Prev: [PATCH 0/2] Common struct clk implementation, v6
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From: Jeremy Kerr on 11 Jul 2010 22:40
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(a)canonical.com>

---
include/linux/clk.h | 13 +++++++++++++
kernel/clk.c | 14 ++++++++++++++
2 files changed, 27 insertions(+)

diff --git a/include/linux/clk.h b/include/linux/clk.h
index a95cc82..85e1d44 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -90,6 +90,19 @@ static inline void clk_common_init(struct clk *clk)
clk->enable_count = 0;
}

+/* Simple fixed-rate clock */
+struct clk_fixed {
+ struct clk clk;
+ unsigned long rate;
+};
+
+extern struct clk_ops clk_fixed_ops;
+
+#define INIT_CLK_FIXED(r) { \
+ .clk = INIT_CLK(clk_fixed_ops), \
+ .rate = (r) \
+}
+
#else /* !CONFIG_USE_COMMON_STRUCT_CLK */

/*
diff --git a/kernel/clk.c b/kernel/clk.c
index cdea25f..32f25ef 100644
--- a/kernel/clk.c
+++ b/kernel/clk.c
@@ -99,3 +99,17 @@ 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);
--
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Prev: [PATCH 0/2] Common struct clk implementation, v6
Next: [PATCH 1/2] Add a common struct clk