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- * Analog Devices AD7879(-1)/AD7889(-1) touchscreen interface (SPI/I2C)
- Required properties:
- - compatible : for SPI slave, use "adi,ad7879"
- for I2C slave, use "adi,ad7879-1"
- - reg : SPI chipselect/I2C slave address
- See spi-bus.txt for more SPI slave properties
- - interrupt-parent : the phandle for the interrupt controller
- - interrupts : touch controller interrupt
- - touchscreen-max-pressure : maximum reported pressure
- - adi,resistance-plate-x : total resistance of X-plate (for pressure
- calculation)
- Optional properties:
- - touchscreen-swapped-x-y : X and Y axis are swapped (boolean)
- - adi,first-conversion-delay : 0-12: In 128us steps (starting with 128us)
- 13 : 2.560ms
- 14 : 3.584ms
- 15 : 4.096ms
- This property has to be a '/bits/ 8' value
- - adi,acquisition-time : 0: 2us
- 1: 4us
- 2: 8us
- 3: 16us
- This property has to be a '/bits/ 8' value
- - adi,median-filter-size : 0: disabled
- 1: 4 measurements
- 2: 8 measurements
- 3: 16 measurements
- This property has to be a '/bits/ 8' value
- - adi,averaging : 0: 2 middle values (1 if median disabled)
- 1: 4 middle values
- 2: 8 middle values
- 3: 16 values
- This property has to be a '/bits/ 8' value
- - adi,conversion-interval: : 0 : convert one time only
- 1-255: 515us + val * 35us (up to 9.440ms)
- This property has to be a '/bits/ 8' value
- Example:
- ad7879@2c {
- compatible = "adi,ad7879-1";
- reg = <0x2c>;
- interrupt-parent = <&gpio1>;
- interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
- touchscreen-max-pressure = <4096>;
- adi,resistance-plate-x = <120>;
- adi,first-conversion-delay = /bits/ 8 <3>;
- adi,acquisition-time = /bits/ 8 <1>;
- adi,median-filter-size = /bits/ 8 <2>;
- adi,averaging = /bits/ 8 <1>;
- adi,conversion-interval = /bits/ 8 <255>;
- };
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