linux-kernel - Re: [PATCH v2] iio: adc: stm32-dfsdm: adapt sampling rate to oversampling ratio

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Date:   Mon, 13 Jan 2020 22:02:08 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Olivier MOYSAN <olivier.moysan@...com>
Cc:     "knaack.h@....de" <knaack.h@....de>,
        "lars@...afoo.de" <lars@...afoo.de>,
        "pmeerw@...erw.net" <pmeerw@...erw.net>,
        "mcoquelin.stm32@...il.com" <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Fabrice GASNIER <fabrice.gasnier@...com>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        "linux-stm32@...md-mailman.stormreply.com" 
        <linux-stm32@...md-mailman.stormreply.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Benjamin GAIGNARD <benjamin.gaignard@...com>
Subject: Re: [PATCH v2] iio: adc: stm32-dfsdm: adapt sampling rate to
 oversampling ratio

On Fri, 10 Jan 2020 10:06:13 +0000
Olivier MOYSAN <olivier.moysan@...com> wrote:

> Hi Jonathan, all,
> 
> Kind reminder on this patch.
Thanks!

Applied to the togreg branch of iio.git and pushed out of testing
to give the build bots a brief period to poke at it.

Sorry again for the delay

Thanks,

Jonathan


> Regards
> Olivier
> 
> On 11/27/19 2:10 PM, Olivier Moysan wrote:
> > Update sampling rate when oversampling ratio is changed
> > through the IIO ABI.
> >
> > Signed-off-by: Olivier Moysan <olivier.moysan@...com>
> > ---
> > changes in version 2:
> > - correct title
> > ---
> >   drivers/iio/adc/stm32-dfsdm-adc.c | 32 ++++++++++++++++++-------------
> >   1 file changed, 19 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/iio/adc/stm32-dfsdm-adc.c b/drivers/iio/adc/stm32-dfsdm-adc.c
> > index 0339ecdd06bd..87a842507509 100644
> > --- a/drivers/iio/adc/stm32-dfsdm-adc.c
> > +++ b/drivers/iio/adc/stm32-dfsdm-adc.c
> > @@ -1221,14 +1221,32 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
> >   	unsigned int spi_freq;
> >   	int ret = -EINVAL;
> >   
> > +	switch (ch->src) {
> > +	case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL:
> > +		spi_freq = adc->dfsdm->spi_master_freq;
> > +		break;
> > +	case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING:
> > +	case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING:
> > +		spi_freq = adc->dfsdm->spi_master_freq / 2;
> > +		break;
> > +	default:
> > +		spi_freq = adc->spi_freq;
> > +	}
> > +
> >   	switch (mask) {
> >   	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> >   		ret = iio_device_claim_direct_mode(indio_dev);
> >   		if (ret)
> >   			return ret;
> > +
> >   		ret = stm32_dfsdm_compute_all_osrs(indio_dev, val);
> > -		if (!ret)
> > +		if (!ret) {
> > +			dev_dbg(&indio_dev->dev,
> > +				"Sampling rate changed from (%u) to (%u)\n",
> > +				adc->sample_freq, spi_freq / val);
> >   			adc->oversamp = val;
> > +			adc->sample_freq = spi_freq / val;
> > +		}
> >   		iio_device_release_direct_mode(indio_dev);
> >   		return ret;
> >   
> > @@ -1240,18 +1258,6 @@ static int stm32_dfsdm_write_raw(struct iio_dev *indio_dev,
> >   		if (ret)
> >   			return ret;
> >   
> > -		switch (ch->src) {
> > -		case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL:
> > -			spi_freq = adc->dfsdm->spi_master_freq;
> > -			break;
> > -		case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_FALLING:
> > -		case DFSDM_CHANNEL_SPI_CLOCK_INTERNAL_DIV2_RISING:
> > -			spi_freq = adc->dfsdm->spi_master_freq / 2;
> > -			break;
> > -		default:
> > -			spi_freq = adc->spi_freq;
> > -		}
> > -
> >   		ret = dfsdm_adc_set_samp_freq(indio_dev, val, spi_freq);
> >   		iio_device_release_direct_mode(indio_dev);
> >   		return ret;