Re: [PATCH v2 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC

[Andy Shevchenko <andy.shevchenko@xxxxxxxxx>]

On Mon, Apr 20, 2020 at 12:21 PM Boris Brezillon
<boris.brezillon@xxxxxxxxxxxxx> wrote:
> On Mon, 20 Apr 2020 01:20:40 +0300
> Andy Shevchenko <andriy.shevchenko@xxxxxxxxx> wrote:
> > On Sat, Apr 18, 2020 at 10:55:33AM +0200, Boris Brezillon wrote:
> > > On Fri, 17 Apr 2020 16:21:47 +0800
> > > "Ramuthevar,Vadivel MuruganX"
> > > <vadivel.muruganx.ramuthevar@xxxxxxxxxxxxxxx> wrote:
> > >
> > > > From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@xxxxxxxxxxxxxxx>
> >
> > > > +static const struct of_device_id lgm_nand_match[] = {
> > > > + { .compatible = "intel,lgm-nand", },
> > > > + {}
> > > > +};
> > > > +MODULE_DEVICE_TABLE(of, lgm_nand_match);
> > >
> > > You probably have a missing "depends on OF" in your Kconfig.
> >
> > Since it's using device property API, dependency is not needed.
> >
>
> There's no compile-time dependency, but this driver will be pretty
> useless if all its users have the NAND controller node defined in their
> DT and CONFIG_OF is not enabled.

No, it's not.
See [1] for the details how ACPI may utilize this table.

[1]: https://www.kernel.org/doc/html/latest/firmware-guide/acpi/enumeration.html#device-tree-namespace-link-device-id

> I guess the OF option is selected by
> arches, so explicitly depending on OF is only relevant if you change
> the dependency rules as suggested in my other reply.

-- 
With Best Regards,
Andy Shevchenko

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