Commit 25ec2496 authored by Tony Lindgren's avatar Tony Lindgren Committed by Jonathan Cameron
Browse files

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: default avatarTony Lindgren <tony@atomide.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent b71244b6

Documentation/devicetree/bindings/iio/adc/cpcap-adc.txt

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Motorola CPCAP PMIC ADC binding



Required properties:

- compatible: Should be "motorola,cpcap-adc" or "motorola,mapphone-cpcap-adc"

- interrupt-parent: The interrupt controller

- interrupts: The interrupt number for the ADC device

- interrupt-names: Should be "adcdone"

- #io-channel-cells: Number of cells in an IIO specifier



Example:



cpcap_adc: adc {

	compatible = "motorola,mapphone-cpcap-adc";

	interrupt-parent = <&cpcap>;

	interrupts = <8 IRQ_TYPE_NONE>;

	interrupt-names = "adcdone";

	#io-channel-cells = <1>;

};

drivers/iio/adc/Kconfig

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@@ -195,6 +195,17 @@ config CC10001_ADC 
	  This driver can also be built as a module. If so, the module will be

	  called cc10001_adc.



config CPCAP_ADC

	tristate "Motorola CPCAP PMIC ADC driver"

	depends on MFD_CPCAP

	select IIO_BUFFER

	select IIO_TRIGGERED_BUFFER

	help

	  Say yes here to build support for Motorola CPCAP PMIC ADC.



	  This driver can also be built as a module. If so, the module will be

	  called cpcap-adc.



config DA9150_GPADC

	tristate "Dialog DA9150 GPADC driver support"

	depends on MFD_DA9150

drivers/iio/adc/Makefile

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@@ -20,6 +20,7 @@ obj-$(CONFIG_AXP288_ADC) += axp288_adc.o 
obj-$(CONFIG_BCM_IPROC_ADC) += bcm_iproc_adc.o

obj-$(CONFIG_BERLIN2_ADC) += berlin2-adc.o

obj-$(CONFIG_CC10001_ADC) += cc10001_adc.o

obj-$(CONFIG_CPCAP_ADC) += cpcap-adc.o

obj-$(CONFIG_DA9150_GPADC) += da9150-gpadc.o

obj-$(CONFIG_ENVELOPE_DETECTOR) += envelope-detector.o

obj-$(CONFIG_EXYNOS_ADC) += exynos_adc.o

drivers/iio/adc/cpcap-adc.c

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