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

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Date:   Thu, 24 Nov 2016 04:57:43 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Stephen Boyd <sboyd@...eaurora.org>, 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, again

> > I've seen bindings that have the 'clocks' property at the top
> > level and the appropriate 'clock-names' property to relate the
> > clocks to a subnode.
> > 
> >  	sound_soc {
> > 		clocks = <&xxx>, <&xxx>;
> > 		clock-names = "cpu", "codec";
> >  		...
> >  		cpu {
> >  			...
> >  		};
> >  		codec {
> >  			...
> >  		};
> >  	};
> > 
> > Then the subnodes call clk_get() with the top level device and
> > the name of their node and things match up. I suppose this
> > binding is finalized though, so we can't really do that?
> > 
> > I see that the gpio framework has a similar design called
> > devm_get_gpiod_from_child(), so how about we add a
> > devm_get_clk_from_child() API? That would more closely match the
> > intent here, which is to restrict the clk_get() operation to
> > child nodes of the device passed as the first argument.
> > 
> > struct clk *devm_get_clk_from_child(struct device *dev,
> > 				    const char *con_id,
> > 				    struct device_node *child);

Thanks, but, my point is that Linux already have "of_clk_get()",
but we don't have its devm_ version.
The point is that of_clk_get() can get clock from "device_node".
Why having devm_ version become so problem ?

Best regards
---
Kuninori Morimoto