clk: divider: Add hw based registration APIs

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 <sboyd@codeaurora.org>

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index 00e035b..a0f55bc 100644 (file)
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -426,15 +426,16 @@ const struct clk_ops clk_divider_ro_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_divider_ro_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) {
@@ -467,12 +468,14 @@ 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;
 }
 
 /**
@@ -492,11 +495,38 @@ 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
@@ -517,11 +547,41 @@ 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;
@@ -537,3 +597,18 @@ 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 bf8c8bb..8885d03 100644 (file)
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -407,12 +407,22 @@ 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