mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 21:54:06 +08:00
a608026eac
Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
92 lines
2.9 KiB
Plaintext
92 lines
2.9 KiB
Plaintext
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).
|
|
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.
|
|
linux,wakeup use any event on touchscreen as wakeup event.
|
|
|
|
|
|
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>;
|
|
|
|
linux,wakeup;
|
|
};
|
|
};
|