linux-kernel - Re: [PATCH 2/2] iio: ad7793: Fix the serial interface reset

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Date:   Sun, 10 Sep 2017 16:25:10 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Lars-Peter Clausen <lars@...afoo.de>
Cc:     Dragos Bogdan <dragos.bogdan@...log.com>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] iio: ad7793: Fix the serial interface reset

On Tue, 5 Sep 2017 14:17:21 +0200
Lars-Peter Clausen <lars@...afoo.de> wrote:

> On 09/05/2017 02:16 PM, Dragos Bogdan wrote:
> > The serial interface can be reset by writing 32 consecutive 1s to the device.
> > 'ret' was initialized correctly but its value was overwritten when
> > ad7793_check_platform_data() was called. Since a dedicated reset function
> > is present now, it should be used instead.
> > 
> > Fixes: 2edb769d246e ("iio:ad7793: Add support for the ad7798 and ad7799")
> > Signed-off-by: Dragos Bogdan <dragos.bogdan@...log.com>  
> 
> Acked-by: Lars-Peter Clausen <lars@...afoo.de>

Applied to the fixes-togreg branch of iio.git and marked
for stable.

Thanks

Jonathan
> 
> > ---
> >  drivers/iio/adc/ad7793.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c
> > index e6706a09e100..47c3d7f32900 100644
> > --- a/drivers/iio/adc/ad7793.c
> > +++ b/drivers/iio/adc/ad7793.c
> > @@ -257,7 +257,7 @@ static int ad7793_setup(struct iio_dev *indio_dev,
> >  	unsigned int vref_mv)
> >  {
> >  	struct ad7793_state *st = iio_priv(indio_dev);
> > -	int i, ret = -1;
> > +	int i, ret;
> >  	unsigned long long scale_uv;
> >  	u32 id;
> >  
> > @@ -266,7 +266,7 @@ static int ad7793_setup(struct iio_dev *indio_dev,
> >  		return ret;
> >  
> >  	/* reset the serial interface */
> > -	ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
> > +	ret = ad_sd_reset(&st->sd, 32);
> >  	if (ret < 0)
> >  		goto out;
> >  	usleep_range(500, 2000); /* Wait for at least 500us */
> >   
> 
> --
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