d6f087ec9c
Changes since v1: IIO: ADC: AD7780: Apply review feedback Abort probe() with error in case platform_data is not present. Add comment explaining power down reset (PDRST) GPIO handling and dual function DOUT/RDY interrupt usage. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
31 lines
753 B
C
31 lines
753 B
C
/*
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* AD7780/AD7781 SPI ADC driver
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*
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* Copyright 2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#ifndef IIO_ADC_AD7780_H_
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#define IIO_ADC_AD7780_H_
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/*
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* TODO: struct ad7780_platform_data needs to go into include/linux/iio
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*/
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/* NOTE:
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* The AD7780 doesn't feature a dedicated SPI chip select, in addition it
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* features a dual use data out ready DOUT/RDY output.
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* In order to avoid contentions on the SPI bus, it's therefore necessary
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* to use spi bus locking combined with a dedicated GPIO to control the
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* power down reset signal of the AD7780.
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*
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* The DOUT/RDY output must also be wired to an interrupt capable GPIO.
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*/
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struct ad7780_platform_data {
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u16 vref_mv;
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int gpio_pdrst;
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};
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#endif /* IIO_ADC_AD7780_H_ */
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