linux-kernel - RE: [PATCH 08/16] iio: adc: max1027: Explain better how the trigger state gets changed

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Date:   Fri, 20 Aug 2021 07:17:07 +0000
From:   "Sa, Nuno" <Nuno.Sa@...log.com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>
CC:     Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 08/16] iio: adc: max1027: Explain better how the trigger
 state gets changed



> -----Original Message-----
> From: Miquel Raynal <miquel.raynal@...tlin.com>
> Sent: Wednesday, August 18, 2021 1:12 PM
> To: Jonathan Cameron <jic23@...nel.org>; Lars-Peter Clausen
> <lars@...afoo.de>
> Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>; linux-
> iio@...r.kernel.org; linux-kernel@...r.kernel.org; Miquel Raynal
> <miquel.raynal@...tlin.com>
> Subject: [PATCH 08/16] iio: adc: max1027: Explain better how the
> trigger state gets changed
> 
> [External]
> 
> It may appear strange to configure the trigger to start upon register
> write while we want to disable the trigger. Explain why we do this in
> the comment.
> 
> Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
> ---
>  drivers/iio/adc/max1027.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
> index 59914fcfd320..4a78c9cbc339 100644
> --- a/drivers/iio/adc/max1027.c
> +++ b/drivers/iio/adc/max1027.c
> @@ -401,7 +401,12 @@ static int
> max1027_set_cnvst_trigger_state(struct iio_trigger *trig, bool state)
>  		if (ret < 0)
>  			return ret;
>  	} else {
> -		/* Start acquisition on conversion register write */
> +		/*
> +		 * Start acquisition on conversion register write, which
> +		 * basically disables triggering conversions upon cnvst
> changes
> +		 * and thus has the effect of disabling the external
> hardware
> +		 * trigger.
> +		 */
>  		ret = max1027_configure_trigger(indio_dev);
>  		if (ret)
>  			return ret;
> --
> 2.27.0

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