On Tue, 17 Nov 2020 09:52:53 +0200 Alexandru Ardelean <alexandru.ardel...@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.ardel...@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. 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); >
