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From: Oleksij Rempel <o.rempel@pengutronix.de>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Cc: Oleksij Rempel <o.rempel@pengutronix.de>,
	Rob Herring <robh@kernel.org>,
	kernel@pengutronix.de, linux-kernel@vger.kernel.org,
	linux-input@vger.kernel.org, David Jander <david@protonic.nl>,
	devicetree@vger.kernel.org
Subject: [PATCH v6 3/4] dt-bindings: touchscreen: resistive-adc-touch: add support for z1 and z2 channels
Date: Tue, 25 May 2021 07:46:33 +0200	[thread overview]
Message-ID: <20210525054634.9134-4-o.rempel@pengutronix.de> (raw)
In-Reply-To: <20210525054634.9134-1-o.rempel@pengutronix.de>

For pressure calculation based on plates resistance we need some additional
properties:
- z1 and z2 channels with additional measurements between plates
- actual resistance of the touchscreen. Currently we use only
  X-resistance.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Rob Herring <robh@kernel.org>
---
 .../input/touchscreen/resistive-adc-touch.yaml   | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
index 38b4cbee9429..7fc22a403d48 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
@@ -27,6 +27,8 @@ properties:
       - description: x
       - description: y
       - description: pressure (optional)
+      - description: z1 (optional)
+      - description: z2 (optional)
 
   io-channel-names:
     oneOf:
@@ -37,6 +39,11 @@ properties:
           - enum: [x, y, pressure]
           - enum: [x, y, pressure]
           - enum: [x, y, pressure]
+      - items:
+          - enum: [x, y, z1, z2]
+          - enum: [x, y, z1, z2]
+          - enum: [x, y, z1, z2]
+          - enum: [x, y, z1, z2]
 
   touchscreen-size-x: true
   touchscreen-size-y: true
@@ -46,6 +53,7 @@ properties:
   touchscreen-inverted-y: true
   touchscreen-swapped-x-y: true
   touchscreen-min-pressure: true
+  touchscreen-x-plate-ohms: true
 
 additionalProperties: false
 
@@ -68,3 +76,11 @@ examples:
       io-channels = <&adc 24>, <&adc 25>, <&adc 26>;
       io-channel-names = "y", "pressure", "x";
     };
+  - |
+    touchscreen {
+      compatible = "resistive-adc-touch";
+      touchscreen-min-pressure = <50000>;
+      io-channels = <&adc 1>, <&adc 2>, <&adc 3>, <&adc 4>;
+      io-channel-names = "x", "z1", "z2", "y";
+      touchscreen-x-plate-ohms = <800>;
+    };
-- 
2.29.2


  parent reply	other threads:[~2021-05-25  5:46 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-25  5:46 [PATCH v6 0/4] add z1 and z2 channels support for resistive-adc-touch driver Oleksij Rempel
2021-05-25  5:46 ` [PATCH v6 1/4] dt-bindings: touchscreen: Convert resistive-adc-touch binding to json schema Oleksij Rempel
2021-05-25  5:46 ` [PATCH v6 2/4] dt-bindings: touchscreen: add touchscreen-x/y-plate-ohms property Oleksij Rempel
2021-05-25  5:46 ` Oleksij Rempel [this message]
2021-05-25  5:46 ` [PATCH v6 4/4] Input: resistive-adc-touch: add support for z1 and z2 channels Oleksij Rempel
2021-05-25 20:06 ` [PATCH v6 0/4] add z1 and z2 channels support for resistive-adc-touch driver Dmitry Torokhov
2021-06-02 11:15 ` Eugen.Hristev
2021-06-07  9:22   ` Oleksij Rempel

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