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Subject[PATCH v2 3/7] clk: Add fixed-rate clock
Date
From: Jeremy Kerr <jeremy.kerr@canonical.com>

Signed-off-by: Jeremy Kerr <jeremy.kerr@canonical.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Mike Turquette <mturquette@ti.com>
---
Changes since v1:
Add copyright header

drivers/clk/Kconfig | 4 ++++
drivers/clk/Makefile | 1 +
drivers/clk/clk-fixed.c | 24 ++++++++++++++++++++++++
include/linux/clk.h | 14 ++++++++++++++
4 files changed, 43 insertions(+), 0 deletions(-)
create mode 100644 drivers/clk/clk-fixed.c

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index c53ed59..d8313d7 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -8,3 +8,7 @@ config HAVE_MACH_CLKDEV

config GENERIC_CLK
bool
+
+config GENERIC_CLK_FIXED
+ bool
+ depends on GENERIC_CLK
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 570d5b9..9a3325a 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -1,3 +1,4 @@

obj-$(CONFIG_CLKDEV_LOOKUP) += clkdev.o
obj-$(CONFIG_GENERIC_CLK) += clk.o
+obj-$(CONFIG_GENERIC_CLK_FIXED) += clk-fixed.o
diff --git a/drivers/clk/clk-fixed.c b/drivers/clk/clk-fixed.c
new file mode 100644
index 0000000..956fb9a
--- /dev/null
+++ b/drivers/clk/clk-fixed.c
@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@canonical.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Simple fixed-rate clock implementation
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+
+#define to_clk_fixed(c) container_of(c, struct clk_hw_fixed, hw)
+
+static unsigned long clk_fixed_recalc_rate(struct clk_hw *hw)
+{
+ return to_clk_fixed(hw)->rate;
+}
+
+struct clk_hw_ops clk_fixed_ops = {
+ .recalc_rate = clk_fixed_recalc_rate,
+};
+EXPORT_SYMBOL_GPL(clk_fixed_ops);
diff --git a/include/linux/clk.h b/include/linux/clk.h
index 0d2cd5e..1903dd8 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -110,6 +110,20 @@ int clk_prepare(struct clk *clk);
*/
void clk_unprepare(struct clk *clk);

+/* Base clock implementations. Platform clock implementations can use these
+ * directly, or 'subclass' as approprate */
+
+#ifdef CONFIG_GENERIC_CLK_FIXED
+
+struct clk_hw_fixed {
+ struct clk_hw hw;
+ unsigned long rate;
+};
+
+extern struct clk_hw_ops clk_fixed_ops;
+
+#endif /* CONFIG_GENERIC_CLK_FIXED */
+
/**
* clk_register - register and initialize a new clock
*
--
1.7.4.1


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