Subject: [PATCH 06/14] clk: divider: Add hw based registration APIs

From: [email-masked] (Stephen Boyd)
Date: Mon, 8 Feb 2016 17:45:33 -0800

Add registration APIs in the clk divider code to return struct
clk_hw pointers instead of struct clk pointers. This way we hide
the struct clk pointer from providers unless they need to use
consumer facing APIs.

Signed-off-by: Stephen Boyd <[email-masked]>
---
 drivers/clk/clk-divider.c    | 91 ++++++++++++++++++++++++++++++++++++++++----
 include/linux/clk-provider.h | 10 +++++
 2 files changed, 93 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index ded3ff4b91b9..65ea60c32856 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -423,15 +423,16 @@ const struct clk_ops clk_divider_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_divider_ops);
 
-static struct clk *_register_divider(struct device *dev, const char *name,
+static struct clk_hw *_register_divider(struct device *dev, const char *name,
 		const char *parent_name, unsigned long flags,
 		void __iomem *reg, u8 shift, u8 width,
 		u8 clk_divider_flags, const struct clk_div_table *table,
 		spinlock_t *lock)
 {
 	struct clk_divider *div;
-	struct clk *clk;
+	struct clk_hw *hw;
 	struct clk_init_data init;
+	int ret;
 
 	if (clk_divider_flags & CLK_DIVIDER_HIWORD_MASK) {
 		if (width + shift > 16) {
@@ -461,12 +462,14 @@ static struct clk *_register_divider(struct device *dev, const char *name,
 	div->table = table;
 
 	/* register the clock */
-	clk = clk_register(dev, &div->hw);
-
-	if (IS_ERR(clk))
+	hw = &div->hw;
+	ret = clk_hw_register(dev, hw);
+	if (ret) {
 		kfree(div);
+		hw = ERR_PTR(ret);
+	}
 
-	return clk;
+	return hw;
 }
 
 /**
@@ -486,12 +489,39 @@ struct clk *clk_register_divider(struct device *dev, const char *name,
 		void __iomem *reg, u8 shift, u8 width,
 		u8 clk_divider_flags, spinlock_t *lock)
 {
-	return _register_divider(dev, name, parent_name, flags, reg, shift,
+	struct clk_hw *hw;
+
+	hw =  _register_divider(dev, name, parent_name, flags, reg, shift,
 			width, clk_divider_flags, NULL, lock);
+	if (IS_ERR(hw))
+		return ERR_CAST(hw);
+	return hw->clk;
 }
 EXPORT_SYMBOL_GPL(clk_register_divider);
 
 /**
+ * clk_hw_register_divider - register a divider clock with the clock framework
+ * @dev: device registering this clock
+ * @name: name of this clock
+ * @parent_name: name of clock's parent
+ * @flags: framework-specific flags
+ * @reg: register address to adjust divider
+ * @shift: number of bits to shift the bitfield
+ * @width: width of the bitfield
+ * @clk_divider_flags: divider-specific flags for this clock
+ * @lock: shared register lock for this clock
+ */
+struct clk_hw *clk_hw_register_divider(struct device *dev, const char *name,
+		const char *parent_name, unsigned long flags,
+		void __iomem *reg, u8 shift, u8 width,
+		u8 clk_divider_flags, spinlock_t *lock)
+{
+	return _register_divider(dev, name, parent_name, flags, reg, shift,
+			width, clk_divider_flags, NULL, lock);
+}
+EXPORT_SYMBOL_GPL(clk_hw_register_divider);
+
+/**
  * clk_register_divider_table - register a table based divider clock with
  * the clock framework
  * @dev: device registering this clock
@@ -511,11 +541,41 @@ struct clk *clk_register_divider_table(struct device *dev, const char *name,
 		u8 clk_divider_flags, const struct clk_div_table *table,
 		spinlock_t *lock)
 {
-	return _register_divider(dev, name, parent_name, flags, reg, shift,
+	struct clk_hw *hw;
+
+	hw =  _register_divider(dev, name, parent_name, flags, reg, shift,
 			width, clk_divider_flags, table, lock);
+	if (IS_ERR(hw))
+		return ERR_CAST(hw);
+	return hw->clk;
 }
 EXPORT_SYMBOL_GPL(clk_register_divider_table);
 
+/**
+ * clk_hw_register_divider_table - register a table based divider clock with
+ * the clock framework
+ * @dev: device registering this clock
+ * @name: name of this clock
+ * @parent_name: name of clock's parent
+ * @flags: framework-specific flags
+ * @reg: register address to adjust divider
+ * @shift: number of bits to shift the bitfield
+ * @width: width of the bitfield
+ * @clk_divider_flags: divider-specific flags for this clock
+ * @table: array of divider/value pairs ending with a div set to 0
+ * @lock: shared register lock for this clock
+ */
+struct clk_hw *clk_hw_register_divider_table(struct device *dev,
+		const char *name, const char *parent_name, unsigned long flags,
+		void __iomem *reg, u8 shift, u8 width,
+		u8 clk_divider_flags, const struct clk_div_table *table,
+		spinlock_t *lock)
+{
+	return _register_divider(dev, name, parent_name, flags, reg, shift,
+			width, clk_divider_flags, table, lock);
+}
+EXPORT_SYMBOL_GPL(clk_hw_register_divider_table);
+
 void clk_unregister_divider(struct clk *clk)
 {
 	struct clk_divider *div;
@@ -531,3 +591,18 @@ void clk_unregister_divider(struct clk *clk)
 	kfree(div);
 }
 EXPORT_SYMBOL_GPL(clk_unregister_divider);
+
+/**
+ * clk_hw_unregister_divider - unregister a clk divider
+ * @hw: hardware-specific clock data to unregister
+ */
+void clk_hw_unregister_divider(struct clk_hw *hw)
+{
+	struct clk_divider *div;
+
+	div = to_clk_divider(hw);
+
+	clk_hw_unregister(hw);
+	kfree(div);
+}
+EXPORT_SYMBOL_GPL(clk_hw_unregister_divider);
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 1af1afae05f8..666462958ef2 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -400,12 +400,22 @@ struct clk *clk_register_divider(struct device *dev, const char *name,
 		const char *parent_name, unsigned long flags,
 		void __iomem *reg, u8 shift, u8 width,
 		u8 clk_divider_flags, spinlock_t *lock);
+struct clk_hw *clk_hw_register_divider(struct device *dev, const char *name,
+		const char *parent_name, unsigned long flags,
+		void __iomem *reg, u8 shift, u8 width,
+		u8 clk_divider_flags, spinlock_t *lock);
 struct clk *clk_register_divider_table(struct device *dev, const char *name,
 		const char *parent_name, unsigned long flags,
 		void __iomem *reg, u8 shift, u8 width,
 		u8 clk_divider_flags, const struct clk_div_table *table,
 		spinlock_t *lock);
+struct clk_hw *clk_hw_register_divider_table(struct device *dev,
+		const char *name, const char *parent_name, unsigned long flags,
+		void __iomem *reg, u8 shift, u8 width,
+		u8 clk_divider_flags, const struct clk_div_table *table,
+		spinlock_t *lock);
 void clk_unregister_divider(struct clk *clk);
+void clk_hw_unregister_divider(struct clk_hw *hw);
 
 /**
  * struct clk_mux - multiplexer clock
-- 
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