Re: [PATCH net-next v8 2/9] i2c: designware: Add driver support for Wangxun 10Gb NIC

[Andy Shevchenko <andy.shevchenko@xxxxxxxxx>]

On Wed, May 17, 2023 at 12:26 PM Jiawen Wu <jiawenwu@xxxxxxxxxxxxxx> wrote:
> On Wednesday, May 17, 2023 4:49 PM, Jarkko Nikula wrote:
> > On 5/15/23 12:24, andy.shevchenko@xxxxxxxxx wrote:
> > > Mon, May 15, 2023 at 02:31:53PM +0800, Jiawen Wu kirjoitti:

...

> > >>    dev->flags = (uintptr_t)device_get_match_data(&pdev->dev);
> > >> +  if (device_property_present(&pdev->dev, "snps,i2c-platform"))
> > >> +          dev->flags |= MODEL_WANGXUN_SP;
> > >
> > > What I meant here is to use device_property_present() _iff_ you have decided to
> > > go with the _vendor-specific_ property name.
> > >
> > > Otherwise it should be handled differently, i.e. with reading the actual value
> > > of that property. Hence it should correspond the model enum, which you need to
> > > declare in the Device Tree bindings before use.
> > >
> > > So, either
> > >
> > >     if (device_property_present(&pdev->dev, "wx,..."))
> > >             dev->flags |= MODEL_WANGXUN_SP;
> > >
> > > or
> > >
> > >     if ((dev->flags & MODEL_MASK) == MODEL_NONE) {
> > >     // you now have to distinguish that there is no model set in driver data
> > >             u32 model;
> > >
> > >             ret = device_property_read_u32(dev, "snps,i2c-platform");
> > >             if (ret) {
> > >                     ...handle error...
> > >             }
> > >             dev->flags |= model
> > >
> > I'm not a device tree expert but I wonder would it be possible somehow
> > combine this and compatible properties in dw_i2c_of_match[]? They set
> > model flag for MODEL_MSCC_OCELOT and MODEL_BAIKAL_BT1.
>
> Maybe the table could be changed to match device property, instead of relying
> on DT only. Or device_get_match_data() could be also implemented in
> software node case?

This has been discussed [1] and still no visible prototype. Perhaps
you can collaborate with Vladimir on the matter.

[1]: https://lore.kernel.org/lkml/20230223203713.hcse3mkbq3m6sogb@skbuf/

-- 
With Best Regards,
Andy Shevchenko