linux-kernel - Re: [PATCH] of/platform: Allow secondary compatible match in of_dev

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Message-ID: <20160412163156.GQ5995@atomide.com>
Date:	Tue, 12 Apr 2016 09:31:57 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Rob Herring <robh+dt@...nel.org>
Cc:	Frank Rowand <frowand.list@...il.com>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-omap <linux-omap@...r.kernel.org>
Subject: Re: [PATCH] of/platform: Allow secondary compatible match in
 of_dev_lookup

* Rob Herring <robh+dt@...nel.org> [160412 08:57]:
> On Thu, Apr 7, 2016 at 11:58 AM, Tony Lindgren <tony@...mide.com> wrote:
> > * Rob Herring <robh+dt@...nel.org> [160406 21:53]:
> >> On Fri, Apr 1, 2016 at 4:40 PM, Tony Lindgren <tony@...mide.com> wrote:
> >> > * Tony Lindgren <tony@...mide.com> [160401 14:37]:
> >> >> We currently try to match of_dev_auxdata based on compatible,
> >> >> IO address, and device name. But in some cases we have multiple
> >> >> instances of drivers that can use the same auxdata.
> >> >>
> >> >> Let's add an additional secondary lookup for generic compatible
> >> >> match for auxdata if no device specific match is found. This does
> >> >> not change the existing matching, and still allows adding device
> >> >> specific auxdata.
> >> >>
> >> >> This simplifies things as specifying the IO address and device
> >> >> name is prone errors as it requires maintaining an in kernel
> >> >> database for each SoC.
> >> >
> >> > And here's what I can apply later on to get rid of some
> >> > ifdeffery.
> >> >
> >> > I'm also planning to move some of the legacy omap hwmod
> >> > functionality into proper device drivers, so can generic
> >> > pdata for that too.
> >>
> >> Why can't the platform data be moved into the driver given that it
> >> appears to be only SoC family specific? Auxdata was somewhat intended
> >> to be temporary. It appears there is already some per compatible match
> >> data for these OMAP parts in the driver.
> >
> > There are just too many dependencies to move legacy code into drivers
> > directly. Especially when moving the omap hwmod code into drivers,
> > we still to use hwmod callbacks at least for clockdomain configuration,
> > wake-up dependencies and clock autogating configuration.
> >
> > When we have Linux generic frameworks available for all this we no longer
> > need the auxdata. But meanwhile, removing the depenencies by using
> > auxdata already allows moving big chunks of the hwmod code into regular
> > device drivers.
> 
> Okay. In that case:
> 
> Acked-by: Rob Herring <robh@...nel.org>
> 
> Apply it when you have actual users depending on it.

OK thanks will do.

Regards,

Tony