[PATCH v3 3/5] dt-bindings: input: Add poll-interval property

["Michal Vokáč" <michal.vokac@ysoft.com>]

Add an option to periodicaly poll the device to get state of the inputs
as the interrupt line may not be used on some platforms.

Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com>
---
Changes since v2:
 - None

Changes since v1:
 - Use poll-interval instead of linux,poll-interval.
 - Place the poll-interval binding into the common schema.
 - Properly describe that either interrupts or poll-interval property is
   required.
 - Fix the example to pass validation.

 .../bindings/input/fsl,mpr121-touchkey.yaml        | 25 +++++++++++++++++++++-
 Documentation/devicetree/bindings/input/input.yaml |  4 ++++
 2 files changed, 28 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/input/fsl,mpr121-touchkey.yaml b/Documentation/devicetree/bindings/input/fsl,mpr121-touchkey.yaml
index c6fbcdf78556..035b2fee4491 100644
--- a/Documentation/devicetree/bindings/input/fsl,mpr121-touchkey.yaml
+++ b/Documentation/devicetree/bindings/input/fsl,mpr121-touchkey.yaml
@@ -17,6 +17,10 @@ description: |
 allOf:
   - $ref: input.yaml#
 
+oneOf:
+  - required: [ interrupts ]
+  - required: [ poll-interval ]
+
 properties:
   compatible:
     const: fsl,mpr121-touchkey
@@ -41,12 +45,12 @@ properties:
 required:
   - compatible
   - reg
-  - interrupts
   - vdd-supply
   - linux,keycodes
 
 examples:
   - |
+    // Example with interrupts
     #include "dt-bindings/input/input.h"
     i2c {
         #address-cells = <1>;
@@ -64,3 +68,22 @@ examples:
                              <KEY_8>, <KEY_9>, <KEY_A>, <KEY_B>;
         };
     };
+
+  - |
+    // Example with polling
+    #include "dt-bindings/input/input.h"
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        mpr121@5a {
+            compatible = "fsl,mpr121-touchkey";
+            reg = <0x5a>;
+            poll-interval = <20>;
+            autorepeat;
+            vdd-supply = <&ldo4_reg>;
+            linux,keycodes = <KEY_0>, <KEY_1>, <KEY_2>, <KEY_3>,
+                             <KEY_4>, <KEY_5>, <KEY_6>, <KEY_7>,
+                             <KEY_8>, <KEY_9>, <KEY_A>, <KEY_B>;
+        };
+    };
diff --git a/Documentation/devicetree/bindings/input/input.yaml b/Documentation/devicetree/bindings/input/input.yaml
index ca8fe84a2e62..6d519046b3af 100644
--- a/Documentation/devicetree/bindings/input/input.yaml
+++ b/Documentation/devicetree/bindings/input/input.yaml
@@ -24,6 +24,10 @@ properties:
           minimum: 0
           maximum: 0xff
 
+  poll-interval:
+    description: Poll interval time in milliseconds.
+    $ref: /schemas/types.yaml#/definitions/uint32
+
   power-off-time-sec:
     description:
       Duration in seconds which the key should be kept pressed for device to
-- 
2.1.4