linux-kernel - [RFC PATCH v2 1/4] dt-bindings: input: Add support for the MPR121 without interrupt line

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Date:   Fri, 17 May 2019 15:12:50 +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 v2 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>
---
Changes since v1:
- Document the polled binding in the original file, do not create a new one.
  (Rob)

 Documentation/devicetree/bindings/input/mpr121-touchkey.txt | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/mpr121-touchkey.txt b/Documentation/devicetree/bindings/input/mpr121-touchkey.txt
index b7c61ee5841b..97f55273d473 100644
--- a/Documentation/devicetree/bindings/input/mpr121-touchkey.txt
+++ b/Documentation/devicetree/bindings/input/mpr121-touchkey.txt
@@ -1,9 +1,14 @@
-* Freescale MPR121 Controllor
+* Freescale MPR121 Controller
 
 Required Properties:
-- compatible:		Should be "fsl,mpr121-touchkey"
+- compatible:		Should be one of:
+			- "fsl,mpr121-touchkey" - MPR121 with interrupt line
+			- "fsl,mpr121-touchkey-polled" - MPR121 with polling
 - reg:			The I2C slave address of the device.
 - interrupts:		The interrupt number to the cpu.
+			In case of "fsl,mpr121-touchkey-polled" the interrupt
+			line is not used and hence the interrupts property is
+			not required.
 - 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
-- 
2.1.4