add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/iio/adc/ad7291.c
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@@ -1,9 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * AD7291 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor
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  *
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  * Copyright 2010-2011 Analog Devices Inc.
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- *
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- * Licensed under the GPL-2 or later.
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  */
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 #include <linux/device.h>
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@@ -20,8 +19,6 @@
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 #include <linux/iio/iio.h>
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 #include <linux/iio/sysfs.h>
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 #include <linux/iio/events.h>
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-
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-#include <linux/platform_data/ad7291.h>
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 /*
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  * Simplified handling
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@@ -466,7 +463,6 @@
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 static int ad7291_probe(struct i2c_client *client,
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 			const struct i2c_device_id *id)
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 {
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-	struct ad7291_platform_data *pdata = client->dev.platform_data;
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 	struct ad7291_chip_info *chip;
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 	struct iio_dev *indio_dev;
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 	int ret;
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@@ -475,16 +471,6 @@
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 	if (!indio_dev)
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 		return -ENOMEM;
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 	chip = iio_priv(indio_dev);
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-
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-	if (pdata && pdata->use_external_ref) {
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-		chip->reg = devm_regulator_get(&client->dev, "vref");
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-		if (IS_ERR(chip->reg))
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-			return PTR_ERR(chip->reg);
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-
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-		ret = regulator_enable(chip->reg);
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-		if (ret)
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-			return ret;
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-	}
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 	mutex_init(&chip->state_lock);
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 	/* this is only used for device removal purposes */
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@@ -496,15 +482,26 @@
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 			AD7291_T_SENSE_MASK | /* Tsense always enabled */
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 			AD7291_ALERT_POLARITY; /* set irq polarity low level */
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-	if (pdata && pdata->use_external_ref)
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+	chip->reg = devm_regulator_get_optional(&client->dev, "vref");
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+	if (IS_ERR(chip->reg)) {
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+		if (PTR_ERR(chip->reg) != -ENODEV)
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+			return PTR_ERR(chip->reg);
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+
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+		chip->reg = NULL;
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+	}
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+
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+	if (chip->reg) {
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+		ret = regulator_enable(chip->reg);
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+		if (ret)
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+			return ret;
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+
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 		chip->command |= AD7291_EXT_REF;
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+	}
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 	indio_dev->name = id->name;
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 	indio_dev->channels = ad7291_channels;
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 	indio_dev->num_channels = ARRAY_SIZE(ad7291_channels);
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-	indio_dev->dev.parent = &client->dev;
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-	indio_dev->dev.of_node = client->dev.of_node;
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 	indio_dev->info = &ad7291_info;
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 	indio_dev->modes = INDIO_DIRECT_MODE;
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@@ -570,9 +567,16 @@
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 MODULE_DEVICE_TABLE(i2c, ad7291_id);
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+static const struct of_device_id ad7291_of_match[] = {
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+	{ .compatible = "adi,ad7291" },
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+	{}
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+};
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+MODULE_DEVICE_TABLE(of, ad7291_of_match);
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+
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 static struct i2c_driver ad7291_driver = {
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 	.driver = {
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 		.name = KBUILD_MODNAME,
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+		.of_match_table = ad7291_of_match,
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 	},
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 	.probe = ad7291_probe,
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 	.remove = ad7291_remove,