linux-kernel - Re: [RFC,PATCH 3/7 v2] arm/versatile: use generic struct clk

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Message-Id: <201001251135.41611.jeremy.kerr@canonical.com>
Date:	Mon, 25 Jan 2010 11:35:41 +1100
From:	Jeremy Kerr <jeremy.kerr@...onical.com>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC,PATCH 3/7 v2] arm/versatile: use generic struct clk

Hi Russell,

> This doesn't make any sense.  What are you trying to do here?
> 
> The get/put operations go together as one logical set - that's why you
> get both if you're using clkdev, and why you're asked to implement both
> __clk_get() and __clk_put() in arch code to do whatever's necessary
> with the clock.

I'm assuming that clk_put will be specific to the implementation; fixed clocks 
probably won't need to do anything, but others may need a refcount, etc.

We don't have a struct clk to use clk_get on, so it remains a non-clock-
specific function.

We'll probably need the symmetry for some cases though, I think that a 
__clk_get(struct clk *) member of clk_operations would work for this, to be 
called by clk_get.

Cheers,

Jeremy
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