iio: adc: dln2-adc: simplify timestamp channel definition

Use IIO_CHAN_SOFT_TIMESTAMP() to define the timestamp channel instead of
manually filling in the struct iio_chan_spec fields. This makes the code
less verbose and mistake-prone.

Signed-off-by: David Lechner <dlechner@baylibre.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

Author: dlech

drivers/iio/adc/dln2-adc.c

@@ -444,16 +444,6 @@ static int dln2_update_scan_mode(struct iio_dev *indio_dev,
 	lval.scan_type.endianness = IIO_LE;				\
 }
 
-/* Assignment version of IIO_CHAN_SOFT_TIMESTAMP */
-#define IIO_CHAN_SOFT_TIMESTAMP_ASSIGN(lval, _si) {	\
-	lval.type = IIO_TIMESTAMP;			\
-	lval.channel = -1;				\
-	lval.scan_index = _si;				\
-	lval.scan_type.sign = 's';			\
-	lval.scan_type.realbits = 64;			\
-	lval.scan_type.storagebits = 64;		\
-}
-
 static const struct iio_info dln2_adc_info = {
 	.read_raw = dln2_adc_read_raw,
 	.write_raw = dln2_adc_write_raw,
@@ -614,7 +604,7 @@ static int dln2_adc_probe(struct platform_device *pdev)
 
 	for (i = 0; i < chans; ++i)
 		DLN2_ADC_CHAN(dln2->iio_channels[i], i)
-	IIO_CHAN_SOFT_TIMESTAMP_ASSIGN(dln2->iio_channels[i], i);
+	dln2->iio_channels[i] = IIO_CHAN_SOFT_TIMESTAMP(i);
 
 	indio_dev->name = DLN2_ADC_MOD_NAME;
 	indio_dev->info = &dln2_adc_info;