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Date: Sun, 2 Jun 2024 14:13:36 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: "Paller, Kim Seer" <KimSeer.Paller@...log.com>
Cc: Jonathan Cameron <Jonathan.Cameron@...wei.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, David Lechner
<dlechner@...libre.com>, Lars-Peter Clausen <lars@...afoo.de>, Liam
Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, Dimitri
Fedrau <dima.fedrau@...il.com>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Rob Herring <robh@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
"Hennerich, Michael" <Michael.Hennerich@...log.com>, Nuno Sá
<noname.nuno@...il.com>
Subject: Re: [PATCH v2 5/5] iio: dac: ltc2664: Add driver for LTC2664 and
LTC2672
On Tue, 28 May 2024 05:53:11 +0000
"Paller, Kim Seer" <KimSeer.Paller@...log.com> wrote:
> > -----Original Message-----
> > From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> > Sent: Friday, May 24, 2024 1:02 AM
> > To: Paller, Kim Seer <KimSeer.Paller@...log.com>
> > Cc: linux-kernel@...r.kernel.org; linux-iio@...r.kernel.org;
> > devicetree@...r.kernel.org; Jonathan Cameron <jic23@...nel.org>; David
> > Lechner <dlechner@...libre.com>; Lars-Peter Clausen <lars@...afoo.de>;
> > Liam Girdwood <lgirdwood@...il.com>; Mark Brown <broonie@...nel.org>;
> > Dimitri Fedrau <dima.fedrau@...il.com>; Krzysztof Kozlowski
> > <krzk+dt@...nel.org>; Rob Herring <robh@...nel.org>; Conor Dooley
> > <conor+dt@...nel.org>; Hennerich, Michael
> > <Michael.Hennerich@...log.com>; Nuno Sá <noname.nuno@...il.com>
> > Subject: Re: [PATCH v2 5/5] iio: dac: ltc2664: Add driver for LTC2664 and
> > LTC2672
> >
> > [External]
> >
> > On Thu, 23 May 2024 11:19:09 +0800
> > Kim Seer Paller <kimseer.paller@...log.com> wrote:
> >
> > > LTC2664 4 channel, 16 bit Voltage Output SoftSpan DAC
> > > LTC2672 5 channel, 16 bit Current Output Softspan DAC
> > >
> > > Co-developed-by: Michael Hennerich <michael.hennerich@...log.com>
> > > Signed-off-by: Michael Hennerich <michael.hennerich@...log.com>
> > > Signed-off-by: Kim Seer Paller <kimseer.paller@...log.com>
> > Hi Kim,
> >
> > A few minor things inline,
> >
> > Jonathan
> >
> > > diff --git a/drivers/iio/dac/ltc2664.c b/drivers/iio/dac/ltc2664.c
> > > new file mode 100644
> > > index 000000000000..488b841e6c66
> > > --- /dev/null
> > > +++ b/drivers/iio/dac/ltc2664.c
> > > @@ -0,0 +1,802 @@
> >
> >
> > > +static int ltc2664_set_span(const struct ltc2664_state *st, int min, int max,
> > > + int chan)
> > > +{
> > > + const struct ltc2664_chip_info *chip_info = st->chip_info;
> > > + const int (*span_helper)[2] = chip_info->span_helper;
> > > + int span, ret;
> > > +
> > > + st->iio_channels[chan].type = chip_info->measurement_type;
> > > +
> > > + for (span = 0; span < chip_info->num_span; span++) {
> > > + if (min == span_helper[span][0] && max ==
> > span_helper[span][1])
> > > + break;
> > > + }
> >
> > Sanity check for no match?
> >
> > > +
> > > + ret = regmap_write(st->regmap, LTC2664_CMD_SPAN_N(chan),
> > > + (chip_info->id == LTC2672) ? span + 1 : span);
> > > + if (ret)
> > > + return ret;
> > > +
> > > + return span;
> > > +}
> > > +
> > > +static int ltc2664_channel_config(struct ltc2664_state *st)
> > > +{
> > > + const struct ltc2664_chip_info *chip_info = st->chip_info;
> > > + struct device *dev = &st->spi->dev;
> > > + u32 reg, tmp[2], mspan;
> > > + int ret, span;
> > > +
> > > + mspan = LTC2664_MSPAN_SOFTSPAN;
> > > + ret = device_property_read_u32(dev, "adi,manual-span-operation-
> > config",
> > > + &mspan);
> > > + if (!ret) {
> > > + if (!chip_info->manual_span_support)
> > > + return dev_err_probe(dev, -EINVAL,
> > > + "adi,manual-span-operation-config not
> > supported\n");
> > > +
> > > + if (mspan > ARRAY_SIZE(ltc2664_mspan_lut))
> > > + return dev_err_probe(dev, -EINVAL,
> > > + "adi,manual-span-operation-config not in
> > range\n");
> > > + }
> > > +
> > > + st->rfsadj = 20000;
> > > + ret = device_property_read_u32(dev, "adi,rfsadj-ohms", &st->rfsadj);
> > > + if (!ret) {
> > > + if (!chip_info->rfsadj_support)
> > > + return dev_err_probe(dev, -EINVAL,
> > > + "adi,rfsadj-ohms not supported\n");
> > > +
> > > + if (st->rfsadj < 19000 || st->rfsadj > 41000)
> > > + return dev_err_probe(dev, -EINVAL,
> > > + "adi,rfsadj-ohms not in range\n");
> > > + }
> > > +
> > > + device_for_each_child_node_scoped(dev, child) {
> > > + struct ltc2664_chan *chan;
> > > +
> > > + ret = fwnode_property_read_u32(child, "reg", ®);
> > > + if (ret)
> > > + return dev_err_probe(dev, ret,
> > > + "Failed to get reg property\n");
> > > +
> > > + if (reg >= chip_info->num_channels)
> > > + return dev_err_probe(dev, -EINVAL,
> > > + "reg bigger than: %d\n",
> > > + chip_info->num_channels);
> > > +
> > > + chan = &st->channels[reg];
> > > +
> > > + if (fwnode_property_read_bool(child, "adi,toggle-mode")) {
> > > + chan->toggle_chan = true;
> > > + /* assume sw toggle ABI */
> > > + st->iio_channels[reg].ext_info =
> > ltc2664_toggle_sym_ext_info;
> >
> > chan->ext_info = ...
>
> Hi Jonathan,
>
> I noticed that the struct ltc2664_chan does not currently have an ext_info field.
> Based on your comment, I'm considering adding this field to the structure yet
> I'd like to understand how this would interact with the iio_chan_spec. I'd see this
> by adding 'st->iio_channels[reg].ext_info = chan->ext_info' after that. Is that right
> approach? I'd appreciate more details on how you picture this. Thanks
Ah. Was a misread on my part. I confused channels and iio_channels.
Ignore that comment.
Sorry for the waste of time!
Jonathan
>
> Kim
>
>
>
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