linux-kernel - [RFC PATCH v1 2/3] dt-bindings: touchscreen: resistive-adc-touch: add support for z1 and z2 channels

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Message-Id: <20210517125909.12024-3-o.rempel@pengutronix.de>
Date:   Mon, 17 May 2021 14:59:08 +0200
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc:     Oleksij Rempel <o.rempel@...gutronix.de>, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        David Jander <david@...tonic.nl>, devicetree@...r.kernel.org
Subject: [RFC PATCH v1 2/3] dt-bindings: touchscreen: resistive-adc-touch: add support for z1 and z2 channels

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@...gutronix.de>
---
 .../bindings/input/touchscreen/resistive-adc-touch.yaml  | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
index 53df21a6589e..538c3b1ef1e1 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.yaml
@@ -43,6 +43,7 @@ properties:
   touchscreen-inverted-y: true
   touchscreen-swapped-x-y: true
   touchscreen-min-pressure: true
+  touchscreen-x-plate-ohms: true
 
 additionalProperties: false
 
@@ -59,3 +60,11 @@ examples:
       io-channels = <&adc 24>, <&adc 25>, <&adc 26>;
       io-channel-names = "x", "y", "pressure";
     };
+  - |
+    resistive_touch {
+      compatible = "resistive-adc-touch";
+      touchscreen-min-pressure = <50000>;
+      io-channels = <&adc 1>, <&adc 2>, <&adc 3>, <&adc 4>;
+      io-channel-names = "x", "y", "z1", "z2";
+      touchscreen-x-plate-ohms = <800>;
+    };
-- 
2.29.2