ARM: dts: omap4+: Add DMM bindings

Add Dynamic Memory Manager (DMM) bindings for OMAP4 and OMAP5 and DRA7x devices.
DMM only requires address and irq information.

Add documentation for the DMM bindings.

Originally worked on by Andy Gross <andygro@gmail.com>

Cc: Andy Gross <andygro@gmail.com>
Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Benoit Cousson <bcousson@baylibre.com>
diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
index 1fd75aa..6e89630 100644
--- a/arch/arm/boot/dts/dra7.dtsi
+++ b/arch/arm/boot/dts/dra7.dtsi
@@ -464,6 +464,13 @@
 			ti,hwmods = "wd_timer2";
 		};
 
+		dmm@4e000000 {
+			compatible = "ti,omap5-dmm";
+			reg = <0x4e000000 0x800>;
+			interrupts = <0 113 0x4>;
+			ti,hwmods = "dmm";
+		};
+
 		i2c1: i2c@48070000 {
 			compatible = "ti,omap4-i2c";
 			reg = <0x48070000 0x100>;