linux-kernel - Re: [PATCH 1/4] iio: adc: mcp3422: fix scale read bug

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Message-ID: <20221112171010.7a511746@jic23-huawei>
Date:   Sat, 12 Nov 2022 17:10:10 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Mitja Spes <mitja@...av.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Angelo Compagnucci <angelo.compagnucci@...il.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] iio: adc: mcp3422: fix scale read bug

On Fri, 11 Nov 2022 12:26:53 +0100
Mitja Spes <mitja@...av.com> wrote:

> Scale was returned for currently active channel instead of the specified
> channel.
> 
> Signed-off-by: Mitja Spes <mitja@...av.com>
> Fixes: 07914c84ba30 ("iio: adc: Add driver for Microchip MCP3422/3/4 high resolution ADC")
Hi Mitja,

One trivial comment inline. I might tidy that up whilst applying if others are
otherwise happy with this patch.  If you do a v2 for some other reason please
get rid of that unrelated change.

Jonathan

> ---
>  drivers/iio/adc/mcp3422.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/mcp3422.c b/drivers/iio/adc/mcp3422.c
> index da353dcb1e9d..3d53de300c89 100644
> --- a/drivers/iio/adc/mcp3422.c
> +++ b/drivers/iio/adc/mcp3422.c
> @@ -164,8 +164,9 @@ static int mcp3422_read_raw(struct iio_dev *iio,
>  	struct mcp3422 *adc = iio_priv(iio);
>  	int err;
>  
> +	u8 req_channel = channel->channel;
>  	u8 sample_rate = MCP3422_SAMPLE_RATE(adc->config);
> -	u8 pga		 = MCP3422_PGA(adc->config);
> +	u8 pga		 = adc->pga[req_channel];
>  
>  	switch (mask) {
>  	case IIO_CHAN_INFO_RAW:
> @@ -175,7 +176,6 @@ static int mcp3422_read_raw(struct iio_dev *iio,
>  		return IIO_VAL_INT;
>  
>  	case IIO_CHAN_INFO_SCALE:
> -
Unrelated change.  No problem with cleaning this up but definitely not
in a fix patch!

>  		*val1 = 0;
>  		*val2 = mcp3422_scales[sample_rate][pga];
>  		return IIO_VAL_INT_PLUS_NANO;