linux-kernel - [PATCH 2/2] ARM: dts: am335x-icev2: Add nodes for gpio-decoder

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Message-ID: <20160812045229.29241-3-vigneshr@ti.com>
Date:	Fri, 12 Aug 2016 10:22:29 +0530
From:	Vignesh R <vigneshr@...com>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@...linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	John Stultz <john.stultz@...aro.org>,
	S Twiss <stwiss.opensource@...semi.com>,
	Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@...aro.org>,
	Moritz Fischer <moritz.fischer@...us.com>,
	Daniel Hung-yu Wu <hywu@...gle.com>,
	Vignesh R <vigneshr@...com>,
	Grant Grundler <grundler@...omium.org>,
	<linux-input@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH 2/2] ARM: dts: am335x-icev2: Add nodes for gpio-decoder

AM335x ICE board has a rotary-switch connected to PCA9536 I2C GPIO
expander. The position of the rotary-switch is reflected by status of
GPIO lines. Add gpio-decoder node to read these GPIO line status via
gpio-decoder driver and report it as an input event to the system.

Signed-off-by: Vignesh R <vigneshr@...com>
---
 arch/arm/boot/dts/am335x-icev2.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/boot/dts/am335x-icev2.dts b/arch/arm/boot/dts/am335x-icev2.dts
index 7d8b8fefdf08..f2de594343f2 100644
--- a/arch/arm/boot/dts/am335x-icev2.dts
+++ b/arch/arm/boot/dts/am335x-icev2.dts
@@ -139,6 +139,15 @@
 			default-state = "off";
 		};
 	};
+	gpio-decoder0 {
+		compatible = "gpio-decoder";
+		gpios = <&pca9536 3 GPIO_ACTIVE_HIGH>,
+			<&pca9536 2 GPIO_ACTIVE_HIGH>,
+			<&pca9536 1 GPIO_ACTIVE_HIGH>,
+			<&pca9536 0 GPIO_ACTIVE_HIGH>;
+		linux,axis = <0>; /* ABS_X */
+		gpio-decoder,max-value = <9>;
+	};
 };
 
 &am33xx_pinmux {
-- 
2.9.2