iio: adc: cc10001_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/cc10001_adc.c

@@ -262,7 +262,7 @@ static const struct iio_info cc10001_adc_info = {
 static int cc10001_adc_channel_init(struct iio_dev *indio_dev,
 				    unsigned long channel_map)
 {
-	struct iio_chan_spec *chan_array, *timestamp;
+	struct iio_chan_spec *chan_array;
 	unsigned int bit, idx = 0;
 
 	indio_dev->num_channels = bitmap_weight(&channel_map,
@@ -289,13 +289,7 @@ static int cc10001_adc_channel_init(struct iio_dev *indio_dev,
 		idx++;
 	}
 
-	timestamp = &chan_array[idx];
-	timestamp->type = IIO_TIMESTAMP;
-	timestamp->channel = -1;
-	timestamp->scan_index = idx;
-	timestamp->scan_type.sign = 's';
-	timestamp->scan_type.realbits = 64;
-	timestamp->scan_type.storagebits = 64;
+	chan_array[idx] = IIO_CHAN_SOFT_TIMESTAMP(idx);
 
 	indio_dev->channels = chan_array;