1* Cypress cyttsp touchscreen controller 2 3Required properties: 4 - compatible : must be "cypress,cyttsp-i2c" or "cypress,cyttsp-spi" 5 - reg : Device I2C address or SPI chip select number 6 - spi-max-frequency : Maximum SPI clocking speed of the device (for cyttsp-spi) 7 - interrupts : (gpio) interrupt to which the chip is connected 8 (see interrupt binding[0]). 9 - bootloader-key : the 8-byte bootloader key that is required to switch 10 the chip from bootloader mode (default mode) to 11 application mode. 12 This property has to be specified as an array of 8 13 '/bits/ 8' values. 14 15Optional properties: 16 - reset-gpios : the reset gpio the chip is connected to 17 (see GPIO binding[1] for more details). 18 - touchscreen-size-x : horizontal resolution of touchscreen (in pixels) 19 - touchscreen-size-y : vertical resolution of touchscreen (in pixels) 20 - touchscreen-fuzz-x : horizontal noise value of the absolute input device 21 (in pixels) 22 - touchscreen-fuzz-y : vertical noise value of the absolute input device 23 (in pixels) 24 - active-distance : the distance in pixels beyond which a touch must move 25 before movement is detected and reported by the device. 26 Valid values: 0-15. 27 - active-interval-ms : the minimum period in ms between consecutive 28 scanning/processing cycles when the chip is in active mode. 29 Valid values: 0-255. 30 - lowpower-interval-ms : the minimum period in ms between consecutive 31 scanning/processing cycles when the chip is in low-power mode. 32 Valid values: 0-2550 33 - touch-timeout-ms : minimum time in ms spent in the active power state while no 34 touches are detected before entering low-power mode. 35 Valid values: 0-2550 36 - use-handshake : enable register-based handshake (boolean). This should 37 only be used if the chip is configured to use 'blocking 38 communication with timeout' (in this case the device 39 generates an interrupt at the end of every 40 scanning/processing cycle). 41 42[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt 43[1]: Documentation/devicetree/bindings/gpio/gpio.txt 44 45Example: 46 &i2c1 { 47 /* ... */ 48 cyttsp@a { 49 compatible = "cypress,cyttsp-i2c"; 50 reg = <0xa>; 51 interrupt-parent = <&gpio0>; 52 interrupts = <28 0>; 53 reset-gpios = <&gpio3 4 GPIO_ACTIVE_LOW>; 54 55 touchscreen-size-x = <800>; 56 touchscreen-size-y = <480>; 57 touchscreen-fuzz-x = <4>; 58 touchscreen-fuzz-y = <7>; 59 60 bootloader-key = /bits/ 8 <0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08>; 61 active-distance = <8>; 62 active-interval-ms = <0>; 63 lowpower-interval-ms = <200>; 64 touch-timeout-ms = <100>; 65 }; 66 67 /* ... */ 68 }; 69 70 &mcspi1 { 71 /* ... */ 72 cyttsp@0 { 73 compatible = "cypress,cyttsp-spi"; 74 spi-max-frequency = <6000000>; 75 reg = <0>; 76 interrupt-parent = <&gpio0>; 77 interrupts = <28 0>; 78 reset-gpios = <&gpio3 4 GPIO_ACTIVE_LOW>; 79 80 touchscreen-size-x = <800>; 81 touchscreen-size-y = <480>; 82 touchscreen-fuzz-x = <4>; 83 touchscreen-fuzz-y = <7>; 84 85 bootloader-key = /bits/ 8 <0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08>; 86 active-distance = <8>; 87 active-interval-ms = <0>; 88 lowpower-interval-ms = <200>; 89 touch-timeout-ms = <100>; 90 }; 91 92 /* ... */ 93 }; 94