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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Liam Beguin <liambeguin@gmail.com>
Cc: "Jonathan Cameron" <jic23@kernel.org>,
	"Lars-Peter Clausen" <lars@metafoo.de>,
	"Michael Hennerich" <Michael.Hennerich@analog.com>,
	"Charles-Antoine Couret" <charles-antoine.couret@essensium.com>,
	"Nuno Sá" <Nuno.Sa@analog.com>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	linux-iio <linux-iio@vger.kernel.org>,
	devicetree <devicetree@vger.kernel.org>,
	"Rob Herring" <robh+dt@kernel.org>
Subject: Re: [PATCH v5 3/5] iio: adc: ad7949: add support for internal vref
Date: Mon, 16 Aug 2021 11:07:00 +0300	[thread overview]
Message-ID: <CAHp75VeNJ1fuo5dVfhk+w9H+0angfJEDPUVHUKk=Kgc=zNP8Fw@mail.gmail.com> (raw)
In-Reply-To: <CDIOK6DFUNE0.2P8L2AL8MDAK1@shaak>

On Fri, Aug 13, 2021 at 11:51 PM Liam Beguin <liambeguin@gmail.com> wrote:
> On Mon Aug 9, 2021 at 3:42 PM EDT, Jonathan Cameron wrote:

...

> > > > > +       /* Read channel specific information form the devicetree */

from

> > > > > +       device_for_each_child_node(dev, child) {
> > > > > +               ret = fwnode_property_read_u32(child, "reg", &i);
> > > > > +               if (ret) {
> > > > > +                       dev_err(dev, "missing reg property in %pfw\n", child);
> > > > > +                       fwnode_handle_put(child);
> > > > > +                       return ret;
> > > > > +               }
> > > > > +
> > > > > +               ad7949_chan = &ad7949_adc->channels[i];
> > > > > +
> > > > > +               ret = fwnode_property_read_u32(child, "adi,internal-ref-microvolt", &tmp);
> > > > > +               if (ret < 0 && ret != -EINVAL) {
> > > > > +                       dev_err(dev, "invalid internal reference in %pfw\n", child);
> > > > > +                       fwnode_handle_put(child);
> > > > > +                       return ret;
> > > > > +               }

> After getting access to another setup to run more tests, I noticed
> that setting the reference per channel isn't really feasible.

Is it a hardware limitation?

-- 
With Best Regards,
Andy Shevchenko

  reply	other threads:[~2021-08-16  8:07 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-08  1:56 [PATCH v5 0/5] AD7949 Fixes Liam Beguin
2021-08-08  1:56 ` [PATCH v5 1/5] iio: adc: ad7949: define and use bitfield names Liam Beguin
2021-08-08 16:51   ` Joe Perches
2021-08-08 22:46     ` Liam Beguin
2021-08-09 20:03       ` Joe Perches
2021-08-08  1:56 ` [PATCH v5 2/5] iio: adc: ad7949: fix spi messages on non 14-bit controllers Liam Beguin
2021-08-08  1:56 ` [PATCH v5 3/5] iio: adc: ad7949: add support for internal vref Liam Beguin
2021-08-08 16:36   ` Jonathan Cameron
2021-08-08 22:43     ` Liam Beguin
2021-08-09 19:42       ` Jonathan Cameron
2021-08-13 20:51         ` Liam Beguin
2021-08-16  8:07           ` Andy Shevchenko [this message]
2021-08-10 12:15       ` Andy Shevchenko
2021-08-10 19:46         ` Liam Beguin
2021-08-10 19:55           ` Andy Shevchenko
2021-08-10 20:51             ` Liam Beguin
2021-08-08  1:56 ` [PATCH v5 4/5] dt-bindings: iio: adc: ad7949: add per channel reference Liam Beguin
2021-08-08  1:56 ` [PATCH v5 5/5] iio: adc: ad7949: use devm managed functions Liam Beguin

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