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+Holtek ht16k33 RAM mapping 16*8 LED controller driver with keyscan
+-------------------------------------------------------------------------------
+
+Required properties:
+- compatible: "holtek,ht16k33"
+- reg: I2C slave address of the chip.
+- interrupt-parent: A phandle pointing to the interrupt controller
+ serving the interrupt for this chip.
+- interrupts: Interrupt specification for the key pressed interrupt.
+- refresh-rate-hz: Display update interval in HZ.
+- debounce-delay-ms: Debouncing interval time in milliseconds.
+- linux,keymap: The keymap for keys as described in the binding
+ document (devicetree/bindings/input/matrix-keymap.txt).
+
+Optional properties:
+- linux,no-autorepeat: Disable keyrepeat.
+- default-brightness-level: Initial brightness level [0-15] (default: 15).
+
+Example:
+
+&i2c1 {
+ ht16k33: ht16k33@70 {
+ compatible = "holtek,ht16k33";
+ reg = <0x70>;
+ refresh-rate-hz = <20>;
+ debounce-delay-ms = <50>;
+ interrupt-parent = <&gpio4>;
+ interrupts = <5 (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_EDGE_RISING)>;
+ linux,keymap = <
+ MATRIX_KEY(2, 0, KEY_F6)
+ MATRIX_KEY(3, 0, KEY_F8)
+ MATRIX_KEY(4, 0, KEY_F10)
+ MATRIX_KEY(5, 0, KEY_F4)
+ MATRIX_KEY(6, 0, KEY_F2)
+ MATRIX_KEY(2, 1, KEY_F5)
+ MATRIX_KEY(3, 1, KEY_F7)
+ MATRIX_KEY(4, 1, KEY_F9)
+ MATRIX_KEY(5, 1, KEY_F3)
+ MATRIX_KEY(6, 1, KEY_F1)
+ >;
+ };
+};