linux-kernel - [PATCH v2 3/7] clk: Add fixed-rate clock

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Message-Id: <1316730422-20027-4-git-send-email-mturquette@ti.com>
Date:	Thu, 22 Sep 2011 15:26:58 -0700
From:	Mike Turquette <mturquette@...com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-arm-kernel@...ts.infradead.org, jeremy.kerr@...onical.com,
	broonie@...nsource.wolfsonmicro.com, tglx@...utronix.de,
	linus.walleij@...ricsson.com, amit.kucheria@...aro.org,
	dsaxena@...aro.org, patches@...aro.org,
	linaro-dev@...ts.linaro.org, paul@...an.com,
	grant.likely@...retlab.ca, sboyd@...inc.com,
	shawn.guo@...escale.com, skannan@...cinc.com,
	magnus.damm@...il.com, arnd.bergmann@...aro.org,
	linux@....linux.org.uk, eric.miao@...aro.org,
	richard.zhao@...aro.org, Mike Turquette <mturquette@...com>
Subject: [PATCH v2 3/7] clk: Add fixed-rate clock

From: Jeremy Kerr <jeremy.kerr@...onical.com>

Signed-off-by: Jeremy Kerr <jeremy.kerr@...onical.com>
Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Signed-off-by: Mike Turquette <mturquette@...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@...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.
+ *
+ * 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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