[PATCH v4 3/6] iio: dac: ad5504: remove legacy platform data support

[Taha Ed-Dafili <0rayn.dev@gmail.com>]

The AD5504 driver contains fallback logic to use legacy pdata for
configuration. Since modern systems configure hardware exclusively
using device tree or ACPI, and there are no in tree users for it.
It can be safely removed.

Drop the ad5504_platform_data structure, remove the fallback logic
from the probe function, and delete the dedicated
include/linux/iio/dac/ad5504.h header file.

Signed-off-by: Taha Ed-Dafili <0rayn.dev@gmail.com>
---
 drivers/iio/dac/ad5504.c       | 14 +++-----------
 include/linux/iio/dac/ad5504.h | 15 ---------------
 2 files changed, 3 insertions(+), 26 deletions(-)
 delete mode 100644 include/linux/iio/dac/ad5504.h

diff --git a/drivers/iio/dac/ad5504.c b/drivers/iio/dac/ad5504.c
index 689147cdaa14..55ce7e49e0e0 100644
--- a/drivers/iio/dac/ad5504.c
+++ b/drivers/iio/dac/ad5504.c
@@ -18,7 +18,6 @@
 #include <linux/sysfs.h>
 #include <linux/types.h>
 
-#include <linux/iio/dac/ad5504.h>
 #include <linux/iio/events.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
@@ -275,7 +274,6 @@ static const struct iio_chan_spec ad5504_channels[] = {
 static int ad5504_probe(struct spi_device *spi)
 {
 	struct device *dev = &spi->dev;
-	const struct ad5504_platform_data *pdata = dev_get_platdata(dev);
 	struct iio_dev *indio_dev;
 	struct ad5504_state *st;
 	int ret;
@@ -287,16 +285,10 @@ static int ad5504_probe(struct spi_device *spi)
 	st = iio_priv(indio_dev);
 
 	ret = devm_regulator_get_enable_read_voltage(dev, "vcc");
-	if (ret < 0 && ret != -ENODEV)
+	if (ret < 0)
 		return ret;
-	if (ret == -ENODEV) {
-		if (pdata->vref_mv)
-			st->vref_mv = pdata->vref_mv;
-		else
-			dev_warn(dev, "reference voltage unspecified\n");
-	} else {
-		st->vref_mv = ret / 1000;
-	}
+
+	st->vref_mv = ret / 1000;
 
 	st->spi = spi;
 	indio_dev->name = spi_get_device_id(st->spi)->name;
diff --git a/include/linux/iio/dac/ad5504.h b/include/linux/iio/dac/ad5504.h
deleted file mode 100644
index 9f23c90486ee..000000000000
--- a/include/linux/iio/dac/ad5504.h
+++ /dev/null
@@ -1,15 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * AD5504 SPI DAC driver
- *
- * Copyright 2011 Analog Devices Inc.
- */
-
-#ifndef SPI_AD5504_H_
-#define SPI_AD5504_H_
-
-struct ad5504_platform_data {
-	u16				vref_mv;
-};
-
-#endif /* SPI_AD5504_H_ */
-- 
2.55.0