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From:   Mattijs Korpershoek <mkorpershoek@baylibre.com>
Date:   Wed, 20 Jul 2022 16:48:39 +0200
Subject: [PATCH v1 3/6] dt-bindings: mediatek,mt6779-keypad: add mediatek,double-keys
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Message-Id: <20220720-mt8183-keypad-v1-3-ef9fc29dbff4@baylibre.com>
References: <20220720-mt8183-keypad-v1-0-ef9fc29dbff4@baylibre.com>
In-Reply-To: <20220720-mt8183-keypad-v1-0-ef9fc29dbff4@baylibre.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Mattijs Korpershoek <mkorpershoek@baylibre.com>,
        Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        Matthias Brugger <matthias.bgg@gmail.com>
Cc:     linux-kernel@vger.kernel.org, linux-input@vger.kernel.org,
        Fabien Parent <parent.f@gmail.com>, devicetree@vger.kernel.org,
        linux-mediatek@lists.infradead.org,
        Fabien Parent <fparent@baylibre.com>,
        linux-arm-kernel@lists.infradead.org
Precedence: bulk

MediaTek keypad has 2 modes of detecting key events:
- single key: each (row, column) can detect one key
- double key: each (row, column) is a group of 2 keys

Currently, only single key detection is supported (by default)
Add an optional property, mediatek,double-keys to support double
key detection.

Double key support exists to minimize cost, since it reduces the number
of pins required for physical keys.

Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>

diff --git a/Documentation/devicetree/bindings/input/mediatek,mt6779-keypad.yaml b/Documentation/devicetree/bindings/input/mediatek,mt6779-keypad.yaml
index ca8ae40a73f7..03c9555849e5 100644
--- a/Documentation/devicetree/bindings/input/mediatek,mt6779-keypad.yaml
+++ b/Documentation/devicetree/bindings/input/mediatek,mt6779-keypad.yaml
@@ -49,6 +49,12 @@ properties:
     maximum: 256
     default: 16
 
+  mediatek,double-keys:
+    description: |
+      use double key matrix instead of single key
+      when set, each (row,column) is a group that can detect 2 keys
+    type: boolean
+
 required:
   - compatible
   - reg

-- 
b4 0.10.0-dev-54fef