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SubjectRe: [RFC v2 1/1] clk: Add notifier support in clk_prepare/clk_unprepare
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On Thu, 2013-03-14 at 17:31 +0800, Bill Huang wrote:
> Add the below two notifier events so drivers which are interested in
> knowing the clock status can act accordingly. This is extremely useful
> in some of the DVFS (Dynamic Voltage Frequency Scaling) design.
>
> CLK_PREPARED
> CLK_UNPREPARED
>
> Signed-off-by: Bill Huang <bilhuang@nvidia.com>
> ---
> drivers/clk/clk.c | 3 +++
> include/linux/clk.h | 2 ++
> 2 files changed, 5 insertions(+)
>
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index ed87b24..3292cec 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -550,6 +550,7 @@ void clk_unprepare(struct clk *clk)
> {
> mutex_lock(&prepare_lock);
> __clk_unprepare(clk);
> + __clk_notify(clk, CLK_UNPREPARED, clk->rate, clk->rate);
> mutex_unlock(&prepare_lock);
> }
> EXPORT_SYMBOL_GPL(clk_unprepare);
> @@ -598,6 +599,8 @@ int clk_prepare(struct clk *clk)
>
> mutex_lock(&prepare_lock);
> ret = __clk_prepare(clk);
> + if (!ret)
> + __clk_notify(clk, CLK_PREPARED, clk->rate, clk->rate);
> mutex_unlock(&prepare_lock);
>
> return ret;
> diff --git a/include/linux/clk.h b/include/linux/clk.h
> index b3ac22d..16c1d92 100644
> --- a/include/linux/clk.h
> +++ b/include/linux/clk.h
> @@ -43,6 +43,8 @@ struct clk;
> #define PRE_RATE_CHANGE BIT(0)
> #define POST_RATE_CHANGE BIT(1)
> #define ABORT_RATE_CHANGE BIT(2)
> +#define CLK_PREPARED BIT(3)
> +#define CLK_UNPREPARED BIT(4)
>
> /**
> * struct clk_notifier - associate a clk with a notifier
Sorry, I'll send v3 since this bread build.




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