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

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Date:   Thu, 24 Nov 2016 01:45:53 +0000
From:   Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:     Stephen Boyd <sboyd@...eaurora.org>
CC:     Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Mark Brown <broonie@...nel.org>,
        Linux-ALSA <alsa-devel@...a-project.org>,
        Linux-DT <devicetree@...r.kernel.org>,
        Linux-Kernel <linux-kernel@...r.kernel.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

> 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. I will check above 2 ideas.

Best regards
---
Kuninori Morimoto