1* Samsung's Keypad Controller device tree bindings 2 3Samsung's Keypad controller is used to interface a SoC with a matrix-type 4keypad device. The keypad controller supports multiple row and column lines. 5A key can be placed at each intersection of a unique row and a unique column. 6The keypad controller can sense a key-press and key-release and report the 7event using a interrupt to the cpu. 8 9Required SoC Specific Properties: 10- compatible: should be one of the following 11 - "samsung,s3c6410-keypad": For controllers compatible with s3c6410 keypad 12 controller. 13 - "samsung,s5pv210-keypad": For controllers compatible with s5pv210 keypad 14 controller. 15 16- reg: physical base address of the controller and length of memory mapped 17 region. 18 19- interrupts: The interrupt number to the cpu. 20 21Required Board Specific Properties: 22- samsung,keypad-num-rows: Number of row lines connected to the keypad 23 controller. 24 25- samsung,keypad-num-columns: Number of column lines connected to the 26 keypad controller. 27 28- Keys represented as child nodes: Each key connected to the keypad 29 controller is represented as a child node to the keypad controller 30 device node and should include the following properties. 31 - keypad,row: the row number to which the key is connected. 32 - keypad,column: the column number to which the key is connected. 33 - linux,code: the key-code to be reported when the key is pressed 34 and released. 35 36- pinctrl-0: Should specify pin control groups used for this controller. 37- pinctrl-names: Should contain only one value - "default". 38 39Optional Properties: 40- wakeup-source: use any event on keypad as wakeup event. 41 (Legacy property supported: "linux,input-wakeup") 42 43Optional Properties specific to linux: 44- linux,keypad-no-autorepeat: do no enable autorepeat feature. 45 46 47Example: 48 keypad@100a0000 { 49 compatible = "samsung,s5pv210-keypad"; 50 reg = <0x100A0000 0x100>; 51 interrupts = <173>; 52 samsung,keypad-num-rows = <2>; 53 samsung,keypad-num-columns = <8>; 54 linux,input-no-autorepeat; 55 wakeup-source; 56 57 pinctrl-names = "default"; 58 pinctrl-0 = <&keypad_rows &keypad_columns>; 59 60 key_1 { 61 keypad,row = <0>; 62 keypad,column = <3>; 63 linux,code = <2>; 64 }; 65 66 key_2 { 67 keypad,row = <0>; 68 keypad,column = <4>; 69 linux,code = <3>; 70 }; 71 72 key_3 { 73 keypad,row = <0>; 74 keypad,column = <5>; 75 linux,code = <4>; 76 }; 77 }; 78