clk: Use a separate struct for holding init data.

Create a struct clk_init_data to hold all data that needs to be passed from
the platfrom specific driver to the common clock framework during clock
registration. Add a pointer to this struct inside clk_hw.

This has several advantages:
* Completely hides struct clk from many clock platform drivers and static
  clock initialization code that don't care for static initialization of
  the struct clks.
* For platforms that want to do complete static initialization, it removed
  the need to directly mess with the struct clk's fields while still
  allowing to statically allocate struct clk. This keeps the code more
  future proof even if they include clk-private.h.
* Simplifies the generic clk_register() function and allows adding optional
  fields in the future without modifying the function signature.
* Simplifies the static initialization of clocks on all platforms by
  removing the need for forward delcarations or convoluted macros.

Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
[mturquette@linaro.org: kept DEFINE_CLK_* macros and __clk_init]
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Jeremy Kerr <jeremy.kerr@canonical.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergman <arnd.bergmann@linaro.org>
Cc: Paul Walmsley <paul@pwsan.com>
Cc: Shawn Guo <shawn.guo@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Jamie Iles <jamie@jamieiles.com>
Cc: Richard Zhao <richard.zhao@linaro.org>
Cc: Saravana Kannan <skannan@codeaurora.org>
Cc: Magnus Damm <magnus.damm@gmail.com>
Cc: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Linus Walleij <linus.walleij@stericsson.com>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Cc: Amit Kucheria <amit.kucheria@linaro.org>
Cc: Deepak Saxena <dsaxena@linaro.org>
Cc: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 54 insertions, 35 deletions

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 2dd20c01134d..c81803b9ba35 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -1169,26 +1169,6 @@ EXPORT_SYMBOL_GPL(clk_set_parent);
  *
  * Initializes the lists in struct clk, queries the hardware for the
  * parent and rate and sets them both.
- *
- * Any struct clk passed into __clk_init must have the following members
- * populated:
- *      .name
- *      .ops
- *      .hw
- *      .parent_names
- *      .num_parents
- *      .flags
- *
- * Essentially, everything that would normally be passed into clk_register is
- * assumed to be initialized already in __clk_init.  The other members may be
- * populated, but are optional.
- *
- * __clk_init is only exposed via clk-private.h and is intended for use with
- * very large numbers of clocks that need to be statically initialized.  It is
- * a layering violation to include clk-private.h from any code which implements
- * a clock's .ops; as such any statically initialized clock data MUST be in a
- * separate C file from the logic that implements it's operations.  Returns 0
- * on success, otherwise an error code.
  */
 int __clk_init(struct device *dev, struct clk *clk)
 {
@@ -1321,14 +1301,47 @@ out:
 }
 
 /**
+ * __clk_register - register a clock and return a cookie.
+ *
+ * Same as clk_register, except that the .clk field inside hw shall point to a
+ * preallocated (generally statically allocated) struct clk. None of the fields
+ * of the struct clk need to be initialized.
+ *
+ * The data pointed to by .init and .clk field shall NOT be marked as init
+ * data.
+ *
+ * __clk_register is only exposed via clk-private.h and is intended for use with
+ * very large numbers of clocks that need to be statically initialized.  It is
+ * a layering violation to include clk-private.h from any code which implements
+ * a clock's .ops; as such any statically initialized clock data MUST be in a
+ * separate C file from the logic that implements it's operations.  Returns 0
+ * on success, otherwise an error code.
+ */
+struct clk *__clk_register(struct device *dev, struct clk_hw *hw)
+{
+        int ret;
+        struct clk *clk;
+
+        clk = hw->clk;
+        clk->name = hw->init->name;
+        clk->ops = hw->init->ops;
+        clk->hw = hw;
+        clk->flags = hw->init->flags;
+        clk->parent_names = hw->init->parent_names;
+        clk->num_parents = hw->init->num_parents;
+
+        ret = __clk_init(dev, clk);
+        if (ret)
+                return ERR_PTR(ret);
+
+        return clk;
+}
+EXPORT_SYMBOL_GPL(__clk_register);
+
+/**
  * clk_register - allocate a new clock, register it and return an opaque cookie
  * @dev: device that is registering this clock
- * @name: clock name
- * @ops: operations this clock supports
  * @hw: link to hardware-specific clock data
- * @parent_names: array of string names for all possible parents
- * @num_parents: number of possible parents
- * @flags: framework-level hints and quirks
  *
  * clk_register is the primary interface for populating the clock tree with new
  * clock nodes.  It returns a pointer to the newly allocated struct clk which
@@ -1336,9 +1349,7 @@ out:
  * rest of the clock API.  In the event of an error clk_register will return an
  * error code; drivers must test for an error code after calling clk_register.
  */
-struct clk *clk_register(struct device *dev, const char *name,
-                const struct clk_ops *ops, struct clk_hw *hw,
-                const char **parent_names, u8 num_parents, unsigned long flags)
+struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 {
         int i, ret;
         struct clk *clk;
@@ -1350,15 +1361,20 @@ struct clk *clk_register(struct device *dev, const char *name,
                 goto fail_out;
         }
 
-        clk->name = name;
-        clk->ops = ops;
+        clk->name = kstrdup(hw->init->name, GFP_KERNEL);
+        if (!clk->name) {
+                pr_err("%s: could not allocate clk->name\n", __func__);
+                ret = -ENOMEM;
+                goto fail_name;
+        }
+        clk->ops = hw->init->ops;
         clk->hw = hw;
-        clk->flags = flags;
-        clk->num_parents = num_parents;
+        clk->flags = hw->init->flags;
+        clk->num_parents = hw->init->num_parents;
         hw->clk = clk;
 
         /* allocate local copy in case parent_names is __initdata */
-        clk->parent_names = kzalloc((sizeof(char*) * num_parents),
+        clk->parent_names = kzalloc((sizeof(char*) * clk->num_parents),
                         GFP_KERNEL);
 
         if (!clk->parent_names) {
@@ -1369,8 +1385,9 @@ struct clk *clk_register(struct device *dev, const char *name,
 
 
         /* copy each string name in case parent_names is __initdata */
-        for (i = 0; i < num_parents; i++) {
-                clk->parent_names[i] = kstrdup(parent_names[i], GFP_KERNEL);
+        for (i = 0; i < clk->num_parents; i++) {
+                clk->parent_names[i] = kstrdup(hw->init->parent_names[i],
+                                                GFP_KERNEL);
                 if (!clk->parent_names[i]) {
                         pr_err("%s: could not copy parent_names\n", __func__);
                         ret = -ENOMEM;
@@ -1387,6 +1404,8 @@ fail_parent_names_copy:
                 kfree(clk->parent_names[i]);
         kfree(clk->parent_names);
 fail_parent_names:
+        kfree(clk->name);
+fail_name:
         kfree(clk);
 fail_out:
         return ERR_PTR(ret);