iio: chemical: scd4x: expose timestamp channel

Timestamps were already written to the buffer in
scd4x_trigger_handler(), this patch makes them available as a channel.

Signed-off-by: Fiona Klute <fiona.klute@gmx.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/chemical/scd4x.c b/drivers/iio/chemical/scd4x.c
index 8859f89fb2a942d940b1ba7adf202977df7b4ad6..bb0019bb02a178de79364c40308f02276cb24e4f 100644 (file)
--- a/drivers/iio/chemical/scd4x.c
+++ b/drivers/iio/chemical/scd4x.c
@@ -59,6 +59,8 @@ enum scd4x_channel_idx {
        SCD4X_CO2,
        SCD4X_TEMP,
        SCD4X_HR,
+       /* kernel timestamp, at the end of buffer */
+       SCD4X_TS,
 };
 
 struct scd4x_state {
@@ -615,6 +617,7 @@ static const struct iio_chan_spec scd4x_channels[] = {
                        .endianness = IIO_BE,
                },
        },
+       IIO_CHAN_SOFT_TIMESTAMP(SCD4X_TS),
 };
 
 static int scd4x_suspend(struct device *dev)