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authorLinus Walleij <linus.walleij@linaro.org>2016-12-18 22:55:55 +0100
committerJonathan Cameron <jic23@kernel.org>2016-12-30 17:16:47 +0000
commit170df593a4e4b2750fe1a141bda5174c66206f3e (patch)
tree3e3c267ee123f6e2040da61d7e18a4fc3b95683a /Documentation/devicetree/bindings/iio/light
parent578f8d77089290a7c67989fe48ad9304f8b88e8f (diff)
iio: light: add DT bindings for Capella CM3605
This adds device tree bindings for the Capella Microsystems CM3605 ambient light sensor and short range proximity sensor. Cc: devicetree@vger.kernel.org Cc: Capella Microsystems <capellamicro@gmail.com> Cc: Kevin Tsai <ktsai@capellamicro.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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+Capella Microsystems CM3605
+Ambient Light and Short Distance Proximity Sensor
+
+The CM3605 is an entirely analog part which however require quite a bit of
+software logic to interface a host operating system.
+
+This ALS and proximity sensor was one of the very first deployed in mobile
+handsets, notably it is used in the very first Nexus One Android phone from
+2010.
+
+Required properties:
+- compatible: must be: "capella,cm3605"
+- aset-gpios: GPIO line controlling the ASET line (drive low
+ to activate the ALS, should be flagged GPIO_ACTIVE_LOW)
+- interrupts: the IRQ line (such as a GPIO) that is connected to
+ the POUT (proximity sensor out) line. The edge detection must
+ be set to IRQ_TYPE_EDGE_BOTH so as to detect movements toward
+ and away from the proximity sensor.
+- io-channels: the ADC channel used for converting the voltage from
+ AOUT to a digital representation.
+- io-channel-names: must be "aout"
+
+Optional properties:
+- vdd-supply: regulator supplying VDD power to the component.
+- capella,aset-resistance-ohms: the sensitivity calibration resistance,
+ in Ohms. Valid values are: 50000, 100000, 300000 and 600000,
+ as these are the resistance values that we are supplied with
+ calibration curves for. If not supplied, 100 kOhm will be assumed
+ but it is strongly recommended to supply this.
+
+Example:
+
+cm3605 {
+ compatible = "capella,cm3605";
+ vdd-supply = <&foo_reg>;
+ aset-gpios = <&foo_gpio 1 GPIO_ACTIVE_LOW>;
+ capella,aset-resistance-ohms = <100000>;
+ interrupts = <1 IRQ_TYPE_EDGE_BOTH>;
+ io-channels = <&adc 0x01>;
+ io-channel-names = "aout";
+};