linux-kernel - [PATCH v3 05/11] dt-bindings: input: touchscreen: resistive-adc-touch: create bindings

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1523350677-27106-6-git-send-email-eugen.hristev@microchip.com>
Date:   Tue, 10 Apr 2018 11:57:51 +0300
From:   Eugen Hristev <eugen.hristev@...rochip.com>
To:     <jic23@...nel.org>, <ludovic.desroches@...rochip.com>,
        <alexandre.belloni@...tlin.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-iio@...r.kernel.org>, <linux-input@...r.kernel.org>,
        <nicolas.ferre@...rochip.com>, <dmitry.torokhov@...il.com>,
        <robh@...nel.org>
CC:     Eugen Hristev <eugen.hristev@...rochip.com>
Subject: [PATCH v3 05/11] dt-bindings: input: touchscreen: resistive-adc-touch: create bindings

Added bindings for generic resistive touchscreen ADC.

Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
---
Changes in v3:
 - renamed file and compatible to exclude "generic" keyword
 - removed the pressure threshold property, added it as a common
touchscreen property in the touchscreen common bindings in a separate
commit.

Changes in v2:
 - modified bindings to have a generic resistive touchscreen adc driver
instead of specific architecture one.

 .../input/touchscreen/resistive-adc-touch.txt      | 30 ++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt

diff --git a/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
new file mode 100644
index 0000000..1c4e4a8
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/resistive-adc-touch.txt
@@ -0,0 +1,30 @@
+Generic resistive touchscreen ADC
+
+Required properties:
+
+ - compatible: must be "resistive-adc-touch"
+The device must be connected to an ADC device that provides channels for
+position measurement and optional pressure.
+Refer to ../iio/iio-bindings.txt for details
+ - iio-channels: must have at least two channels connected to an ADC device.
+These should correspond to the channels exposed by the ADC device and should
+have the right index as the ADC device registers them. These channels
+represent the relative position on the "x" and "y" axes.
+ - iio-channel-names: must have all the channels' names. Mandatory channels
+are "x" and "y".
+
+Optional properties:
+ - iio-channels: The third channel named "pressure" is optional and can be
+used if the ADC device also measures pressure besides position.
+If this channel is missing, pressure will be ignored and the touchscreen
+will only report position.
+ - iio-channel-names: optional channel named "pressure".
+
+Example:
+
+	resistive_touch: resistive_touch {
+		compatible = "resistive-adc-touch";
+		touchscreen-threshold-pressure = <50000>;
+		io-channels = <&adc 24>, <&adc 25>, <&adc 26>;
+		io-channel-names = "x", "y", "pressure";
+	};
-- 
2.7.4