On Sat, Oct 27, 2018 at 05:49:03PM +0200, Slawomir Stepien wrote:
> Hi
>
> On paź 26, 2018 18:55, Nishad Kamdar wrote:
> > Add device tree table for matching vendor ID
> > and support for retrieving platform data
> > from device tree.
>
> So maybe you should make 2 commits?
>
Ok. I'll do that.
> > Signed-off-by: Nishad Kamdar <nishadkamdar@xxxxxxxxx>
> > ---
> > drivers/staging/iio/resolver/ad2s1210.c | 43 ++++++++++++++++++++++++-
> > 1 file changed, 42 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/staging/iio/resolver/ad2s1210.c b/drivers/staging/iio/resolver/ad2s1210.c
> > index 93c3c70ce62e..9fd5461c4ed0 100644
> > --- a/drivers/staging/iio/resolver/ad2s1210.c
> > +++ b/drivers/staging/iio/resolver/ad2s1210.c
> > @@ -17,6 +17,7 @@
> > #include <linux/delay.h>
> > #include <linux/gpio/consumer.h>
> > #include <linux/module.h>
> > +#include <linux/of.h>
> >
> > #include <linux/iio/iio.h>
> > #include <linux/iio/sysfs.h>
> > @@ -669,6 +670,27 @@ static int ad2s1210_setup_gpios(struct ad2s1210_state *st)
> > return 0;
> > }
> >
> > +#ifdef CONFIG_OF
> > +static struct ad2s1210_platform_data *ad2s1210_parse_dt(struct device *dev)
> > +{
> > + struct device_node *np = dev->of_node;
> > + struct ad2s1210_platform_data *pdata;
> > +
> > + pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
> > + if (!pdata)
> > + return NULL;
> > +
> > + pdata->gpioin = of_property_read_bool(np, "adi,gpioin");
>
> Why here you are adding "adi", but you are not adding it to the gpios in prev
> commit?
>
> I've also seen this: https://patchwork.kernel.org/patch/10355839/. However I do
> not understand why adding vendor id to props is needed...
>
> > +
> > + return pdata;
> > +}
> > +#else
> > +static struct ad2s1210_platform_data *ad2s1210_parse_dt(struct device *dev)
> > +{
> > + return NULL;
> > +}
> > +#endif
> > +
> > static int ad2s1210_probe(struct spi_device *spi)
> > {
> > struct iio_dev *indio_dev;
> > @@ -682,7 +704,19 @@ static int ad2s1210_probe(struct spi_device *spi)
> > if (!indio_dev)
> > return -ENOMEM;
> > st = iio_priv(indio_dev);
> > - st->pdata = spi->dev.platform_data;
> > + if (spi->dev.of_node) {
> > + st->pdata = ad2s1210_parse_dt(&spi->dev);
> > + if (!st->pdata)
> > + return -EINVAL;
> > + } else {
> > + st->pdata = spi->dev.platform_data;
> > + }
> > +
> > + if (!st->pdata) {
> > + dev_err(&spi->dev, "ad2s1210: no platform data supplied\n");
> > + return -EINVAL;
> > + }
> > +
>
> Why not just use only device-tree here? The ad2s1210_platform_data has now only
> one entry... In that case remember to add "depends on OF" in Kconfig.
>
Ok. I'll do that.
> > ret = ad2s1210_setup_gpios(st);
> > if (ret < 0)
> > return ret;
> > @@ -724,6 +758,12 @@ static int ad2s1210_remove(struct spi_device *spi)
> > return 0;
> > }
> >
> > +static const struct of_device_id ad2s1210_of_match[] = {
> > + { .compatible = "adi,ad2s1210", },
> > + { }
> > +};
> > +MODULE_DEVICE_TABLE(of, ad2s1210_of_match);
> > +
> > static const struct spi_device_id ad2s1210_id[] = {
> > { "ad2s1210" },
> > {}
> > @@ -733,6 +773,7 @@ MODULE_DEVICE_TABLE(spi, ad2s1210_id);
> > static struct spi_driver ad2s1210_driver = {
> > .driver = {
> > .name = DRV_NAME,
> > + .of_match_table = of_match_ptr(ad2s1210_of_match),
> > },
> > .probe = ad2s1210_probe,
> > .remove = ad2s1210_remove,
>
> --
> Slawomir Stepien
Thanks for the review.
Regards,
Nishad
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