add binding information for tps6507x touchscreen input.

Signed-off-by: Sushaanth Srirangapathi <sushaant...@ti.com>
---
 Documentation/devicetree/bindings/mfd/tps6507x.txt |   12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/mfd/tps6507x.txt 
b/Documentation/devicetree/bindings/mfd/tps6507x.txt
index 8fffa3c..74c768b 100644
--- a/Documentation/devicetree/bindings/mfd/tps6507x.txt
+++ b/Documentation/devicetree/bindings/mfd/tps6507x.txt
@@ -23,6 +23,8 @@ Required properties:
        vindcdc1_2-supply: VDCDC1 and VDCDC2 input.
        vindcdc3-supply  : VDCDC3 input.
        vldo1_2-supply   : VLDO1 and VLDO2 input.
+- touchscreen: This is child node which specify touchscreen
+  properties.
 
 Regulator Optional properties:
 - defdcdc_default: It's property of DCDC2 and DCDC3 regulators.
@@ -30,6 +32,12 @@ Regulator Optional properties:
                        1: If defdcdc pin of DCDC2/DCDC3 is driven HIGH.
   If this property is not defined, it defaults to 0 (not enabled).
 
+Touchscreen Optional properties:
+- ti,min-pressure : pressure level above which the event is considered as a
+                   valid touch.
+This binding was not added as a generic binding because there was no driver
+using such a property.
+
 Example:
 
        pmu: tps6507x@48 {
@@ -87,5 +95,7 @@ Example:
                                regulator-boot-on;
                        };
                };
-
+               touchscreen {
+                       ti,min-pressure = <0x30>;
+               };
        };
-- 
1.7.9.5

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