iio: adc: ad7291: convert to device tree

There are no in-tree users of the platform data for this driver, so
remove it and convert the driver to use device tree instead.

Signed-off-by: Michael Auchter <michael.auchter@ni.com>
Link: https://lore.kernel.org/r/20200922144422.542669-1-michael.auchter@ni.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/adc/ad7291.c b/drivers/iio/adc/ad7291.c
index 62fde2a..2301a0e 100644 (file)
--- a/drivers/iio/adc/ad7291.c
+++ b/drivers/iio/adc/ad7291.c
@@ -20,8 +20,6 @@
 #include <linux/iio/sysfs.h>
 #include <linux/iio/events.h>
 
-#include <linux/platform_data/ad7291.h>
-
 /*
  * Simplified handling
  *
@@ -465,7 +463,6 @@ static const struct iio_info ad7291_info = {
 static int ad7291_probe(struct i2c_client *client,
                        const struct i2c_device_id *id)
 {
-       struct ad7291_platform_data *pdata = client->dev.platform_data;
        struct ad7291_chip_info *chip;
        struct iio_dev *indio_dev;
        int ret;
@@ -475,16 +472,6 @@ static int ad7291_probe(struct i2c_client *client,
                return -ENOMEM;
        chip = iio_priv(indio_dev);
 
-       if (pdata && pdata->use_external_ref) {
-               chip->reg = devm_regulator_get(&client->dev, "vref");
-               if (IS_ERR(chip->reg))
-                       return PTR_ERR(chip->reg);
-
-               ret = regulator_enable(chip->reg);
-               if (ret)
-                       return ret;
-       }
-
        mutex_init(&chip->state_lock);
        /* this is only used for device removal purposes */
        i2c_set_clientdata(client, indio_dev);
@@ -495,8 +482,21 @@ static int ad7291_probe(struct i2c_client *client,
                        AD7291_T_SENSE_MASK | /* Tsense always enabled */
                        AD7291_ALERT_POLARITY; /* set irq polarity low level */
 
-       if (pdata && pdata->use_external_ref)
+       chip->reg = devm_regulator_get_optional(&client->dev, "vref");
+       if (IS_ERR(chip->reg)) {
+               if (PTR_ERR(chip->reg) != -ENODEV)
+                       return PTR_ERR(chip->reg);
+
+               chip->reg = NULL;
+       }
+
+       if (chip->reg) {
+               ret = regulator_enable(chip->reg);
+               if (ret)
+                       return ret;
+
                chip->command |= AD7291_EXT_REF;
+       }
 
        indio_dev->name = id->name;
        indio_dev->channels = ad7291_channels;
@@ -567,9 +567,16 @@ static const struct i2c_device_id ad7291_id[] = {
 
 MODULE_DEVICE_TABLE(i2c, ad7291_id);
 
+static const struct of_device_id ad7291_of_match[] = {
+       { .compatible = "adi,ad7291" },
+       {}
+};
+MODULE_DEVICE_TABLE(of, ad7291_of_match);
+
 static struct i2c_driver ad7291_driver = {
        .driver = {
                .name = KBUILD_MODNAME,
+               .of_match_table = ad7291_of_match,
        },
        .probe = ad7291_probe,
        .remove = ad7291_remove,

diff --git a/include/linux/platform_data/ad7291.h b/include/linux/platform_data/ad7291.h
deleted file mode 100644 (file)
index b1fd153..0000000
--- a/include/linux/platform_data/ad7291.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __IIO_AD7291_H__
-#define __IIO_AD7291_H__
-
-/**
- * struct ad7291_platform_data - AD7291 platform data
- * @use_external_ref: Whether to use an external or internal reference voltage
- */
-struct ad7291_platform_data {
-       bool use_external_ref;
-};
-
-#endif