1* Rohm BU21029 Touch Screen Controller 2 3Required properties: 4 - compatible : must be "rohm,bu21029" 5 - reg : i2c device address of the chip (0x40 or 0x41) 6 - interrupt-parent : the phandle for the gpio controller 7 - interrupts : (gpio) interrupt to which the chip is connected 8 - rohm,x-plate-ohms : x-plate resistance in Ohm 9 10Optional properties: 11 - reset-gpios : gpio pin to reset the chip (active low) 12 - touchscreen-size-x : horizontal resolution of touchscreen (in pixels) 13 - touchscreen-size-y : vertical resolution of touchscreen (in pixels) 14 - touchscreen-max-pressure: maximum pressure value 15 - vdd-supply : power supply for the controller 16 17Example: 18 19 &i2c1 { 20 /* ... */ 21 22 bu21029: bu21029@40 { 23 compatible = "rohm,bu21029"; 24 reg = <0x40>; 25 interrupt-parent = <&gpio1>; 26 interrupts = <4 IRQ_TYPE_EDGE_FALLING>; 27 reset-gpios = <&gpio6 16 GPIO_ACTIVE_LOW>; 28 rohm,x-plate-ohms = <600>; 29 touchscreen-size-x = <800>; 30 touchscreen-size-y = <480>; 31 touchscreen-max-pressure = <4095>; 32 }; 33 34 /* ... */ 35 }; 36