ad7879.txt

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    1 * Analog Devices AD7879(-1)/AD7889(-1) touchscreen interface (SPI/I2C)
    2 
    3 Required properties:
    4 - compatible                    : for SPI slave, use "adi,ad7879"
    5                                   for I2C slave, use "adi,ad7879-1"
    6 - reg                           : SPI chipselect/I2C slave address
    7                                   See spi-bus.txt for more SPI slave properties
    8 - interrupts                    : touch controller interrupt
    9 - touchscreen-max-pressure      : maximum reported pressure
   10 - adi,resistance-plate-x        : total resistance of X-plate (for pressure
   11                                   calculation)
   12 Optional properties:
   13 - touchscreen-swapped-x-y       : X and Y axis are swapped (boolean)
   14 - adi,first-conversion-delay    : 0-12: In 128us steps (starting with 128us)
   15                                   13  : 2.560ms
   16                                   14  : 3.584ms
   17                                   15  : 4.096ms
   18                                   This property has to be a '/bits/ 8' value
   19 - adi,acquisition-time          : 0: 2us
   20                                   1: 4us
   21                                   2: 8us
   22                                   3: 16us
   23                                   This property has to be a '/bits/ 8' value
   24 - adi,median-filter-size        : 0: disabled
   25                                   1: 4 measurements
   26                                   2: 8 measurements
   27                                   3: 16 measurements
   28                                   This property has to be a '/bits/ 8' value
   29 - adi,averaging                 : 0: 2 middle values (1 if median disabled)
   30                                   1: 4 middle values
   31                                   2: 8 middle values
   32                                   3: 16 values
   33                                   This property has to be a '/bits/ 8' value
   34 - adi,conversion-interval:      : 0    : convert one time only
   35                                   1-255: 515us + val * 35us (up to 9.440ms)
   36                                   This property has to be a '/bits/ 8' value
   37 - gpio-controller               : Switch AUX/VBAT/GPIO pin to GPIO mode
   38 
   39 Example:
   40 
   41         touchscreen0@2c {
   42                 compatible = "adi,ad7879-1";
   43                 reg = <0x2c>;
   44                 interrupt-parent = <&gpio1>;
   45                 interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
   46                 touchscreen-max-pressure = <4096>;
   47                 adi,resistance-plate-x = <120>;
   48                 adi,first-conversion-delay = /bits/ 8 <3>;
   49                 adi,acquisition-time = /bits/ 8 <1>;
   50                 adi,median-filter-size = /bits/ 8 <2>;
   51                 adi,averaging = /bits/ 8 <1>;
   52                 adi,conversion-interval = /bits/ 8 <255>;
   53         };
   54 
   55         touchscreen1@1 {
   56                 compatible = "adi,ad7879";
   57                 spi-max-frequency = <5000000>;
   58                 reg = <1>;
   59                 spi-cpol;
   60                 spi-cpha;
   61                 gpio-controller;
   62                 interrupt-parent = <&gpio1>;
   63                 interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
   64                 touchscreen-max-pressure = <4096>;
   65                 adi,resistance-plate-x = <120>;
   66                 adi,first-conversion-delay = /bits/ 8 <3>;
   67                 adi,acquisition-time = /bits/ 8 <1>;
   68                 adi,median-filter-size = /bits/ 8 <2>;
   69                 adi,averaging = /bits/ 8 <1>;
   70                 adi,conversion-interval = /bits/ 8 <255>;
   71         };

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sys/contrib/device-tree/Bindings/input/touchscreen/ad7879.txt