linux-kernel - [PATCH 7/7] ARM: dts: bcm2835: Enable the Raspberry Pi touchscreen panel.

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Date:   Thu, 15 Jun 2017 13:41:30 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>
Subject: [PATCH 7/7] ARM: dts: bcm2835: Enable the Raspberry Pi touchscreen panel.

This commit is not intended to be merged.  Instead we will use
overlays to enable the panel, and this commit is just a demo of how
things get wired up.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 arch/arm/boot/dts/bcm2835-rpi-b-plus.dts         |  5 ++++
 arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts         |  5 ++++
 arch/arm/boot/dts/bcm2835-rpi-b.dts              |  5 ++++
 arch/arm/boot/dts/bcm2836-rpi-2-b.dts            |  5 ++++
 arch/arm/boot/dts/bcm283x.dtsi                   | 30 +++++++++++++++++++++++-
 arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts |  5 ++++
 6 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts b/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts
index 432088ebb0a1..79f433eacb8b 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-b-plus.dts
@@ -101,3 +101,8 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
 };
+
+&i2c_dsi {
+	gpios = <&gpio 28 0
+		 &gpio 29 0>;
+};
diff --git a/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts b/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts
index 4133bc2cd9be..145e0e4c2c7f 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-b-rev2.dts
@@ -94,3 +94,8 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
 };
+
+&i2c_dsi {
+	gpios = <&gpio 2 0
+		 &gpio 3 0>;
+};
diff --git a/arch/arm/boot/dts/bcm2835-rpi-b.dts b/arch/arm/boot/dts/bcm2835-rpi-b.dts
index 4d56fe3006b0..5b3f85883f0c 100644
--- a/arch/arm/boot/dts/bcm2835-rpi-b.dts
+++ b/arch/arm/boot/dts/bcm2835-rpi-b.dts
@@ -89,3 +89,8 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_HIGH>;
 };
+
+&i2c_dsi {
+	gpios = <&gpio 0 0
+		 &gpio 1 0>;
+};
diff --git a/arch/arm/boot/dts/bcm2836-rpi-2-b.dts b/arch/arm/boot/dts/bcm2836-rpi-2-b.dts
index bf19e8cfb9e6..aa63cc29eca8 100644
--- a/arch/arm/boot/dts/bcm2836-rpi-2-b.dts
+++ b/arch/arm/boot/dts/bcm2836-rpi-2-b.dts
@@ -39,3 +39,8 @@
 &hdmi {
 	hpd-gpios = <&gpio 46 GPIO_ACTIVE_LOW>;
 };
+
+&i2c_dsi {
+	gpios = <&gpio 28 0
+		 &gpio 29 0>;
+};
diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi
index 35cea3fcaf5c..682f11a4fc91 100644
--- a/arch/arm/boot/dts/bcm283x.dtsi
+++ b/arch/arm/boot/dts/bcm283x.dtsi
@@ -505,7 +505,11 @@
 					     "dsi1_ddr2",
 					     "dsi1_ddr";
 
-			status = "disabled";
+			port {
+				dsi_out_port: endpoint {
+					remote-endpoint = <&panel_dsi_port>;
+				};
+			};
 		};
 
 		i2c1: i2c@...04000 {
@@ -575,6 +579,30 @@
 		vc4: gpu {
 			compatible = "brcm,bcm2835-vc4";
 		};
+
+		i2c_dsi: i2c {
+			/* We have to use i2c-gpio because the
+			 * firmware is also polling another device
+			 * using the only hardware I2C bus that could
+			 * connect to these pins.
+			 */
+			compatible = "i2c-gpio";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			gpios = <&gpio 28 0
+				 &gpio 29 0>;
+
+			lcd@45 {
+				compatible = "raspberrypi,7inch-touchscreen-panel";
+				reg = <0x45>;
+
+				port {
+					panel_dsi_port: endpoint {
+						remote-endpoint = <&dsi_out_port>;
+					};
+				};
+			};
+		};
 	};
 
 	clocks {
diff --git a/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts b/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts
index c309633a1e87..c11026c6c8b4 100644
--- a/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts
+++ b/arch/arm64/boot/dts/broadcom/bcm2837-rpi-3-b.dts
@@ -22,3 +22,8 @@
 &uart1 {
 	status = "okay";
 };
+
+&i2c_dsi {
+	gpios = <&gpio 44 0
+		 &gpio 45 0>;
+};
-- 
2.11.0