linux-kernel - Re: [PATCH 1/5] Clocklib: add generic framework for managing clocks.

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Date:	Tue, 15 Apr 2008 02:47:43 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dmitry Baryshkov <dbaryshkov@...il.com>
Cc:	linux-kernel@...r.kernel.org,
	Haavard Skinnemoen <haavard.skinnemoen@...el.com>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Paul Mundt <lethal@...ux-sh.org>,
	pHilipp Zabel <philipp.zabel@...il.com>,
	Pavel Machek <pavel@....cz>, tony@...mide.com, paul@...an.com,
	David Brownell <david-b@...bell.net>
Subject: Re: [PATCH 1/5] Clocklib: add generic framework for managing
 clocks.

On Tue, 15 Apr 2008 13:34:51 +0400 Dmitry Baryshkov <dbaryshkov@...il.com> wrote:

> On Mon, Apr 14, 2008 at 11:13:30PM -0700, Andrew Morton wrote:
> > On Sun, 13 Apr 2008 18:43:12 +0400 Dmitry Baryshkov <dbaryshkov@...il.com> wrote:
> > 
> > > +#define FUNC_TO_CLK(func)	&(&(struct clk_function) func)->clk
> > 
> > scratched my head for a while, was unable to work out what this does.
> > It is unused, so I think it can be zapped?
> 
> It take clk_function and returns pointer to the contained struct clk.

Then why does it cast a clk_function to a clk_function?

The innermost `&' hurts my brain.

> I used it to be able to write things like:
> 
> static struct clk *clks[] = {
> 	        [TC6387XB_CLK_MMC] = FUNC_TO_CLK(MFD_CLK_FUNC(NULL, "MMCCLK",
> 					&tc6387xb_cells[TC6387XB_CELL_MMC])),
> };
> 

erm, if you say so.  Is this as simple and clear as we can possibly make it?
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