linux-kernel - [PATCH 11/11] ARM: bcm2835: Enable the Raspberry Pi touchscreen panel.

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Date:   Wed, 14 Dec 2016 11:46:21 -0800
From:   Eric Anholt <eric@...olt.net>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        dri-devel@...ts.freedesktop.org,
        Thierry Reding <thierry.reding@...il.com>
Cc:     linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stephen Warren <swarren@...dotorg.org>,
        Lee Jones <lee@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com, linux-clk@...r.kernel.org,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH 11/11] ARM: 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/bcm283x.dtsi | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/arch/arm/boot/dts/bcm283x.dtsi b/arch/arm/boot/dts/bcm283x.dtsi
index 82a4eccfb3d8..e96d0f29759a 100644
--- a/arch/arm/boot/dts/bcm283x.dtsi
+++ b/arch/arm/boot/dts/bcm283x.dtsi
@@ -286,7 +286,12 @@
 					     "dsi1_ddr2",
 					     "dsi1_ddr";
 
-			status = "disabled";
+			pitouchscreen: panel@0 {
+				compatible = "raspberrypi,touchscreen";
+				reg = <0>;
+
+				raspberrypi,touchscreen-bridge = <&pitouchscreen_bridge>;
+			};
 		};
 
 		i2c1: i2c@...04000 {
@@ -346,6 +351,29 @@
 		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>;
+
+			pitouchscreen_bridge: bridge@45 {
+				compatible = "raspberrypi,touchscreen-bridge-i2c";
+				reg = <0x45>;
+			};
+
+			pitouchscreen_touch: bridge@38 {
+				compatible = "raspberrypi,touchscreen-ts-i2c";
+				reg = <0x38>;
+			};
+		};
 	};
 
 	clocks {
-- 
2.11.0