linux-kernel - Re: [alsa-devel] [PATCH v2] clkdev: add devm_of_clk

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Date:   Wed, 30 Nov 2016 01:08:20 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Stephen Boyd <sboyd@...eaurora.org>
CC:     Rob Herring <robh@...nel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Linux-DT <devicetree@...r.kernel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Russell King <linux@...linux.org.uk>,
        Linux-Kernel <linux-kernel@...r.kernel.org>,
        Mark Brown <broonie@...nel.org>, <linux-clk@...r.kernel.org>,
        Linux-ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [PATCH v2] clkdev: add devm_of_clk_get()


Hi Stephen

Thank you for your feedback.

> > > >  	sound_soc {
> > > > 		clocks = <&xxx>, <&xxx>;
> > > > 		clock-names = "cpu", "codec";
> > > >  		...
> > > >  		cpu {
> > > >  			...
> > > >  		};
> > > >  		codec {
> > > >  			...
> > > >  		};
> > > >  	};
(snip)
> The problem is that it encourages the use of of_clk_get() when
> clk_get() is more desirable. Ideally of_clk_get() is never used
> when a device exists. In this case, it seems like we need to
> support it though, hence the suggestion of having a
> devm_get_clk_from_child() API, that explicitly reads as "get a
> clock from a child node of this device". The distinction is
> important, because of_clk_get() should rarely be used.

I understand your point, but I think devm_get_clk_from_child()
needs new DT setings, and it can't keep compatibility, or
it makes driver complex.
I think it is nice to have. but, I want to keep current style.
Thus, I will try to use current of_clk_get() as-is, and
call clk_free() somehow in this driver.