linux-kernel - Re: [PATCH 5/5] iio: adc: ad4030: explain rearranging raw sample data

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Message-ID: <5ee9f7cebe54313dbb4054a7215a5220316bce9c.camel@gmail.com>
Date: Tue, 11 Mar 2025 09:30:32 +0000
From: Nuno Sá <noname.nuno@...il.com>
To: David Lechner <dlechner@...libre.com>, Lars-Peter Clausen
 <lars@...afoo.de>,  Michael Hennerich <Michael.Hennerich@...log.com>, Nuno
 Sá <nuno.sa@...log.com>, Esteban Blanc	
 <eblanc@...libre.com>, Jonathan Cameron <jic23@...nel.org>
Cc: linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] iio: adc: ad4030: explain rearranging raw sample
 data

On Mon, 2025-03-10 at 15:43 -0500, David Lechner wrote:
> Add a comment explaining why the raw sample data is rearranged in the
> in the ad4030_conversion() function. It is not so obvious from the code
> why this is done.
> 
> Signed-off-by: David Lechner <dlechner@...libre.com>
> ---

Reviewed-by: Nuno Sá <nuno.sa@...log.com>

(BTW, for some reason I started to send the tags without first checking the
complete series. So I could have just replied to the cover :facepalm:

- Nuno Sá

>  drivers/iio/adc/ad4030.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/iio/adc/ad4030.c b/drivers/iio/adc/ad4030.c
> index
> 54ad74b96c9f256a67848330f875379edc828b0b..636f9f33e66af73d102722b984dc1230e141
> 7d1e 100644
> --- a/drivers/iio/adc/ad4030.c
> +++ b/drivers/iio/adc/ad4030.c
> @@ -646,6 +646,12 @@ static int ad4030_conversion(struct iio_dev *indio_dev)
>  					   &st->rx_data.dual.diff[0],
>  					   &st->rx_data.dual.diff[1]);
>  
> +	/*
> +	 * If no common mode voltage channel is enabled, we can use the raw
> +	 * data as is. Otherwise, we need to rearrange the data a bit to
> match
> +	 * the natural alignment of the IIO buffer.
> +	 */
> +
>  	if (st->mode != AD4030_OUT_DATA_MD_16_DIFF_8_COM &&
>  	    st->mode != AD4030_OUT_DATA_MD_24_DIFF_8_COM)
>  		return 0;
>