linux-kernel - [RFC PATCH 1/4] dt-bindings: input: Add support for the MPR121 without interrupt line

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Date:   Fri, 26 Apr 2019 10:30:17 +0200
From:   Michal Vokáč <michal.vokac@...ft.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        linux-input@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Michal Vokáč <michal.vokac@...ft.com>
Subject: [RFC PATCH 1/4] dt-bindings: input: Add support for the MPR121 without interrupt line

Normally, the MPR121 controller uses separate interrupt line to notify
the I2C host that a key was touched/released. To support platforms that
can not use the interrupt line, polling of the MPR121 registers can be
used.

Signed-off-by: Michal Vokáč <michal.vokac@...ft.com>
---
 .../bindings/input/mpr121-touchkey-polled.txt      | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt

diff --git a/Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt b/Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt
new file mode 100644
index 000000000000..6bb1d312614c
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/mpr121-touchkey-polled.txt
@@ -0,0 +1,26 @@
+* Freescale MPR121 Controller without interrupt line
+
+Required Properties:
+- compatible:		Should be "fsl,mpr121-touchkey-polled"
+- reg:			The I2C slave address of the device.
+- vdd-supply:		Phandle to the Vdd power supply.
+- linux,keycodes:	Specifies an array of numeric keycode values to
+			be used for reporting button presses. The array can
+			contain up to 12 entries.
+
+Optional Properties:
+- autorepeat:		Enable autorepeat feature.
+
+Example:
+
+#include "dt-bindings/input/input.h"
+
+	touchkeys: keys@5a {
+		compatible = "fsl,mpr121-touchkey-polled";
+		reg = <0x5a>;
+		autorepeat;
+		vdd-supply = <&ldo4_reg>;
+		linux,keycodes = <KEY_0>, <KEY_1>, <KEY_2>, <KEY_3>,
+				<KEY_4> <KEY_5>, <KEY_6>, <KEY_7>,
+				<KEY_8>, <KEY_9>, <KEY_A>, <KEY_B>;
+	};
-- 
2.1.4