staging:iio:ad7780: Remove the ad7780_platform_data

The ad7780_platform_data contains just the reference voltage information.
Since the preferred way of specifying this information is using the Linux
regulator framework and the ad7780 platform_data is not used by other
users, it can be completely removed.

Signed-off-by: Dragos Bogdan <[e-mail]>
Acked-by: Lars-Peter Clausen <[e-mail]>
Signed-off-by: Jonathan Cameron <[e-mail]>

drivers/staging/iio/adc/ad7780.c

···
 #include <linux/iio/sysfs.h>
 #include <linux/iio/adc/ad_sigma_delta.h>
 
-#include "ad7780.h"
-
 #define AD7780_RDY	BIT(7)
 #define AD7780_FILTER	BIT(6)
 #define AD7780_ERR	BIT(5)
···
 
 static int ad7780_probe(struct spi_device *spi)
 {
-	struct ad7780_platform_data *pdata = spi->dev.platform_data;
 	struct ad7780_state *st;
 	struct iio_dev *indio_dev;
 	int ret, voltage_uv = 0;
···
 	st->chip_info =
 		&ad7780_chip_info_tbl[spi_get_device_id(spi)->driver_data];
 
-	if (pdata && pdata->vref_mv)
-		st->int_vref_mv = pdata->vref_mv;
-	else if (voltage_uv)
+	if (voltage_uv)
 		st->int_vref_mv = voltage_uv / 1000;
 	else
-		dev_warn(&spi->dev, "reference voltage unspecified\n");
+		dev_warn(&spi->dev, "Reference voltage unspecified\n");
 
 	spi_set_drvdata(spi, indio_dev);
 

drivers/staging/iio/adc/ad7780.h

···
-/*
- * AD7780/AD7781 SPI ADC driver
- *
- * Copyright 2011 Analog Devices Inc.
- *
- * Licensed under the GPL-2.
- */
-#ifndef IIO_ADC_AD7780_H_
-#define IIO_ADC_AD7780_H_
-
-/*
- * TODO: struct ad7780_platform_data needs to go into include/linux/iio
- */
-
-/* NOTE:
- * The AD7780 doesn't feature a dedicated SPI chip select, in addition it
- * features a dual use data out ready DOUT/RDY output.
- * In order to avoid contentions on the SPI bus, it's therefore necessary
- * to use spi bus locking combined with a dedicated GPIO to control the
- * power down reset signal of the AD7780.
- *
- * The DOUT/RDY output must also be wired to an interrupt capable GPIO.
- */
-
-struct ad7780_platform_data {
-	u16				vref_mv;
-};
-
-#endif /* IIO_ADC_AD7780_H_ */