linux-kernel - Re: AM335x OMAP2 common clock external fixed-clock registration

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Message-ID: <20150417193952.GV4027@n2100.arm.linux.org.uk>
Date:	Fri, 17 Apr 2015 20:39:52 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Michael Welling <mwelling@...e.org>
Cc:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Tero Kristo <t-kristo@...com>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	devicetree <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Tony Lindgren <tony@...mide.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Daniel Mack <daniel@...que.org>
Subject: Re: AM335x OMAP2 common clock external fixed-clock registration

On Fri, Apr 17, 2015 at 02:06:23PM -0500, Michael Welling wrote:
> On Fri, Apr 17, 2015 at 11:18:33AM +0100, Russell King - ARM Linux wrote:
> > On Fri, Apr 17, 2015 at 11:12:03AM +0200, Sebastian Hesselbarth wrote:
> > > On 17.04.2015 04:00, Michael Welling wrote:
> > > >On Fri, Apr 17, 2015 at 01:23:50AM +0200, Sebastian Hesselbarth wrote:
> > > >>On 17.04.2015 00:09, Michael Welling wrote:
> > > >>>On Thu, Apr 16, 2015 at 10:37:19PM +0200, Sebastian Hesselbarth wrote:
> > > >>>>On 16.04.2015 18:17, Michael Welling wrote:
> > > [...]
> > > >>>What would be the proper error path?
> > > >>>What cleanup is required?
> > > >>
> > > >>A proper error path would be to release any claimed resource
> > > >>on any error. If you look at the code, the only resources that
> > > >>need to be released are the two clocks in question.
> > > >
> > > >So for every error return in the probe function and in the of si5351_dt_parse
> > > >it needs to clk_put first right?
> > > 
> > > Not quite. The driver should clk_put() every clock that it called a
> > > [of_]clk_get() for. The thing is that clocks can be passed by
> > > platform_data and we never claim them.
> > 
> > I've always said clocks (as in struct clk) should never be passed through
> > platform data.
> >
> 
> What is the alternative for systems that still use the old platform files?

clkdev, which has pre-existed DT.

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