staging: iio: ad2s1210: Drop the gpioin flag.

Drop gpioin flag which decides how the GPIOs
are controlled as the GPIOs must be outputs
for the host as per the datasheet.

Removes need for platform data so that is dropped as well.
Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/staging/iio/resolver/ad2s1210.c

@@ -20,7 +20,6 @@
 
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
-#include "ad2s1210.h"
 
 #define DRV_NAME "ad2s1210"
 
@@ -80,15 +79,7 @@ struct ad2s1210_gpio {
 	unsigned long flags;
 };
 
-static const struct ad2s1210_gpio gpios_in[] = {
-	[AD2S1210_SAMPLE] = { .name = "adi,sample", .flags = GPIOD_IN },
-	[AD2S1210_A0] = { .name = "adi,a0", .flags = GPIOD_IN },
-	[AD2S1210_A1] = { .name = "adi,a1", .flags = GPIOD_IN },
-	[AD2S1210_RES0] = { .name = "adi,res0", .flags = GPIOD_IN },
-	[AD2S1210_RES1] = { .name = "adi,res1", .flags = GPIOD_IN },
-};
-
-static const struct ad2s1210_gpio gpios_out[] = {
+static const struct ad2s1210_gpio gpios[] = {
 	[AD2S1210_SAMPLE] = { .name = "adi,sample", .flags = GPIOD_OUT_LOW },
 	[AD2S1210_A0] = { .name = "adi,a0", .flags = GPIOD_OUT_LOW },
 	[AD2S1210_A1] = { .name = "adi,a1", .flags = GPIOD_OUT_LOW },
@@ -99,7 +90,6 @@ static const struct ad2s1210_gpio gpios_out[] = {
 static const unsigned int ad2s1210_resolution_value[] = { 10, 12, 14, 16 };
 
 struct ad2s1210_state {
-	const struct ad2s1210_platform_data *pdata;
 	struct mutex lock;
 	struct spi_device *sdev;
 	struct gpio_desc *gpios[5];
@@ -180,14 +170,6 @@ int ad2s1210_update_frequency_control_word(struct ad2s1210_state *st)
 	return ad2s1210_config_write(st, fcw);
 }
 
-static unsigned char ad2s1210_read_resolution_pin(struct ad2s1210_state *st)
-{
-	int resolution = (gpiod_get_value(st->gpios[AD2S1210_RES0]) << 1) |
-			  gpiod_get_value(st->gpios[AD2S1210_RES1]);
-
-	return ad2s1210_resolution_value[resolution];
-}
-
 static const int ad2s1210_res_pins[4][2] = {
 	{ 0, 0 }, {0, 1}, {1, 0}, {1, 1}
 };
@@ -333,13 +315,7 @@ static ssize_t ad2s1210_store_control(struct device *dev,
 	}
 	st->resolution =
 		ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
-	if (st->pdata->gpioin) {
-		data = ad2s1210_read_resolution_pin(st);
-		if (data != st->resolution)
-			dev_warn(dev, "ad2s1210: resolution settings not match\n");
-	} else {
-		ad2s1210_set_resolution_pin(st);
-	}
+	ad2s1210_set_resolution_pin(st);
 	ret = len;
 	st->hysteresis = !!(data & AD2S1210_ENABLE_HYSTERESIS);
 
@@ -395,13 +371,7 @@ static ssize_t ad2s1210_store_resolution(struct device *dev,
 	}
 	st->resolution =
 		ad2s1210_resolution_value[data & AD2S1210_SET_RESOLUTION];
-	if (st->pdata->gpioin) {
-		data = ad2s1210_read_resolution_pin(st);
-		if (data != st->resolution)
-			dev_warn(dev, "ad2s1210: resolution settings not match\n");
-	} else {
-		ad2s1210_set_resolution_pin(st);
-	}
+	ad2s1210_set_resolution_pin(st);
 	ret = len;
 error_ret:
 	mutex_unlock(&st->lock);
@@ -622,10 +592,7 @@ static int ad2s1210_initial(struct ad2s1210_state *st)
 	int ret;
 
 	mutex_lock(&st->lock);
-	if (st->pdata->gpioin)
-		st->resolution = ad2s1210_read_resolution_pin(st);
-	else
-		ad2s1210_set_resolution_pin(st);
+	ad2s1210_set_resolution_pin(st);
 
 	ret = ad2s1210_config_write(st, AD2S1210_REG_CONTROL);
 	if (ret < 0)
@@ -660,19 +627,17 @@ static const struct iio_info ad2s1210_info = {
 
 static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
 {
-	const struct ad2s1210_gpio *pin = st->pdata->gpioin ?
-		&gpios_in[0] : &gpios_out[0];
 	struct spi_device *spi = st->sdev;
 	int i, ret;
 
-	for (i = 0; i < ARRAY_SIZE(gpios_in); i++) {
-		st->gpios[i] = devm_gpiod_get(&spi->dev, pin[i].name,
-					      pin[i].flags);
+	for (i = 0; i < ARRAY_SIZE(gpios); i++) {
+		st->gpios[i] = devm_gpiod_get(&spi->dev, gpios[i].name,
+					      gpios[i].flags);
 		if (IS_ERR(st->gpios[i])) {
 			ret = PTR_ERR(st->gpios[i]);
 			dev_err(&spi->dev,
 				"ad2s1210: failed to request %s GPIO: %d\n",
-				pin[i].name, ret);
+				gpios[i].name, ret);
 			return ret;
 		}
 	}
@@ -693,7 +658,6 @@ static int ad2s1210_probe(struct spi_device *spi)
 	if (!indio_dev)
 		return -ENOMEM;
 	st = iio_priv(indio_dev);
-	st->pdata = spi->dev.platform_data;
 	ret = ad2s1210_setup_gpios(st);
 	if (ret < 0)
 		return ret;

drivers/staging/iio/resolver/ad2s1210.h

-/*
- * ad2s1210.h plaform data for the ADI Resolver to Digital Converters:
- * AD2S1210
- *
- * Copyright (c) 2010-2010 Analog Devices Inc.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#ifndef _AD2S1210_H
-#define _AD2S1210_H
-
-struct ad2s1210_platform_data {
-	bool			gpioin;
-};
-#endif /* _AD2S1210_H */