Input: touchscreen - add imx6ul_tsc driver support

Freescale i.MX6UL contains a internal touchscreen controller,
this patch add a driver to support this controller.

Signed-off-by: Haibo Chen <haibo.chen@freescale.com>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt b/Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt
new file mode 100644
index 000000000000..853dff96dd9f
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/imx6ul_tsc.txt
@@ -0,0 +1,36 @@
+* Freescale i.MX6UL Touch Controller
+
+Required properties:
+- compatible: must be "fsl,imx6ul-tsc".
+- reg: this touch controller address and the ADC2 address.
+- interrupts: the interrupt of this touch controller and ADC2.
+- clocks: the root clock of touch controller and ADC2.
+- clock-names; must be "tsc" and "adc".
+- xnur-gpio: the X- gpio this controller connect to.
+  This xnur-gpio returns to low once the finger leave the touch screen (The
+  last touch event the touch controller capture).
+
+Optional properties:
+- measure-delay-time: the value of measure delay time.
+  Before X-axis or Y-axis measurement, the screen need some time before
+  even potential distribution ready.
+  This value depends on the touch screen.
+- pre-charge-time: the touch screen need some time to precharge.
+  This value depends on the touch screen.
+
+Example:
+        tsc: tsc@02040000 {
+                compatible = "fsl,imx6ul-tsc";
+                reg = <0x02040000 0x4000>, <0x0219c000 0x4000>;
+                interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>,
+                             <GIC_SPI 101 IRQ_TYPE_LEVEL_HIGH>;
+                clocks = <&clks IMX6UL_CLK_IPG>,
+                         <&clks IMX6UL_CLK_ADC2>;
+                clock-names = "tsc", "adc";
+                pinctrl-names = "default";
+                pinctrl-0 = <&pinctrl_tsc>;
+                xnur-gpio = <&gpio1 3 GPIO_ACTIVE_LOW>;
+                measure-delay-time = <0xfff>;
+                pre-charge-time = <0xffff>;
+                status = "okay";
+        };