device-tree: nexus7: Add IMEM syscon and reboot reason support

This patch add the IMEM syscon memory region to the DT,
as well as addds support for the magic reboot reason
values that are written to the address for each mode.

Cc: Rob Herring <[email protected]>
Cc: Andy Gross <[email protected]>
Cc: Bjorn Andersson <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: John Stultz <[email protected]>
Reviewed-by: Bjorn Andersson <[email protected]>
Signed-off-by: Andy Gross <[email protected]>

arch/arm/boot/dts/qcom-apq8064-asus-nexus7-flo.dts

@@ -273,5 +273,19 @@
 				vqmmc-supply = <&pm8921_s4>;
 			};
 		};
+
+		imem@2a03f000 {
+			compatible = "syscon", "simple-mfd";
+			reg = <0x2a03f000 0x1000>;
+
+			reboot-mode {
+				compatible = "syscon-reboot-mode";
+				offset = <0x65c>;
+
+				mode-normal	= <0x77665501>;
+				mode-bootloader	= <0x77665500>;
+				mode-recovery	= <0x77665502>;
+			};
+		};
 	};
 };