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SubjectRe: [PATCH v2 13/14] Move ad7746 out of staging
On Sun, 15 Apr 2018 11:46:09 -0700
Joe Perches <joe@perches.com> wrote:

> On Sun, 2018-04-15 at 18:04 +0100, Jonathan Cameron wrote:
> > On Fri, 13 Apr 2018 13:36:50 -0300
> > Hernán Gonzalez <hernan@vanguardiasur.com.ar> wrote:
> >
> > > Signed-off-by: Hernán Gonzalez <hernan@vanguardiasur.com.ar>
> >
> > A few comments inline.
>
> And a trivial typo and other bits
>
> > > diff --git a/drivers/iio/cdc/Makefile b/drivers/iio/cdc/Makefile
> []
> > > @@ -0,0 +1,5 @@
> > > +#
> > > +#Makeefile for industrial I/O CDC drivers
>
> Makefile
>
> > > diff --git a/drivers/iio/cdc/ad7746.c b/drivers/iio/cdc/ad7746.c
> []
> > > @@ -0,0 +1,855 @@
>
> Perhaps use the SPDX tags
There was some resistance around this so we dropped it from suggested changes
before moving these drivers out of staging. Can sort it out later.

>
> > > +/*
> > > + * AD7746 capacitive sensor driver supporting AD7745, AD7746 and AD7747
> > > + *
> > > + * Copyright 2011 Analog Devices Inc.
> > > + *
> > > + * Licensed under the GPL-2.
> > > + */
>
> []
>
> > > +static const struct iio_chan_spec ad7746_channels[] = {
> > > + [VIN] = {
> > > + .type = IIO_VOLTAGE,
> > > + .indexed = 1,
> > > + .channel = 0,
> > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> > > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |
> > > + BIT(IIO_CHAN_INFO_SAMP_FREQ),
> > > + .address = AD7746_REG_VT_DATA_HIGH << 8 |
> > > + AD7746_VTSETUP_VTMD_EXT_VIN,
> >
> > Hmm. I never like to see a single location used to hold two different things.
> > I would suggest perhaps having address be an enum then have have a lookup
> > into an array of structures that have the two elements separately.
> > (use the ad7746_chan enum again for this?)
>
> And perhaps it's nicer to align the multiple
> BIT(identifier) uses like
>
> .info_mask_shared_by_type = (BIT(IIO_CHAN_INFO_SCALE) |
> BIT(IIO_CHAN_INFO_SAMP_FREQ)),
>
> The extra unnecessary parentheses allow at least emacs
> to align the BIT uses properly.
>
> []
>
> > > + [CIN1] = {
> > > + .type = IIO_CAPACITANCE,
> > > + .indexed = 1,
> > > + .channel = 0,
> > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> > > + BIT(IIO_CHAN_INFO_CALIBSCALE) | BIT(IIO_CHAN_INFO_OFFSET),
> > > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_CALIBBIAS) |
> > > + BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_SAMP_FREQ),
> > > + .address = AD7746_REG_CAP_DATA_HIGH << 8,
> > > + },
>
> So this one could be:
>
> .info_mask_shared_by_type = (BIT(IIO_CHAN_INFO_CALIBBIAS) |
> BIT(IIO_CHAN_INFO_SCALE) |
> BIT(IIO_CHAN_INFO_SAMP_FREQ)),
>
> etc...
>
>

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