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

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Message-ID: <20150417195637.19585.24668@quantum>
Date:	Fri, 17 Apr 2015 12:56:37 -0700
From:	Michael Turquette <mturquette@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>,
	"Sebastian Hesselbarth" <sebastian.hesselbarth@...il.com>
Cc:	"Michael Welling" <mwelling@...e.org>,
	"Tero Kristo" <t-kristo@...com>,
	"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

Quoting Russell King - ARM Linux (2015-04-17 03:18:33)
> 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.

+1

And for ccf clock drivers Stephen and I plan to change the behavior of
clk_register() at some point so that it returns an error code and not a
struct clk. This will make clk_dev the only way to get at a struct clk
for users of the ccf implementation.

Of course it is still possible to clk_get from some place and pass as
platform_data, but every little bit helps.

Regards,
Mike

> 
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