connect a JDI LT070ME05000 DSI panel to DSI1.
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+ * This uses 4 DSI data lanes, so can only be used with a Compute Module.
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+ *
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+ * Credit to forum user gizmomouse on
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+ * https://www.raspberrypi.org/forums/viewtopic.php?f=98&t=253912 and
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+ * Andrey Vostrukhin of Harlab for the overlay.
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+ *
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+ * Refer to https://github.com/harlab/CM4_LCD_LT070ME05000 for schematics and
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+ * other documentation.
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+ */
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+
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target = <&dsi1>;
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+ __overlay__{
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ port {
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+ dsi_out_port:endpoint {
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+ remote-endpoint = <&panel_dsi_port>;
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+ };
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+ };
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+
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+ lt070me05000:lt070me05000@0 {
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+ compatible = "jdi,lt070me05000";
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+ status = "okay";
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+ reg = <0>;
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+ reset-gpios = <&gpio 17 1>; // LCD RST
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+ enable-gpios = <&gpio 4 0>; // LCD Enable
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+ dcdc-en-gpios = <&gpio 5 0>; // LCD DC-DC Enable
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+ port {
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+ panel_dsi_port: endpoint {
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+ remote-endpoint = <&dsi_out_port>;
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+ };
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+ };
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ lt070me05000_pins: lt070me05000_pins {
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+ brcm,pins = <4 5 17>;
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+ brcm,function = <1 1 1>; // out
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+ brcm,pull = <0 0 0>; // off
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+ };
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+ };
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+
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+ };
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+
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+ __overrides__ {
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+ reset = <<070me05000_pins>,"brcm,pins:8",
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+ <<070me05000>,"reset-gpios:4";
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+
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+ enable = <<070me05000_pins>,"brcm,pins:0",
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+ <<070me05000>,"enable-gpios:4";
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+
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+ dcdc-en = <<070me05000_pins>,"brcm,pins:4",
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+ <<070me05000>,"dcdc-en-gpios:4";
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+ };
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+};
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/vc4-kms-dsi-lt070me05000-v2-overlay.dts
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@@ -0,0 +1,64 @@
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+/*
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+ * Device Tree overlay to connect a JDI LT070ME05000 DSI panel to DSI1.
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+ * This uses 4 DSI data lanes, so can only be used with a Compute Module.
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+ *
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+ * The overlay is for V2 of Harlab's interface board that uses a PCA9536 to
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+ * handle the panel's control GPIOs instead of wiring it back to Pi GPIOs.
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+ *
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+ * Credit to Andrey Vostrukhin of Harlab for the overlay.
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+ *
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+ * Refer to https://github.com/harlab/CM4_LCD_LT070ME05000 for schematics and
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+ * other documentation.
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+ */
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+
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2835";
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+
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+ fragment@0 {
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+ target = <&i2c_csi_dsi>;
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+ __overlay__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ status = "okay";
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+
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+ pca: pca@41 {
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+ compatible = "nxp,pca9536";
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+ reg = <0x41>;
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+ gpio-controller;
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+ #gpio-cells = <2>;
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+ status = "okay";
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&dsi1>;
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+ __overlay__{
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+ status = "okay";
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ port {
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+ dsi_out_port:endpoint {
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+ remote-endpoint = <&panel_dsi_port>;
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+ };
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+ };
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+
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+ lt070me05000:lt070me05000@0 {
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+ compatible = "jdi,lt070me05000";
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+ status = "okay";
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+ reg = <0>;
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+ reset-gpios = <&pca 0 1>;
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+ enable-gpios = <&pca 2 0>;
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+ dcdc-en-gpios = <&pca 1 0>;
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+ port {
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+ panel_dsi_port: endpoint {
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+ remote-endpoint = <&dsi_out_port>;
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+ };
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+ };
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+ };
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+ };
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+ };
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+};
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