DT: bindings: bcm: Add Raspberry Pi Zero

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

Documentation/devicetree/bindings/arm/bcm/brcm,bcm2835.txt

@@ -38,6 +38,10 @@ Raspberry Pi Compute Module
 Required root node properties:
 compatible = "raspberrypi,compute-module", "brcm,bcm2835";
 
+Raspberry Pi Zero
+Required root node properties:
+compatible = "raspberrypi,model-zero", "brcm,bcm2835";
+
 Generic BCM2835 board
 Required root node properties:
 compatible = "brcm,bcm2835";