1*c66ec88fSEmmanuel Vadot* GPIO driven matrix keypad device tree bindings 2*c66ec88fSEmmanuel Vadot 3*c66ec88fSEmmanuel VadotGPIO driven matrix keypad is used to interface a SoC with a matrix keypad. 4*c66ec88fSEmmanuel VadotThe matrix keypad supports multiple row and column lines, a key can be 5*c66ec88fSEmmanuel Vadotplaced at each intersection of a unique row and a unique column. The matrix 6*c66ec88fSEmmanuel Vadotkeypad can sense a key-press and key-release by means of GPIO lines and 7*c66ec88fSEmmanuel Vadotreport the event using GPIO interrupts to the cpu. 8*c66ec88fSEmmanuel Vadot 9*c66ec88fSEmmanuel VadotRequired Properties: 10*c66ec88fSEmmanuel Vadot- compatible: Should be "gpio-matrix-keypad" 11*c66ec88fSEmmanuel Vadot- row-gpios: List of gpios used as row lines. The gpio specifier 12*c66ec88fSEmmanuel Vadot for this property depends on the gpio controller to 13*c66ec88fSEmmanuel Vadot which these row lines are connected. 14*c66ec88fSEmmanuel Vadot- col-gpios: List of gpios used as column lines. The gpio specifier 15*c66ec88fSEmmanuel Vadot for this property depends on the gpio controller to 16*c66ec88fSEmmanuel Vadot which these column lines are connected. 17*c66ec88fSEmmanuel Vadot- linux,keymap: The definition can be found at 18*c66ec88fSEmmanuel Vadot bindings/input/matrix-keymap.txt 19*c66ec88fSEmmanuel Vadot 20*c66ec88fSEmmanuel VadotOptional Properties: 21*c66ec88fSEmmanuel Vadot- linux,no-autorepeat: do no enable autorepeat feature. 22*c66ec88fSEmmanuel Vadot- wakeup-source: use any event on keypad as wakeup event. 23*c66ec88fSEmmanuel Vadot (Legacy property supported: "linux,wakeup") 24*c66ec88fSEmmanuel Vadot- debounce-delay-ms: debounce interval in milliseconds 25*c66ec88fSEmmanuel Vadot- col-scan-delay-us: delay, measured in microseconds, that is needed 26*c66ec88fSEmmanuel Vadot before we can scan keypad after activating column gpio 27*c66ec88fSEmmanuel Vadot- drive-inactive-cols: drive inactive columns during scan, 28*c66ec88fSEmmanuel Vadot default is to turn inactive columns into inputs. 29*c66ec88fSEmmanuel Vadot 30*c66ec88fSEmmanuel VadotExample: 31*c66ec88fSEmmanuel Vadot matrix-keypad { 32*c66ec88fSEmmanuel Vadot compatible = "gpio-matrix-keypad"; 33*c66ec88fSEmmanuel Vadot debounce-delay-ms = <5>; 34*c66ec88fSEmmanuel Vadot col-scan-delay-us = <2>; 35*c66ec88fSEmmanuel Vadot 36*c66ec88fSEmmanuel Vadot row-gpios = <&gpio2 25 0 37*c66ec88fSEmmanuel Vadot &gpio2 26 0 38*c66ec88fSEmmanuel Vadot &gpio2 27 0>; 39*c66ec88fSEmmanuel Vadot 40*c66ec88fSEmmanuel Vadot col-gpios = <&gpio2 21 0 41*c66ec88fSEmmanuel Vadot &gpio2 22 0>; 42*c66ec88fSEmmanuel Vadot 43*c66ec88fSEmmanuel Vadot linux,keymap = <0x0000008B 44*c66ec88fSEmmanuel Vadot 0x0100009E 45*c66ec88fSEmmanuel Vadot 0x02000069 46*c66ec88fSEmmanuel Vadot 0x0001006A 47*c66ec88fSEmmanuel Vadot 0x0101001C 48*c66ec88fSEmmanuel Vadot 0x0201006C>; 49*c66ec88fSEmmanuel Vadot }; 50