[PATCH 2/2] clk: Generic support for fixed-rate clocks
From: Jeremy Kerr <hidden>
Date: 2011-01-05 03:18:55
Subsystem:
clk api, the rest · Maintainers:
Russell King, Linus Torvalds
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 <redacted> --- include/linux/clk.h | 16 ++++++++++++++++ kernel/clk.c | 14 ++++++++++++++ 2 files changed, 30 insertions(+)
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 95c49b1..6cef9fe 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h@@ -164,6 +164,22 @@ 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) \ +} + +#define DEFINE_CLK_FIXED(name, r) \ + struct clk_fixed name = INIT_CLK_FIXED(name, r) + #else /* !CONFIG_USE_COMMON_STRUCT_CLK */ /*
diff --git a/kernel/clk.c b/kernel/clk.c
index 8de8fe3..6c38cc0 100644
--- a/kernel/clk.c
+++ b/kernel/clk.c@@ -100,3 +100,17 @@ 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);