linux-kernel - Re: [PATCH 2/2] clk: Generic support for fixed-rate clocks

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Date:	Mon, 13 Dec 2010 13:42:54 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Jeremy Kerr <jeremy.kerr@...onical.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] clk: Generic support for fixed-rate clocks

On Mon, Dec 13, 2010 at 08:35:37PM +0800, Jeremy Kerr wrote:
> Hi Sascha,
> 
> > > +extern struct clk_ops clk_fixed_ops;
> > > +
> > > +#define INIT_CLK_FIXED(name, r) { \
> > > +	.clk = INIT_CLK(name.clk, clk_fixed_ops), \
> > > +	.rate = (r) \
> > > +}
> > 
> > Is there any other valid usecase for this other than
> > 
> > struct clk_fixed bla = INIT_CLK_FIXED(bla, rate);
> > 
> > Otherwise I suggest to convert the macro to:
> > 
> > #define INIT_CLK_FIXED(name, r) \
> > 	struct clk_fixed name = { \
> > 		.clk = INIT_CLK(name.clk, clk_fixed_ops), \
> > 		.rate = (r) \
> > 	}
> > 
> > This way we do not have to specify the same name twice (and it has
> > to be exactly the same name, otherwise it won't compile).
> 
> For the system-wide INIT_CLK* macros, I've intentionally made them initalisers 
> rather than declarators, so that we can use them in other declarators (ie, the 
> usage of INIT_CLK() above). This would be relevant if someone is using 
> clk_fixed in their struct - probably not likely, but good to be consistent.
> 
> But yes, it would be good to avoid having to specify the name twice - how 
> about adding a:
> 
> #define DEFINE_CLK_FIXED(name, r) \
> 	struct clk_fixed name = INIT_CLK_FIXED(name, r)
> 
> - just like DEFINE_MUTEX and MUTEX_INITIALIZER.

Jup, sounds good.

Sascha

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