iio: light: tsl2563: Drop legacy platform data code

There is no in-kernel user for legacy platform data.
Otherwise, a new one can use software nodes instead.
Hence, drop legacy platform data code.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Ferry Toth <ftoth@exalondelft.nl>
Link: https://lore.kernel.org/r/20221207190348.9347-7-andriy.shevchenko@linux.intel.comSigned-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/light/tsl2563.c

@@ -29,7 +29,6 @@
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 #include <linux/iio/events.h>
-#include <linux/platform_data/tsl2563.h>
 
 /* Use this many bits for fraction part. */
 #define ADC_FRAC_BITS		14
@@ -698,7 +697,6 @@ static int tsl2563_probe(struct i2c_client *client)
 	struct device *dev = &client->dev;
 	struct iio_dev *indio_dev;
 	struct tsl2563_chip *chip;
-	struct tsl2563_platform_data *pdata = client->dev.platform_data;
 	unsigned long irq_flags;
 	u8 id = 0;
 	int err;
@@ -730,14 +728,8 @@ static int tsl2563_probe(struct i2c_client *client)
 	chip->calib0 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
 	chip->calib1 = tsl2563_calib_from_sysfs(CALIB_BASE_SYSFS);
 
-	if (pdata) {
-		chip->cover_comp_gain = pdata->cover_comp_gain;
-	} else {
-		err = device_property_read_u32(&client->dev, "amstaos,cover-comp-gain",
-					       &chip->cover_comp_gain);
-		if (err)
-			chip->cover_comp_gain = 1;
-	}
+	chip->cover_comp_gain = 1;
+	device_property_read_u32(dev, "amstaos,cover-comp-gain", &chip->cover_comp_gain);
 
 	dev_info(&client->dev, "model %d, rev. %d\n", id >> 4, id & 0x0f);
 	indio_dev->name = client->name;

include/linux/platform_data/tsl2563.h

-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __LINUX_TSL2563_H
-#define __LINUX_TSL2563_H
-
-struct tsl2563_platform_data {
-	int cover_comp_gain;
-};
-
-#endif /* __LINUX_TSL2563_H */