clk: divider: Add support for specifying parents via DT/pointers

After commit fc0c209c14 ("clk: Allow parents to be specified without
string names") we can use DT or direct clk_hw pointers to specify
parents. Create a generic function that shouldn't be used very often to
encode the multitude of ways of registering a divider clk with different
parent information. Then add a bunch of wrapper macros that only pass
down what needs to be passed down to the generic function to support
this with less arguments.

Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lkml.kernel.org/r/20190830150923.259497-13-sboyd@kernel.org
[sboyd@kernel.org: Export __clk_hw_register_divider]

drivers/clk/clk-divider.c

@@ -463,11 +463,12 @@ const struct clk_ops clk_divider_ro_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_divider_ro_ops);
 
-static struct clk_hw *_register_divider(struct device *dev, const char *name,
+struct clk_hw *__clk_hw_register_divider(struct device *dev,
-		const char *parent_name, unsigned long flags,
+		struct device_node *np, const char *name,
-		void __iomem *reg, u8 shift, u8 width,
+		const char *parent_name, const struct clk_hw *parent_hw,
-		u8 clk_divider_flags, const struct clk_div_table *table,
+		const struct clk_parent_data *parent_data, unsigned long flags,
-		spinlock_t *lock)
+		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_hw *hw;
@@ -514,55 +515,7 @@ static struct clk_hw *_register_divider(struct device *dev, const char *name,
 
 	return hw;
 }
-
+EXPORT_SYMBOL_GPL(__clk_hw_register_divider);
-/**
- * clk_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 *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 *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
@@ -586,39 +539,15 @@ struct clk *clk_register_divider_table(struct device *dev, const char *name,
 {
 	struct clk_hw *hw;
 
-	hw =  _register_divider(dev, name, parent_name, flags, reg, shift,
+	hw =  __clk_hw_register_divider(dev, NULL, name, parent_name, NULL,
-			width, clk_divider_flags, table, lock);
+			NULL, 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;

include/linux/clk-provider.h

@@ -626,24 +626,153 @@ int divider_get_val(unsigned long rate, unsigned long parent_rate,
 		const struct clk_div_table *table, u8 width,
 		unsigned long flags);
 
-struct clk *clk_register_divider(struct device *dev, const char *name,
+struct clk_hw *__clk_hw_register_divider(struct device *dev,
-		const char *parent_name, unsigned long flags,
+		struct device_node *np, const char *name,
-		void __iomem *reg, u8 shift, u8 width,
+		const char *parent_name, const struct clk_hw *parent_hw,
-		u8 clk_divider_flags, spinlock_t *lock);
+		const struct clk_parent_data *parent_data, unsigned long flags,
-struct clk_hw *clk_hw_register_divider(struct device *dev, const char *name,
+		void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags,
-		const char *parent_name, unsigned long flags,
+		const struct clk_div_table *table, spinlock_t *lock);
-		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,
+ * clk_register_divider - register a divider clock with the clock framework
-		void __iomem *reg, u8 shift, u8 width,
+ * @dev: device registering this clock
-		u8 clk_divider_flags, const struct clk_div_table *table,
+ * @name: name of this clock
-		spinlock_t *lock);
+ * @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
+ */
+#define clk_register_divider(dev, name, parent_name, flags, reg, shift, width, \
+			     clk_divider_flags, lock)			       \
+	clk_register_divider_table((dev), (name), (parent_name), (flags),      \
+				   (reg), (shift), (width),		       \
+				   (clk_divider_flags), NULL, (lock))
+/**
+ * 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
+ */
+#define clk_hw_register_divider(dev, name, parent_name, flags, reg, shift,    \
+				width, clk_divider_flags, lock)		      \
+	__clk_hw_register_divider((dev), NULL, (name), (parent_name), NULL,   \
+				  NULL, (flags), (reg), (shift), (width),     \
+				  (clk_divider_flags), NULL, (lock))
+/**
+ * clk_hw_register_divider_parent_hw - register a divider clock with the clock
+ * framework
+ * @dev: device registering this clock
+ * @name: name of this clock
+ * @parent_hw: pointer to parent clk
+ * @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
+ */
+#define clk_hw_register_divider_parent_hw(dev, name, parent_hw, flags, reg,   \
+					  shift, width, clk_divider_flags,    \
+					  lock)				      \
+	__clk_hw_register_divider((dev), NULL, (name), NULL, (parent_hw),     \
+				  NULL, (flags), (reg), (shift), (width),     \
+				  (clk_divider_flags), NULL, (lock))
+/**
+ * clk_hw_register_divider_parent_data - register a divider clock with the clock
+ * framework
+ * @dev: device registering this clock
+ * @name: name of this clock
+ * @parent_data: parent clk data
+ * @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
+ */
+#define clk_hw_register_divider_parent_data(dev, name, parent_data, flags,    \
+					    reg, shift, width,		      \
+					    clk_divider_flags, lock)	      \
+	__clk_hw_register_divider((dev), NULL, (name), NULL, NULL,	      \
+				  (parent_data), (flags), (reg), (shift),     \
+				  (width), (clk_divider_flags), NULL, (lock))
+/**
+ * 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
+ */
+#define clk_hw_register_divider_table(dev, name, parent_name, flags, reg,     \
+				      shift, width, clk_divider_flags, table, \
+				      lock)				      \
+	__clk_hw_register_divider((dev), NULL, (name), (parent_name), NULL,   \
+				  NULL, (flags), (reg), (shift), (width),     \
+				  (clk_divider_flags), (table), (lock))
+/**
+ * clk_hw_register_divider_table_parent_hw - register a table based divider
+ * clock with the clock framework
+ * @dev: device registering this clock
+ * @name: name of this clock
+ * @parent_hw: pointer to parent clk
+ * @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
+ */
+#define clk_hw_register_divider_table_parent_hw(dev, name, parent_hw, flags,  \
+						reg, shift, width,	      \
+						clk_divider_flags, table,     \
+						lock)			      \
+	__clk_hw_register_divider((dev), NULL, (name), NULL, (parent_hw),     \
+				  NULL, (flags), (reg), (shift), (width),     \
+				  (clk_divider_flags), (table), (lock))
+/**
+ * clk_hw_register_divider_table_parent_data - register a table based divider
+ * clock with the clock framework
+ * @dev: device registering this clock
+ * @name: name of this clock
+ * @parent_data: parent clk data
+ * @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
+ */
+#define clk_hw_register_divider_table_parent_data(dev, name, parent_data,     \
+						  flags, reg, shift, width,   \
+						  clk_divider_flags, table,   \
+						  lock)			      \
+	__clk_hw_register_divider((dev), NULL, (name), NULL, NULL,	      \
+				  (parent_data), (flags), (reg), (shift),     \
+				  (width), (clk_divider_flags), (table),      \
+				  (lock))
+
 void clk_unregister_divider(struct clk *clk);
 void clk_hw_unregister_divider(struct clk_hw *hw);