Add bindings for the SoC information register of the Amlogic SoCs.

Signed-off-by: Neil Armstrong <narmstrong-rdvid1DuHRBWk0Htik3J/w@public.gmane.org>
---
 Documentation/devicetree/bindings/arm/amlogic.txt | 32 +++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/amlogic.txt b/Documentation/devicetree/bindings/arm/amlogic.txt
index 5c01e65..ae3e8ed 100644
--- a/Documentation/devicetree/bindings/arm/amlogic.txt
+++ b/Documentation/devicetree/bindings/arm/amlogic.txt

@@ -60,3 +60,35 @@ Board compatible values (alphabetically, grouped by SoC):
   - "amlogic,q201" (Meson gxm s912)
   - "kingnovel,r-box-pro" (Meson gxm S912)
   - "nexbox,a1" (Meson gxm s912)
+
+Amlogic Meson Firmware registers Interface
+------------------------------------------
+
+The Meson SoCs have a register bank with status and data shared with the
+secure firmware.
+
+Required properties:
+ - compatible: For Meson GX SoCs, must be "amlogic,meson-gx-ao-secure", "syscon", "simple-mfd"
+
+Sub-nodes should indentify components of this register interface :
+
+Meson GX SoC Information
+------------------------
+A firmware register encodes the SoC type, package and revision information on
+the Meson GX SoCs.
+If present, a device node for this register should be added.
+
+Required properties:
+  - compatible: For Meson GX SoCs, must be "amlogic,meson-gx-chipid".
+
+Example
+-------
+
+ao-secure@140 {
+	compatible = "amlogic,meson-gx-ao-secure", "syscon", "simple-mfd";
+	reg = <0x0 0x140 0x0 0x140>;
+
+	chipid {
+		compatible = "amlogic,meson-gx-chipid";