[PATCH 4/4] ARM: dts: bcm2837-rpi-3-b: add GPIO expander

[Baruch Siach]

Add a description of the RPi3 GPIO expander that the VC4 firmware controls.

Signed-off-by: Baruch Siach <baruch at tkos.co.il>
---
 arch/arm/boot/dts/bcm2837-rpi-3-b.dts | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/bcm2837-rpi-3-b.dts b/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
index b44b3b5af00d..09dca48da2bd 100644
--- a/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
+++ b/arch/arm/boot/dts/bcm2837-rpi-3-b.dts
@@ -23,6 +23,16 @@
 			gpios = <&gpio 47 0>;
 		};
 	};
+
+	soc {
+		expgpio: expgpio {
+			compatible = "brcm,bcm2835-expgpio";
+			gpio-controller;
+			#gpio-cells = <2>;
+			firmware = <&firmware>;
+			status = "okay";
+		};
+	};
 };
 
 /* uart0 communicates with the BT module */
-- 
2.15.1