iio: adc: cpcap: Add minimal support for CPCAP PMIC ADC
On Motorola phones like droid 4 there is a custom CPCAP PMIC. This PMIC has ADCs that are used for battery charging and USB PHY VBUS and ID pin detection. Unfortunately the only documentation for this ADC seems to be the Motorola mapphone Linux kernel tree. I have tested that reading raw and scaled values works, but I have not used the timed sampling that the ADC seems to support. Let's add a minimal support for it so we can eventually provide IIO channels for the related battery charging and USB PHY drivers. Cc: devicetree@vger.kernel.org Cc: Marcel Partap <mpartap@gmx.net> Cc: Michael Scott <michael.scott@linaro.org> Cc: Sebastian Reichel <sre@kernel.org> Signed-off-by: Tony Lindgren <tony@atomide.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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Tony Lindgren