1Device tree bindings for Microchip CAP11xx based capacitive touch sensors 2 3The node for this device must be a child of a I2C controller node, as the 4device communication via I2C only. 5 6Required properties: 7 8 compatible: Must contain one of: 9 "microchip,cap1106" 10 "microchip,cap1126" 11 "microchip,cap1188" 12 13 reg: The I2C slave address of the device. 14 15 interrupts: Property describing the interrupt line the 16 device's ALERT#/CM_IRQ# pin is connected to. 17 The device only has one interrupt source. 18 19Optional properties: 20 21 autorepeat: Enables the Linux input system's autorepeat 22 feature on the input device. 23 24 microchip,sensor-gain: Defines the gain of the sensor circuitry. This 25 effectively controls the sensitivity, as a 26 smaller delta capacitance is required to 27 generate the same delta count values. 28 Valid values are 1, 2, 4, and 8. 29 By default, a gain of 1 is set. 30 31 microchip,irq-active-high: By default the interrupt pin is active low 32 open drain. This property allows using the active 33 high push-pull output. 34 35 linux,keycodes: Specifies an array of numeric keycode values to 36 be used for the channels. If this property is 37 omitted, KEY_A, KEY_B, etc are used as 38 defaults. The array must have exactly six 39 entries. 40 41Example: 42 43i2c_controller { 44 cap1106@28 { 45 compatible = "microchip,cap1106"; 46 interrupt-parent = <&gpio1>; 47 interrupts = <0 0>; 48 reg = <0x28>; 49 autorepeat; 50 microchip,sensor-gain = <2>; 51 52 linux,keycodes = <103>, /* KEY_UP */ 53 <106>, /* KEY_RIGHT */ 54 <108>, /* KEY_DOWN */ 55 <105>, /* KEY_LEFT */ 56 <109>, /* KEY_PAGEDOWN */ 57 <104>; /* KEY_PAGEUP */ 58 59 #address-cells = <1>; 60 #size-cells = <0>; 61 62 usr@0 { 63 label = "cap11xx:green:usr0"; 64 reg = <0>; 65 }; 66 67 usr@1 { 68 label = "cap11xx:green:usr1"; 69 reg = <1>; 70 }; 71 72 alive@2 { 73 label = "cap11xx:green:alive"; 74 reg = <2>; 75 linux,default_trigger = "heartbeat"; 76 }; 77 }; 78} 79