From: Eugen Hristev <eugen.hristev@microchip.com>
To: <jic23@kernel.org>, <ludovic.desroches@microchip.com>,
<alexandre.belloni@bootlin.com>,
<linux-arm-kernel@lists.infradead.org>,
<devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
<linux-iio@vger.kernel.org>, <linux-input@vger.kernel.org>,
<nicolas.ferre@microchip.com>, <dmitry.torokhov@gmail.com>,
<robh@kernel.org>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Subject: [PATCH v4 4/9] dt-bindings: input: touchscreen: resistive-adc-touch: create bindings
Date: Mon, 30 Apr 2018 13:32:10 +0300 [thread overview]
Message-ID: <1525084335-11276-5-git-send-email-eugen.hristev@microchip.com> (raw)
In-Reply-To: <1525084335-11276-1-git-send-email-eugen.hristev@microchip.com>
Added bindings for generic resistive touchscreen ADC.
Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
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
next prev parent reply other threads:[~2018-04-30 10:35 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-30 10:32 [PATCH v4 0/9] Add support for SAMA5D2 touchscreen Eugen Hristev
2018-04-30 10:32 ` [PATCH v4 1/9] MAINTAINERS: add generic resistive touchscreen adc Eugen Hristev
2018-04-30 10:32 ` [PATCH v4 2/9] iio: Add channel for Position Relative Eugen Hristev
2018-04-30 10:32 ` [PATCH v4 3/9] dt-bindings: input: touchscreen: add pressure threshold touchscreen property Eugen Hristev
2018-05-07 22:38 ` Dmitry Torokhov
2018-04-30 10:32 ` Eugen Hristev [this message]
2018-04-30 10:32 ` [PATCH v4 5/9] iio: adc: at91-sama5d2_adc: add support for position and pressure channels Eugen Hristev
2018-05-06 17:29 ` Jonathan Cameron
2018-05-06 17:59 ` Alexandre Belloni
2018-05-07 6:18 ` Eugen Hristev
2018-05-07 10:28 ` Alexandre Belloni
2018-05-07 10:40 ` Eugen Hristev
2018-04-30 10:32 ` [PATCH v4 6/9] input: touchscreen: resistive-adc-touch: add generic resistive ADC touchscreen Eugen Hristev
2018-05-06 17:33 ` Jonathan Cameron
2018-04-30 10:32 ` [PATCH v4 7/9] dt-bindings: iio: adc: at91-sama5d2_adc: add channel specific consumer info Eugen Hristev
2018-04-30 10:32 ` [PATCH v4 8/9] ARM: dts: at91: sama5d2: add channel cells for ADC device Eugen Hristev
2018-04-30 10:32 ` [PATCH v4 9/9] ARM: dts: at91: sama5d2: Add resistive touch device Eugen Hristev
2018-05-06 19:04 ` [PATCH v4 0/9] Add support for SAMA5D2 touchscreen Jonathan Cameron
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