iio: adc: ad7124: Use devm_ managed calls for all of probe() + drop remove()

As not many steps were not already devm_ managed, use
devm_add_action_or_reset() to handle the rest.

This also uses the new devm_ad_sd_setup_buffer_and_trigger() function.
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Alexandru Ardelean <aardelean@deviqon.com>
Link: https://lore.kernel.org/r/20210513120752.90074-12-aardelean@deviqon.com

drivers/iio/adc/ad7124.c

@@ -862,6 +862,11 @@ static void ad7124_reg_disable(void *r)
 	regulator_disable(r);
 }
 
+static void ad7124_clk_disable(void *c)
+{
+	clk_disable_unprepare(c);
+}
+
 static int ad7124_probe(struct spi_device *spi)
 {
 	const struct ad7124_chip_info *info;
@@ -883,8 +888,6 @@ static int ad7124_probe(struct spi_device *spi)
 
 	ad_sd_init(&st->sd, indio_dev, spi, &ad7124_sigma_delta_info);
 
-	spi_set_drvdata(spi, indio_dev);
-
 	indio_dev->name = st->chip_info->name;
 	indio_dev->modes = INDIO_DIRECT_MODE;
 	indio_dev->info = &ad7124_info;
@@ -922,48 +925,28 @@ static int ad7124_probe(struct spi_device *spi)
 	if (ret < 0)
 		return ret;
 
+	ret = devm_add_action_or_reset(&spi->dev, ad7124_clk_disable, st->mclk);
+	if (ret)
+		return ret;
+
 	ret = ad7124_soft_reset(st);
 	if (ret < 0)
-		goto error_clk_disable_unprepare;
+		return ret;
 
 	ret = ad7124_check_chip_id(st);
 	if (ret)
-		goto error_clk_disable_unprepare;
+		return ret;
 
 	ret = ad7124_setup(st);
 	if (ret < 0)
-		goto error_clk_disable_unprepare;
+		return ret;
 
-	ret = ad_sd_setup_buffer_and_trigger(indio_dev);
+	ret = devm_ad_sd_setup_buffer_and_trigger(&spi->dev, indio_dev);
 	if (ret < 0)
-		goto error_clk_disable_unprepare;
-
-	ret = iio_device_register(indio_dev);
-	if (ret < 0) {
-		dev_err(&spi->dev, "Failed to register iio device\n");
-		goto error_remove_trigger;
-	}
-
-	return 0;
-
-error_remove_trigger:
-	ad_sd_cleanup_buffer_and_trigger(indio_dev);
-error_clk_disable_unprepare:
-	clk_disable_unprepare(st->mclk);
-
 		return ret;
-}
 
-static int ad7124_remove(struct spi_device *spi)
-{
-	struct iio_dev *indio_dev = spi_get_drvdata(spi);
-	struct ad7124_state *st = iio_priv(indio_dev);
+	return devm_iio_device_register(&spi->dev, indio_dev);
 
-	iio_device_unregister(indio_dev);
-	ad_sd_cleanup_buffer_and_trigger(indio_dev);
-	clk_disable_unprepare(st->mclk);
-
-	return 0;
 }
 
 static const struct of_device_id ad7124_of_match[] = {
@@ -981,7 +964,6 @@ static struct spi_driver ad71124_driver = {
 		.of_match_table = ad7124_of_match,
 	},
 	.probe = ad7124_probe,
-	.remove	= ad7124_remove,
 };
 module_spi_driver(ad71124_driver);