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    SubjectRe: [RFC,PATCH 2/3] clk: Generic support for fixed-rate clocks
    Date
    Hi, guys,
    is there a documentation about clk framework?
    Or only to read the sources?

    Thanks a lot, and best regards


    On Wednesday 09 February 2011 07:41:33 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 c35478a..bbbdb0d 100644
    > --- a/drivers/clk/clk.c
    > +++ b/drivers/clk/clk.c
    > @@ -124,3 +124,17 @@ 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 fe806b7..e67fdb0 100644
    > --- a/include/linux/clk.h
    > +++ b/include/linux/clk.h
    > @@ -185,6 +185,22 @@ 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;
    > +};
    > +
    > +extern struct clk_ops clk_fixed_ops;
    > +
    > +#define INIT_CLK_FIXED(name, r) { \
    > + .clk = INIT_CLK(name.clk, clk_fixed_ops), \
    > + .rate = (r) \
    > +}
    > +
    > +#define DEFINE_CLK_FIXED(name, r) \
    > + struct clk_fixed name = INIT_CLK_FIXED(name, r)
    > +
    > #else /* !CONFIG_USE_COMMON_STRUCT_CLK */
    >
    > /*
    > --
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