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-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 = <&reg_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;
- };
- };