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

[Lee Jones]

On Fri, 18 Sep 2020, Sakari Ailus wrote:

> 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.

What?  of_match_ptr() is designed to change depending on OF or !OF.

Are you confusing this with acpi_match_table()?

> > 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 .

Could you allude to the specific line you are referencing please?

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

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
Follow Linaro: Facebook | Twitter | Blog