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SubjectRe: [PATCH 2/2] clk: Generic support for fixed-rate clocks
On 02/21/2011 03:50 PM, 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@canonical.com>
>
> ---
> drivers/clk/clk.c | 14 ++++++++++++++
> include/linux/clk.h | 16 ++++++++++++++++
> 2 files changed, 30 insertions(+)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 0bc9c6f..0da0bb9 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -130,3 +130,17 @@ void __clk_put(struct clk *clk)
> if (clk->ops->put)
> clk->ops->put(clk);
> }
> +
> +/* clk_fixed support */
> +
> +#define to_clk_fixed(clk) (container_of(clk, struct clk_fixed, clk))
> +
> +static unsigned long clk_fixed_get_rate(struct clk *clk)
> +{
> + return to_clk_fixed(clk)->rate;
> +}
> +
> +struct clk_ops clk_fixed_ops = {
> + .get_rate = clk_fixed_get_rate,
> +};
> +EXPORT_SYMBOL_GPL(clk_fixed_ops);
> diff --git a/include/linux/clk.h b/include/linux/clk.h
> index 604be74..7c0808c 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -155,6 +155,22 @@ static inline void clk_common_init(struct clk *clk)
> mutex_init(&clk->prepare_lock);
> }
>
> +/* Simple fixed-rate clock */
> +struct clk_fixed {
> + struct clk clk;
> + unsigned long rate;

If we never need to dynamically create fixed clocks (which seems
unlikely) then rate can be const.

~Ryan

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