summaryrefslogtreecommitdiffstats
path: root/Documentation/devicetree/bindings/input/touchscreen/bu21029.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/input/touchscreen/bu21029.txt')
-rw-r--r--Documentation/devicetree/bindings/input/touchscreen/bu21029.txt35
1 files changed, 35 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/input/touchscreen/bu21029.txt b/Documentation/devicetree/bindings/input/touchscreen/bu21029.txt
new file mode 100644
index 000000000..8daa0e868
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/bu21029.txt
@@ -0,0 +1,35 @@
+* Rohm BU21029 Touch Screen Controller
+
+Required properties:
+ - compatible : must be "rohm,bu21029"
+ - reg : i2c device address of the chip (0x40 or 0x41)
+ - interrupt-parent : the phandle for the gpio controller
+ - interrupts : (gpio) interrupt to which the chip is connected
+ - rohm,x-plate-ohms : x-plate resistance in Ohm
+
+Optional properties:
+ - reset-gpios : gpio pin to reset the chip (active low)
+ - touchscreen-size-x : horizontal resolution of touchscreen (in pixels)
+ - touchscreen-size-y : vertical resolution of touchscreen (in pixels)
+ - touchscreen-max-pressure: maximum pressure value
+ - vdd-supply : power supply for the controller
+
+Example:
+
+ &i2c1 {
+ /* ... */
+
+ bu21029: bu21029@40 {
+ compatible = "rohm,bu21029";
+ reg = <0x40>;
+ interrupt-parent = <&gpio1>;
+ interrupts = <4 IRQ_TYPE_EDGE_FALLING>;
+ reset-gpios = <&gpio6 16 GPIO_ACTIVE_LOW>;
+ rohm,x-plate-ohms = <600>;
+ touchscreen-size-x = <800>;
+ touchscreen-size-y = <480>;
+ touchscreen-max-pressure = <4095>;
+ };
+
+ /* ... */
+ };