linux-kernel - Re: [PATCH] iio: adc: ad7313: fix calibration channel

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Message-ID: <75b46712867097cbe7a4e7bf070730d5c524149f.camel@gmail.com>
Date: Wed, 09 Jul 2025 10:33:32 +0100
From: Nuno Sá <noname.nuno@...il.com>
To: David Lechner <dlechner@...libre.com>, Michael Hennerich
	 <Michael.Hennerich@...log.com>, Jonathan Cameron <jic23@...nel.org>, Nuno
 Sá
	 <nuno.sa@...log.com>, Andy Shevchenko <andy@...nel.org>, Guillaume Ranquet
	 <granquet@...libre.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
 linux-iio@...r.kernel.org, 	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: ad7313: fix calibration channel

On Tue, 2025-07-08 at 20:38 -0500, David Lechner wrote:
> Fix the channel index values passed to ad_sd_calibrate() in
> ad7173_calibrate_all().
> 
> ad7173_calibrate_all() expects these values to be that of the CHANNELx
> register assigned to the channel, not the datasheet INPUTx number of the
> channel. The incorrect values were causing register writes to fail for
> some channels because they set the WEN bit that must always be 0 for
> register access and set the R/W bit to read instead of write. For other
> channels, the channel number was just wrong because the CHANNELx
> registers are generally assigned in reverse order and so almost never
> match the INPUTx numbers.
> 
> Fixes: 031bdc8aee01 ("iio: adc: ad7173: add calibration support")
> Signed-off-by: David Lechner <dlechner@...libre.com>
> ---

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

>  drivers/iio/adc/ad7173.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
> index
> c41bc5b9ac597f57eea6a097cc3a118de7b42210..61749586670d4f0730ca423d6e4c0ee1bf19
> edfa 100644
> --- a/drivers/iio/adc/ad7173.c
> +++ b/drivers/iio/adc/ad7173.c
> @@ -392,13 +392,12 @@ static int ad7173_calibrate_all(struct ad7173_state *st,
> struct iio_dev *indio_d
>  		if (indio_dev->channels[i].type != IIO_VOLTAGE)
>  			continue;
>  
> -		ret = ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_INT_ZERO, st-
> >channels[i].ain);
> +		ret = ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_INT_ZERO, i);
>  		if (ret < 0)
>  			return ret;
>  
>  		if (st->info->has_internal_fs_calibration) {
> -			ret = ad_sd_calibrate(&st->sd,
> AD7173_MODE_CAL_INT_FULL,
> -					      st->channels[i].ain);
> +			ret = ad_sd_calibrate(&st->sd,
> AD7173_MODE_CAL_INT_FULL, i);
>  			if (ret < 0)
>  				return ret;
>  		}
> 
> ---
> base-commit: 2233378a8c606f7f6893d4c16aa6eb6fea027a52
> change-id: 20250708-iio-adc-ad7313-fix-calibration-channel-198ed65d9b0a
> 
> Best regards,