adc-keys, unlike gpio-keys, does not allow linux,input-type as a valid
property. This makes it impossible to model devices that have ADC inputs
that should generate switch events.

Replace "additionalProperties" with "unevaluatedProperties", so that any
of the properties in the referenced input.yaml schema can be used.
Consequently, throw out the explicit mention of "linux,code" and extend
the example to verify.

Suggested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
---
 Documentation/devicetree/bindings/input/adc-keys.yaml | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/adc-keys.yaml b/Documentation/devicetree/bindings/input/adc-keys.yaml
index 7aa078dead37..f216bb874f26 100644
--- a/Documentation/devicetree/bindings/input/adc-keys.yaml
+++ b/Documentation/devicetree/bindings/input/adc-keys.yaml
@@ -33,15 +33,13 @@ patternProperties:
   '^button-':
     type: object
     $ref: input.yaml#
-    additionalProperties: false
+    unevaluatedProperties: false
     description:
       Each button (key) is represented as a sub-node.
 
     properties:
       label: true
 
-      linux,code: true
-
       press-threshold-microvolt:
         description:
           Voltage above or equal to which this key is considered pressed. No
@@ -65,7 +63,9 @@ examples:
   - |
     #include <dt-bindings/input/input.h>
     // +--------------------------------+------------------------+
-    // | 2.000.000 <= value             | no key pressed         |
+    // | 2.500.000 <= value             | no key pressed         |
+    // +--------------------------------+------------------------+
+    // | 2.000.000 <= value < 2.500.000 | Mic Insert Switch on   |
     // +--------------------------------+------------------------+
     // | 1.500.000 <= value < 2.000.000 | KEY_VOLUMEUP pressed   |
     // +--------------------------------+------------------------+
@@ -80,7 +80,14 @@ examples:
         compatible = "adc-keys";
         io-channels = <&lradc 0>;
         io-channel-names = "buttons";
-        keyup-threshold-microvolt = <2000000>;
+        keyup-threshold-microvolt = <2500000>;
+
+        button-headset-connected {
+          label = "Headset Microphone Connected";
+          linux,code = <SW_MICROPHONE_INSERT>;
+          linux,input-type = <EV_SW>;
+          press-threshold-microvolt = <2000000>;
+        };
 
         button-up {
             label = "Volume Up";

-- 
2.53.0