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From: =?UTF-8?q?Michal=20Vok=C3=A1=C4=8D?= <michal.vokac@ysoft.com>
Subject: [PATCH input-next 2/4] dt-bindings: input: mpr121: Add poll-interval property
Date: Mon,  2 Sep 2019 13:40:15 +0200
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To: Dmitry Torokhov <dmitry.torokhov@gmail.com>, Rob Herring <robh+dt@kernel.org>
Cc: Shawn Guo <shawnguo@kernel.org>, Fabio Estevam <festevam@gmail.com>, linux-input@vger.kernel.org, devicetree@vger.kernel.org, =?UTF-8?q?Michal=20Vok=C3=A1=C4=8D?= <michal.vokac@ysoft.com>
List-ID: <devicetree@vger.kernel.org>

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

Signed-off-by: Michal Vokáč <michal.vokac@ysoft.com>
---
I am not sure how to propperly handle this.
Either interrupt or linux,poll-interval is required, but not both.

 .../bindings/input/fsl,mpr121-touchkey.yaml          | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/input/fsl,mpr121-touchkey.yaml b/Documentation/devicetree/bindings/input/fsl,mpr121-touchkey.yaml
index c463c1c81755..2b3073a3c9f4 100644
--- a/Documentation/devicetree/bindings/input/fsl,mpr121-touchkey.yaml
+++ b/Documentation/devicetree/bindings/input/fsl,mpr121-touchkey.yaml
@@ -34,6 +34,10 @@ properties:
     minItems: 1
     maxItems: 12
 
+  linux,poll-interval:
+    description: Poll interval time in milliseconds.
+    maxItems: 1
+
   wakeup-source: Use any event on keypad as wakeup event.
     type: boolean
 
@@ -44,12 +48,12 @@ properties:
 required:
   - compatible
   - reg
-  - interrupts
   - vdd-supply
   - linux,keycodes
 
 examples:
   - |
+    // Example with interrupts
     #include "dt-bindings/input/input.h"
     touchkey: mpr121@5a {
         compatible = "fsl,mpr121-touchkey";
@@ -62,3 +66,17 @@ examples:
                          <KEY_4> <KEY_5>, <KEY_6>, <KEY_7>,
                          <KEY_8>, <KEY_9>, <KEY_A>, <KEY_B>;
     };
+
+  - |
+    // Example with polling
+    #include "dt-bindings/input/input.h"
+    touchkey: mpr121@5a {
+        compatible = "fsl,mpr121-touchkey";
+        reg = <0x5a>;
+        linux,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>;
+    );
-- 
2.1.4