From: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
To: Alexandru Ardelean <ardeleanalex@gmail.com>
Cc: Alexandru Ardelean <alexandru.ardelean@analog.com>,
linux-iio <linux-iio@vger.kernel.org>,
<devicetree@vger.kernel.org>, LKML <linux-kernel@vger.kernel.org>,
Jonathan Cameron <jic23@kernel.org>,
"Rob Herring" <robh+dt@kernel.org>,
Vaishnav M A <vaishnav@beagleboard.org>,
"Andy Shevchenko" <andy.shevchenko@gmail.com>
Subject: Re: [PATCH 2/3] iio: adc: ad7887: convert driver to full DT probing
Date: Tue, 17 Nov 2020 16:02:18 +0000 [thread overview]
Message-ID: <20201117160218.0000274b@Huawei.com> (raw)
In-Reply-To: <CA+U=DsoXG3JderYJL8_7Vu+UYZf9jiW-tW4pRiRY3a0p-y2peg@mail.gmail.com>
On Tue, 17 Nov 2020 17:03:06 +0200
Alexandru Ardelean <ardeleanalex@gmail.com> wrote:
> On Tue, Nov 17, 2020 at 1:06 PM Jonathan Cameron
> <Jonathan.Cameron@huawei.com> wrote:
> >
> > On Tue, 17 Nov 2020 11:01:11 +0000
> > Jonathan Cameron <Jonathan.Cameron@Huawei.com> wrote:
> >
> > > On Tue, 17 Nov 2020 09:52:53 +0200
> > > Alexandru Ardelean <alexandru.ardelean@analog.com> wrote:
> > >
> > > > This change removes the SPI device table, adds an OF device table instead.
> > > > This should also be usable for ACPI via PRP0001.
> > > >
> > > > This device is usually probed via device-tree, so it makes more sense to
> > > > use the OF device table.
> > > >
> > > > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> > > So, we've had a few cases of having to put the device_id table
> > > back again recently.
> > > https://lore.kernel.org/linux-iio/20201101152613.2c37581a@archlinux/
> > >
> > > They tend to be due to greybus doing it's probing in yet another fashion.
> > > So far they've been all i2c devices, but I kind of assume it does the same for spi.
> > > https://elixir.bootlin.com/linux/latest/source/drivers/staging/greybus/spilib.c#L437
> > >
> > > How device_get_match_data() plays with that I'm not sure. It probably
> > > doesn't right now given swnode doesn't have a device_get_match_data() callback.
> > >
> > > https://elixir.bootlin.com/linux/latest/source/drivers/base/swnode.c#L539
> > >
> > > So after all that I think I've argued myself around to thinking what you have
> > > here is fine. If someone wants to support this via a swnode then they can
> > > figure out how to make that work.
> > >
> > > +CC Vaishnav and Andy for their input.
> > >
> > > Otherwise looks fine to me.
> >
> > Having said that.... Why are we going through this dance for driver with
> > only one compatible? Are there other parts on their way?
> > If not, perhaps we should just rip out the matching code entirely in
> > the interests of simplicity.
>
> So, this one has a bit of a funny story.
> There's an AD7888 which is similar in terms of registers but with more channels.
> Lars did a patch to support it on top of AD7887:
> https://github.com/analogdevicesinc/linux/commits/iio-ad7888
>
> We tried to order a part for this to test the changes, but we got a
> reply that it's obsolete.
> The website says it is still in production.
> So, I was confused about the answer we got. ¯\_(ツ)_/¯
>
> In the meantime, I thought I'd take some of the cleanup value of Lars'
> work and do the cleanup only.
> We may still find that part somewhere and maybe add it, or maybe
> another one would come along.
> I don't know at this point. I'm mostly looking at some of my backlog
> stuff and trying to cleanup old stuff.
>
> I'm fine to simplify the driver now and add the matching bits later.
Sounds good to me.
