linux-kernel - [PATCH] iio: chemical: scd4x: expose timestamp channel

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Message-ID: <20251218151205.1301792-1-fiona.klute@gmx.de>
Date: Thu, 18 Dec 2025 16:12:05 +0100
From: Fiona Klute <fiona.klute@....de>
To: Roan van Dijk <roan@...tonic.nl>,
	linux-iio@...r.kernel.org
Cc: Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>,
	linux-kernel@...r.kernel.org,
	Fiona Klute <fiona.klute@....de>
Subject: [PATCH] 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@....de>
---
 drivers/iio/chemical/scd4x.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/iio/chemical/scd4x.c b/drivers/iio/chemical/scd4x.c
index 0fd839176e264..23a326fb62a7e 100644
--- 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_CPU,
 		},
 	},
+	IIO_CHAN_SOFT_TIMESTAMP(SCD4X_TS),
 };
 
 static int scd4x_suspend(struct device *dev)
-- 
2.51.0