linux-kernel - [PATCH 05/14] clkdev: Add clk

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Message-Id: <1454982341-22715-6-git-send-email-sboyd@codeaurora.org>
Date:	Mon,  8 Feb 2016 17:45:32 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Mike Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>
Subject: [PATCH 05/14] clkdev: Add clk_hw based registration APIs

Now that we have a clk registration API that doesn't return
struct clks, we need to have some way to hand out struct clks via
the clk_get() APIs that doesn't involve associating struct clk
pointers with a struct clk_lookup. Luckily, clkdev already
operates on struct clk_hw pointers, except for the registration
facing APIs where it converts struct clk pointers into struct
clk_hw pointers almost immediately.

Let's add clk_hw based registration APIs so that we can skip the
conversion step and provide a way for clk provider drivers to
operate exclusively on clk_hw structs. This way we clearly
split the API between consumers and providers.

Cc: Russell King <linux@....linux.org.uk>
Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
---
 drivers/clk/clkdev.c   | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/clkdev.h |  7 ++++++
 2 files changed, 67 insertions(+)

diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index ae61f2e57048..485d3b141843 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -301,6 +301,20 @@ clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
 }
 EXPORT_SYMBOL(clkdev_alloc);
 
+struct clk_lookup *
+clkdev_hw_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt, ...)
+{
+	struct clk_lookup *cl;
+	va_list ap;
+
+	va_start(ap, dev_fmt);
+	cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
+	va_end(ap);
+
+	return cl;
+}
+EXPORT_SYMBOL(clkdev_hw_alloc);
+
 /**
  * clkdev_create - allocate and add a clkdev lookup structure
  * @clk: struct clk to associate with all clk_lookups
@@ -324,6 +338,29 @@ struct clk_lookup *clkdev_create(struct clk *clk, const char *con_id,
 }
 EXPORT_SYMBOL_GPL(clkdev_create);
 
+/**
+ * clkdev_hw_create - allocate and add a clkdev lookup structure
+ * @hw: struct clk_hw to associate with all clk_lookups
+ * @con_id: connection ID string on device
+ * @dev_fmt: format string describing device name
+ *
+ * Returns a clk_lookup structure, which can be later unregistered and
+ * freed.
+ */
+struct clk_lookup *clkdev_hw_create(struct clk_hw *hw, const char *con_id,
+	const char *dev_fmt, ...)
+{
+	struct clk_lookup *cl;
+	va_list ap;
+
+	va_start(ap, dev_fmt);
+	cl = vclkdev_create(hw, con_id, dev_fmt, ap);
+	va_end(ap);
+
+	return cl;
+}
+EXPORT_SYMBOL_GPL(clkdev_hw_create);
+
 int clk_add_alias(const char *alias, const char *alias_dev_name,
 	const char *con_id, struct device *dev)
 {
@@ -383,3 +420,26 @@ int clk_register_clkdev(struct clk *clk, const char *con_id,
 	return cl ? 0 : -ENOMEM;
 }
 EXPORT_SYMBOL(clk_register_clkdev);
+
+/**
+ * clk_hw_register_clkdev - register one clock lookup for a struct clk_hw
+ * @hw: struct clk_hw to associate with all clk_lookups
+ * @con_id: connection ID string on device
+ * @dev_id: format string describing device name
+ *
+ * con_id or dev_id may be NULL as a wildcard, just as in the rest of
+ * clkdev.
+ */
+int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id,
+	const char *dev_fmt, ...)
+{
+	struct clk_lookup *cl;
+	va_list ap;
+
+	va_start(ap, dev_fmt);
+	cl = vclkdev_create(hw, con_id, dev_fmt, ap);
+	va_end(ap);
+
+	return cl ? 0 : -ENOMEM;
+}
+EXPORT_SYMBOL(clk_hw_register_clkdev);
diff --git a/include/linux/clkdev.h b/include/linux/clkdev.h
index 43a8c2e8ac29..5084295617dc 100644
--- a/include/linux/clkdev.h
+++ b/include/linux/clkdev.h
@@ -15,6 +15,7 @@
 #include <asm/clkdev.h>
 
 struct clk;
+struct clk_hw;
 struct device;
 
 struct clk_lookup {
@@ -34,18 +35,24 @@ struct clk_lookup {
 
 struct clk_lookup *clkdev_alloc(struct clk *clk, const char *con_id,
 	const char *dev_fmt, ...) __printf(3, 4);
+struct clk_lookup *clkdev_hw_alloc(struct clk_hw *hw, const char *con_id,
+	const char *dev_fmt, ...) __printf(3, 4);
 
 void clkdev_add(struct clk_lookup *cl);
 void clkdev_drop(struct clk_lookup *cl);
 
 struct clk_lookup *clkdev_create(struct clk *clk, const char *con_id,
 	const char *dev_fmt, ...) __printf(3, 4);
+struct clk_lookup *clkdev_hw_create(struct clk_hw *hw, const char *con_id,
+	const char *dev_fmt, ...) __printf(3, 4);
 
 void clkdev_add_table(struct clk_lookup *, size_t);
 int clk_add_alias(const char *, const char *, const char *, struct device *);
 
 int clk_register_clkdev(struct clk *, const char *, const char *, ...)
 	__printf(3, 4);
+int clk_hw_register_clkdev(struct clk_hw *, const char *, const char *, ...)
+	__printf(3, 4);
 
 #ifdef CONFIG_COMMON_CLK
 int __clk_get(struct clk *clk);
-- 
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