>
> >
> > Jonathan
> >
> > >
> > > Thanks,
> > >
> > > Jonathan
> > >
> > >
> > > > ---
> > > > drivers/iio/adc/ad7887.c | 23 +++++++++++++++--------
> > > > 1 file changed, 15 insertions(+), 8 deletions(-)
> > > >
> > > > diff --git a/drivers/iio/adc/ad7887.c b/drivers/iio/adc/ad7887.c
> > > > index 06f684c053a0..4f68a1b17ec8 100644
> > > > --- a/drivers/iio/adc/ad7887.c
> > > > +++ b/drivers/iio/adc/ad7887.c
> > > > @@ -40,6 +40,7 @@ enum ad7887_channels {
> > > >
> > > > /**
> > > > * struct ad7887_chip_info - chip specifc information
> > > > + * @name: the name of the part
> > > > * @int_vref_mv: the internal reference voltage
> > > > * @channels: channels specification
> > > > * @num_channels: number of channels
> > > > @@ -47,6 +48,7 @@ enum ad7887_channels {
> > > > * @num_dual_channels: number of channels in dual mode
> > > > */
> > > > struct ad7887_chip_info {
> > > > + const char *name;
> > > > u16 int_vref_mv;
> > > > const struct iio_chan_spec *channels;
> > > > unsigned int num_channels;
> > > > @@ -218,6 +220,7 @@ static const struct ad7887_chip_info ad7887_chip_info_tbl[] = {
> > > > * More devices added in future
> > > > */
> > > > [ID_AD7887] = {
> > > > + .name = "ad7887",
> > > > .channels = ad7887_channels,
> > > > .num_channels = ARRAY_SIZE(ad7887_channels),
> > > > .dual_channels = ad7887_dual_channels,
> > > > @@ -239,12 +242,17 @@ static void ad7887_reg_disable(void *data)
> > > >
> > > > static int ad7887_probe(struct spi_device *spi)
> > > > {
> > > > + const struct ad7887_chip_info *info;
> > > > struct ad7887_state *st;
> > > > struct iio_dev *indio_dev;
> > > > bool dual_mode;
> > > > uint8_t mode;
> > > > int ret;
> > > >
> > > > + info = device_get_match_data(&spi->dev);
> > > > + if (!info)
> > > > + return -ENODEV;
> > > > +
> > > > indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> > > > if (indio_dev == NULL)
> > > > return -ENOMEM;
> > > > @@ -269,13 +277,12 @@ static int ad7887_probe(struct spi_device *spi)
> > > > return ret;
> > > > }
> > > >
> > > > - st->chip_info =
> > > > - &ad7887_chip_info_tbl[spi_get_device_id(spi)->driver_data];
> > > > + st->chip_info = info;
> > > >
> > > > spi_set_drvdata(spi, indio_dev);
> > > > st->spi = spi;
> > > >
> > > > - indio_dev->name = spi_get_device_id(spi)->name;
> > > > + indio_dev->name = st->chip_info->name;
> > > > indio_dev->info = &ad7887_info;
> > > > indio_dev->modes = INDIO_DIRECT_MODE;
> > > >
> > > > @@ -336,18 +343,18 @@ static int ad7887_probe(struct spi_device *spi)
> > > > return devm_iio_device_register(&spi->dev, indio_dev);
> > > > }
> > > >
> > > > -static const struct spi_device_id ad7887_id[] = {
> > > > - {"ad7887", ID_AD7887},
> > > > - {}
> > > > +static const struct of_device_id ad7887_of_match[] = {
> > > > + { .compatible = "adi,ad7887", .data = &ad7887_chip_info_tbl[ID_AD7887] },
> > > > + { }
> > > > };
> > > > -MODULE_DEVICE_TABLE(spi, ad7887_id);
> > > > +MODULE_DEVICE_TABLE(of, ad7887_of_match);
> > > >
> > > > static struct spi_driver ad7887_driver = {
> > > > .driver = {
> > > > .name = "ad7887",
> > > > + .of_match_table = ad7887_of_match,
> > > > },
> > > > .probe = ad7887_probe,
> > > > - .id_table = ad7887_id,
> > > > };
> > > > module_spi_driver(ad7887_driver);
> > > >
> > >
> >
next prev parent reply other threads:[~2020-11-17 16:02 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-17 7:52 [PATCH 1/3] iio: adc: ad7887: convert dual-channel mode to DT/ACPI Alexandru Ardelean
2020-11-17 7:52 ` [PATCH 2/3] iio: adc: ad7887: convert driver to full DT probing Alexandru Ardelean
2020-11-17 11:01 ` Jonathan Cameron
2020-11-17 11:04 ` Jonathan Cameron
2020-11-17 15:03 ` Alexandru Ardelean
2020-11-17 16:02 ` Jonathan Cameron [this message]
2020-11-18 12:59 ` Alexandru Ardelean
2020-11-18 16:06 ` Jonathan Cameron
2020-11-17 11:05 ` Andy Shevchenko
2020-11-17 7:52 ` [PATCH 3/3] dt-bindings: adc: ad7887: add binding doc for AD7887 Alexandru Ardelean
2020-11-17 11:03 ` Jonathan Cameron
2020-11-17 10:41 ` [PATCH 1/3] iio: adc: ad7887: convert dual-channel mode to DT/ACPI Jonathan Cameron
2020-11-17 11:08 ` Andy Shevchenko
2020-11-18 12:52 ` Alexandru Ardelean
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