Re: [PATCH leds v2 05/50] leds: various: guard of_match_table member value with of_match_ptr

[Sakari Ailus]

On Fri, Sep 18, 2020 at 11:20:58AM +0200, Marek Behun wrote:
> On Fri, 18 Sep 2020 09:15:00 +0300
> Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> wrote:
> 
> > Hi Marek,
> > 
> > On Fri, Sep 18, 2020 at 12:32:53AM +0200, Marek Behún wrote:
> > > Change
> > >   .of_match_table = xxx,
> > > to
> > >   .of_match_table = of_match_ptr(xxx),
> > > in various drivers.
> > > 
> > > This should be standard even for drivers that depend on OF.  
> > 
> > After this patch, none of these drivers will work on ACPI systems anymore.

^

If CONFIG_OF is disabled, that is.

> 
> Hi Sakari,
> 
> I don't understand. Why not? Does ACPI subsystem parse of_match_table
> as well?

It does. The compatible string is used the same way as in DT for matching
devices with "PRP0001" _HID or _CID.

Please read Documentation/firmware-guide/acpi/enumeration.rst .

IOW, you can safely do the above only for drivers that depend on OF in
Kconfig. Otherwise you'll probably break something.

-- 
Sakari Ailus