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

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Message-ID: <20251221180508.252bd6d9@jic23-huawei>
Date: Sun, 21 Dec 2025 18:05:08 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Fiona Klute <fiona.klute@....de>
Cc: Roan van Dijk <roan@...tonic.nl>, linux-iio@...r.kernel.org, David
 Lechner <dlechner@...libre.com>, Nuno Sá
 <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: chemical: scd4x: expose timestamp channel

On Thu, 18 Dec 2025 16:12:05 +0100
Fiona Klute <fiona.klute@....de> wrote:

> 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>
Applied to the togreg branch of iio.git. Initially pushed out as testing
to let 0-day have a brief look at it.

Thanks,

Jonathan

> ---
>  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)