summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/input/touchscreen/ad7879.txt
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2016-03-18 07:51:52 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-18 07:51:52 +0300
commit10fdfee7f7fd8d4a6a8455ac4c9fbbc51d79b9f7 (patch)
treeace3300ec40d2a253c59a70ee37eb76fa53c859f /Documentation/devicetree/bindings/input/touchscreen/ad7879.txt
parent0f49fc95b86fc77b867d643e2d38bc9f28035ed4 (diff)
parent4d2508a55990c9b0fc1afb2c2cc5636712fd30f7 (diff)
downloadlinux-10fdfee7f7fd8d4a6a8455ac4c9fbbc51d79b9f7.tar.xz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
Pull input updates from Dmitry Torokhov: "The most notable item is addition of support for Synaptics RMI4 protocol which is native protocol for all current Synaptics devices (touchscreens, touchpads). In later releases we'll switch devices using HID and PS/2 protocol emulation to RMI4. You will also get: - BYD PS/2 touchpad protocol support for psmouse - MELFAS MIP4 Touchscreen driver - rotary encoder was moved away from legacy platform data and to generic device properties API, devm_* API, and can now handle encoders using more than 2 GPIOs - Cypress touchpad driver was switched to devm_* API and device properties - other assorted driver fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (40 commits) ARM: pxa/raumfeld: use PROPERTY_ENTRY_INTEGER to define props Input: synaptics-rmi4 - using logical instead of bitwise AND Input: powermate - fix oops with malicious USB descriptors Input: snvs_pwrkey - fix returned value check of syscon_regmap_lookup_by_phandle() MAINTAINERS: add devicetree bindings to Input Drivers section Input: synaptics-rmi4 - add device tree support to the SPI transport driver Input: synaptics-rmi4 - add SPI transport driver Input: synaptics-rmi4 - add support for F30 Input: synaptics-rmi4 - add support for F12 Input: synaptics-rmi4 - add device tree support for 2d sensors and F11 Input: synaptics-rmi4 - add support for 2D sensors and F11 Input: synaptics-rmi4 - add device tree support for RMI4 I2C devices Input: synaptics-rmi4 - add I2C transport driver Input: synaptics-rmi4 - add support for Synaptics RMI4 devices Input: ad7879 - add device tree support Input: ad7879 - fix default x/y axis assignment Input: ad7879 - move header to platform_data directory Input: ts4800 - add hardware dependency Input: cyapa - fix for losing events during device power transitions Input: sh_keysc - remove dependency on SUPERH ...
Diffstat (limited to 'Documentation/devicetree/bindings/input/touchscreen/ad7879.txt')
-rw-r--r--Documentation/devicetree/bindings/input/touchscreen/ad7879.txt53
1 files changed, 53 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/touchscreen/ad7879.txt b/Documentation/devicetree/bindings/input/touchscreen/ad7879.txt
new file mode 100644
index 000000000000..e3f22d23fc8f
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/ad7879.txt
@@ -0,0 +1,53 @@
+* 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>;
+ };