linux-kernel - [RFC,PATCH 2/7 v2] Generic support for fixed-rate clocks

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Message-Id: <1263279511.160846.853659232765.2.gpush@pororo>
Date:	Tue, 12 Jan 2010 17:58:31 +1100
From:	Jeremy Kerr <jeremy.kerr@...onical.com>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: [RFC,PATCH 2/7 v2] Generic support for fixed-rate clocks

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@...onical.com>

---
 include/linux/clk.h |   12 ++++++++++++
 kernel/Makefile     |    1 +
 kernel/clk.c        |   25 +++++++++++++++++++++++++
 3 files changed, 38 insertions(+)

diff --git a/include/linux/clk.h b/include/linux/clk.h
index 1a6199e..8293421 100644
--- a/include/linux/clk.h
+++ b/include/linux/clk.h
@@ -97,6 +97,18 @@ static inline struct clk *clk_get_parent(struct clk *clk)
 	return ERR_PTR(-ENOSYS);
 }
 
+/* Simple fixed-rate clock */
+struct clk_fixed {
+	struct clk	clk;
+	unsigned long	rate;
+};
+
+extern struct clk_operations clk_fixed_operations;
+
+#define DEFINE_CLK_FIXED(r) { \
+	.clk = { .ops = &clk_fixed_operations }, \
+	.rate = (r) \
+};
 
 #else /* !CONFIG_USE_COMMON_STRUCT_CLK */
 
diff --git a/kernel/Makefile b/kernel/Makefile
index 864ff75..f63d021 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -100,6 +100,7 @@ obj-$(CONFIG_SLOW_WORK_DEBUG) += slow-work-debugfs.o
 obj-$(CONFIG_PERF_EVENTS) += perf_event.o
 obj-$(CONFIG_HAVE_HW_BREAKPOINT) += hw_breakpoint.o
 obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
+obj-$(CONFIG_USE_COMMON_STRUCT_CLK) += clk.o
 
 ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
 # According to Alan Modra <alan@...uxcare.com.au>, the -fno-omit-frame-pointer is
diff --git a/kernel/clk.c b/kernel/clk.c
new file mode 100644
index 0000000..353736c
--- /dev/null
+++ b/kernel/clk.c
@@ -0,0 +1,25 @@
+/*
+ * Copyright (C) 2010 Canonical Ltd <jeremy.kerr@...onical.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.
+ *
+ * Standard functionality for the common clock API.
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+
+#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_operations clk_fixed_operations = {
+	.get_rate = clk_fixed_get_rate,
+};
+
+EXPORT_SYMBOL_GPL(clk_fixed_operations);
--
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