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

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Date:	Mon, 13 Dec 2010 13:14:13 +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

Hi Jeremy,

On Wed, Dec 08, 2010 at 10:08:14AM +0800, Jeremy Kerr wrote:
> Since most platforms will need a fixed-rate clock, add one. This will
> also serve as a basic example of an implementation of struct clk.
> 
> Signed-off-by: Jeremy Kerr <jeremy.kerr@...onical.com>
> 
> ---
>  include/linux/clk.h |   13 +++++++++++++
>  kernel/clk.c        |   14 ++++++++++++++
>  2 files changed, 27 insertions(+)
> 
> diff --git a/include/linux/clk.h b/include/linux/clk.h
> index e09e40e..ae7e4ed 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -158,6 +158,19 @@ static inline void clk_common_init(struct clk *clk)
>  		mutex_init(&clk->lock.mutex);
>  }
>  
> +/* Simple fixed-rate clock */
> +struct clk_fixed {
> +	struct clk	clk;
> +	unsigned long	rate;
> +};
> +
> +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).

Sascha

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