linux-kernel - Re: [PATCH v7 5/9] iio: adc: ad7173: refactor ain and vref selection

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Date: Mon, 10 Jun 2024 16:35:01 +0200
From: Nuno Sá <noname.nuno@...il.com>
To: dumitru.ceclan@...log.com
Cc: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich
 <Michael.Hennerich@...log.com>, Jonathan Cameron <jic23@...nel.org>, Rob
 Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>,
 David Lechner <dlechner@...libre.com>,  linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org,  linux-kernel@...r.kernel.org, Dumitru Ceclan
 <mitrutzceclan@...il.com>
Subject: Re: [PATCH v7 5/9] iio: adc: ad7173: refactor ain and vref selection

On Mon, 2024-06-10 at 09:23 +0200, Nuno Sá wrote:
> On Fri, 2024-06-07 at 17:53 +0300, Dumitru Ceclan via B4 Relay wrote:
> > From: Dumitru Ceclan <dumitru.ceclan@...log.com>
> > 
> > Move validation of analog inputs and reference voltage selection to
> > separate functions to reduce the size of the channel config parsing
> > function and improve readability.
> > Add defines for the number of analog inputs in a channel.
> > 
> > Signed-off-by: Dumitru Ceclan <dumitru.ceclan@...log.com>
> > ---
> 
> One minor nit that maybe can be tweaked while applying. Anyways, no need for
> v8
> just because of it:
> 
> Reviewed-by: Nuno Sa <nuno.sa@...log.com>
> 
> >  drivers/iio/adc/ad7173.c | 62 +++++++++++++++++++++++++++++++++------------
> > --
> > -
> >  1 file changed, 43 insertions(+), 19 deletions(-)
> > 
> > diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
> > index 8631f218b69e..1257303b0cf6 100644
> > --- a/drivers/iio/adc/ad7173.c
> > +++ b/drivers/iio/adc/ad7173.c
> > @@ -60,6 +60,7 @@
> >  #define AD7173_CH_SETUP_AINPOS_MASK	GENMASK(9, 5)
> >  #define AD7173_CH_SETUP_AINNEG_MASK	GENMASK(4, 0)
> >  
> > +#define AD7173_NO_AINS_PER_CHANNEL	2
> >  #define AD7173_CH_ADDRESS(pos, neg) \
> >  	(FIELD_PREP(AD7173_CH_SETUP_AINPOS_MASK, pos) | \
> >  	 FIELD_PREP(AD7173_CH_SETUP_AINNEG_MASK, neg))
> > @@ -906,13 +907,48 @@ static int ad7173_register_clk_provider(struct iio_dev
> > *indio_dev)
> >  					   &st->int_clk_hw);
> >  }
> >  
> > +static int ad7173_validate_voltage_ain_inputs(struct ad7173_state *st,
> > +					      unsigned int ain0, unsigned
> > int
> > ain1)
> > +{
> > +	struct device *dev = &st->sd.spi->dev;
> > +
> > +	if (ain0 >= st->info->num_inputs ||
> > +	    ain1 >= st->info->num_inputs)
> > +		return dev_err_probe(dev, -EINVAL,
> > +				     "Input pin number out of range for
> > pair
> > (%d %d).\n",
> > +				     ain0, ain1);
> > +
> > +	return 0;
> > +}
> > +
> > +static int ad7173_validate_reference(struct ad7173_state *st, int ref_sel)
> > +{
> > +	struct device *dev = &st->sd.spi->dev;
> > +	int ret;
> > +
> > +	if (ref_sel == AD7173_SETUP_REF_SEL_INT_REF && !st->info-
> > > has_int_ref)
> > +		return dev_err_probe(dev, -EINVAL,
> > +			"Internal reference is not available on current
> > model.\n");
> > +
> > +	if (ref_sel == AD7173_SETUP_REF_SEL_EXT_REF2 && !st->info-
> > >has_ref2)
> > +		return dev_err_probe(dev, -EINVAL,
> > +			"External reference 2 is not available on current
> > model.\n");
> > +
> > +	ret = ad7173_get_ref_voltage_milli(st, ref_sel);
> > +	if (ret < 0)
> > +		return dev_err_probe(dev, ret, "Cannot use reference %u\n",
> > +				     ref_sel);
> > +
> > +	return 0;
> 
> could be return ad7173_get_ref_voltage_milli()...
> 

Bahh, disregard my comment. We went over this in v6 :facepalm:

- Nuno Sá