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    Subject[RFC,PATCH 2/3] clk: Generic support for fixed-rate clocks
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    Date
    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 12e0daf..51dbd33 100644
    --- a/drivers/clk/clk.c
    +++ b/drivers/clk/clk.c
    @@ -132,3 +132,17 @@ struct clk *clk_get_parent(struct clk *clk)
    return ERR_PTR(-ENOSYS);
    }
    EXPORT_SYMBOL_GPL(clk_get_parent);
    +
    +/* 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 e081ca1..daa2d5a 100644
    --- a/include/linux/clk.h
    +++ b/include/linux/clk.h
    @@ -176,6 +176,22 @@ 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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