Device tree bindings for TI's ADS7843, ADS7845, ADS7846, ADS7873, TSC2046 SPI driven touch screen controllers. The node for this driver must be a child node of a SPI controller, hence all mandatory properties described in Documentation/devicetree/bindings/spi/spi-bus.txt must be specified. Additional required properties: compatible Must be one of the following, depending on the model: "ti,tsc2046" "ti,ads7843" "ti,ads7845" "ti,ads7846" "ti,ads7873" interrupt-parent interrupts An interrupt node describing the IRQ line the chip's !PENIRQ pin is connected to. vcc-supply A regulator node for the supply voltage. Optional properties: ti,vref-delay-usecs vref supply delay in usecs, 0 for external vref (u16). ti,vref-mv The VREF voltage, in millivolts (u16). Set to 0 to use internal references (ADS7846). ti,keep-vref-on set to keep vref on for differential measurements as well ti,swap-xy swap x and y axis ti,settle-delay-usec Settling time of the analog signals; a function of Vcc and the capacitance on the X/Y drivers. If set to non-zero, two samples are taken with settle_delay us apart, and the second one is used. ~150 uSec with 0.01uF caps (u16). ti,penirq-recheck-delay-usecs If set to non-zero, after samples are taken this delay is applied and penirq is rechecked, to help avoid false events. This value is affected by the material used to build the touch layer (u16). ti,x-plate-ohms Resistance of the X-plate, in Ohms (u16). ti,y-plate-ohms Resistance of the Y-plate, in Ohms (u16). ti,x-min Minimum value on the X axis (u16). ti,y-min Minimum value on the Y axis (u16). ti,x-max Maximum value on the X axis (u16). ti,y-max Minimum value on the Y axis (u16). ti,pressure-min Minimum reported pressure value (threshold) - u16. ti,pressure-max Maximum reported pressure value (u16). ti,debounce-max Max number of additional readings per sample (u16). ti,debounce-tol Tolerance used for filtering (u16). ti,debounce-rep Additional consecutive good readings required after the first two (u16). ti,pendown-gpio-debounce Platform specific debounce time for the pendown-gpio (u32). pendown-gpio GPIO handle describing the pin the !PENIRQ line is connected to. wakeup-source use any event on touchscreen as wakeup event. (Legacy property support: "linux,wakeup") Example for a TSC2046 chip connected to an McSPI controller of an OMAP SoC:: spi_controller { tsc2046@0 { reg = <0>; /* CS0 */ compatible = "ti,tsc2046"; interrupt-parent = <&gpio1>; interrupts = <8 0>; /* BOOT6 / GPIO 8 */ spi-max-frequency = <1000000>; pendown-gpio = <&gpio1 8 0>; vcc-supply = <®_vcc3>; ti,x-min = /bits/ 16 <0>; ti,x-max = /bits/ 16 <8000>; ti,y-min = /bits/ 16 <0>; ti,y-max = /bits/ 16 <4800>; ti,x-plate-ohms = /bits/ 16 <40>; ti,pressure-max = /bits/ 16 <255>; wakeup-source; }; };