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+A simple common binding for matrix-connected key boards. Currently targeted at
+defining the keys in the scope of linux key codes since that is a stable and
+standardized interface at this time.
+Required properties:
+- linux,keymap: an array of packed 1-cell entries containing the equivalent
+ of row, column and linux key-code. The 32-bit big endian cell is packed
+ as:
+ row << 24 | column << 16 | key-code
+Optional properties:
+Properties for the number of rows and columns are optional because some
+drivers will use fixed values for these.
+- keypad,num-rows: Number of row lines connected to the keypad controller.
+- keypad,num-columns: Number of column lines connected to the keypad
+ controller.
+Some users of this binding might choose to specify secondary keymaps for
+cases where there is a modifier key such as a Fn key. Proposed names
+for said properties are "linux,fn-keymap" or with another descriptive
+word for the modifier other from "Fn".
+ linux,keymap = < 0x00030012
+ 0x0102003a >;
+ keypad,num-rows = <2>;
+ keypad,num-columns = <8>;