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@xxxxxx>
---
v2: Update DT node name.
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 bc0190e4f10f..d3c53e5910c4 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-decoder {
+ 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 */
+ decoder,max-value = <9>;
+ };
};
&am33xx_pinmux {
--
2.9.2
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