This patch is the basic clk version of 'clk: core: copy parent_names &
return error codes'.

The registration functions are changed to allow the core code to copy
the array of strings and allow platforms to declare those arrays as
__initdata.

This patch also converts all of the basic clk registration functions to
return error codes which better aligns them with the existing clk.h api.

Signed-off-by: Mike Turquette <mturque...@linaro.org>
Cc: Arnd Bergman <arnd.bergm...@linaro.org>
Cc: Olof Johansson <o...@lixom.net>
Cc: Russell King <li...@arm.linux.org.uk>
Cc: Sascha Hauer <s.ha...@pengutronix.de>
Cc: Shawn Guo <shawn....@freescale.com>
Cc: Richard Zhao <richard.z...@linaro.org>
Cc: Saravana Kannan <skan...@codeaurora.org>
Cc: Mark Brown <broo...@opensource.wolfsonmicro.com>
Cc: Andrew Lunn <and...@lunn.ch>
Cc: Rajendra Nayak <rna...@ti.com>
Cc: Viresh Kumar <viresh.ku...@st.com>
---
 drivers/clk/clk-divider.c    |   46 ++++++++++++++++++++++++++---------
 drivers/clk/clk-fixed-rate.c |   54 ++++++++++++++++++++++++++---------------
 drivers/clk/clk-gate.c       |   48 +++++++++++++++++++++++++++----------
 drivers/clk/clk-mux.c        |    8 +++++-
 include/linux/clk-provider.h |    2 -
 5 files changed, 110 insertions(+), 48 deletions(-)

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index b1c4b02..add784b 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -153,16 +153,29 @@ const struct clk_ops clk_divider_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_divider_ops);
 
+/**
+ * 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_divider *div;
-       struct clk *clk;
+       struct clk *clk = ERR_PTR(-ENOMEM);
+       const char *parent_names[1];
 
+       /* allocate the divider */
        div = kzalloc(sizeof(struct clk_divider), GFP_KERNEL);
-
        if (!div) {
                pr_err("%s: could not allocate divider clk\n", __func__);
                return NULL;
@@ -175,23 +188,32 @@ struct clk *clk_register_divider(struct device *dev, 
const char *name,
        div->flags = clk_divider_flags;
        div->lock = lock;
 
+       /* allocate the temporary parent_names */
        if (parent_name) {
-               div->parent[0] = kstrdup(parent_name, GFP_KERNEL);
-               if (!div->parent[0])
-                       goto out;
+               parent_names[0] = kstrdup(parent_name, GFP_KERNEL);
+               if (!parent_names[0]) {
+                       pr_err("%s: could not allocate parent_names\n",
+                                       __func__);
+                       goto fail_parent_names;
+               }
        }
 
+       /* register the clock */
        clk = clk_register(dev, name,
                        &clk_divider_ops, &div->hw,
-                       div->parent,
+                       (parent_name ? parent_names: NULL),
                        (parent_name ? 1 : 0),
                        flags);
-       if (clk)
-               return clk;
 
-out:
-       kfree(div->parent[0]);
-       kfree(div);
+       /* free the temporary parent_names */
+       if (parent_name)
+               kfree(parent_names[0]);
+
+       if (!IS_ERR(clk))
+               goto out;
 
-       return NULL;
+fail_parent_names:
+       kfree(div);
+out:
+       return clk;
 }
diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c
index 027e477..ecd20ae 100644
--- a/drivers/clk/clk-fixed-rate.c
+++ b/drivers/clk/clk-fixed-rate.c
@@ -38,44 +38,58 @@ const struct clk_ops clk_fixed_rate_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_fixed_rate_ops);
 
+/**
+ * clk_register_fixed_rate - register fixed-rate clock with the clock framework
+ * @dev: device that is registering this clock
+ * @name: name of this clock
+ * @parent_name: name of clock's parent
+ * @flags: framework-specific flags
+ * @fixed_rate: non-adjustable clock rate
+ */
 struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
                const char *parent_name, unsigned long flags,
                unsigned long fixed_rate)
 {
        struct clk_fixed_rate *fixed;
-       char **parent_names = NULL;
-       u8 len;
+       struct clk *clk = ERR_PTR(-ENOMEM);
+       const char *parent_names[1];
 
+       /* allocate fixed-rate clock */
        fixed = kzalloc(sizeof(struct clk_fixed_rate), GFP_KERNEL);
-
        if (!fixed) {
                pr_err("%s: could not allocate fixed clk\n", __func__);
-               return ERR_PTR(-ENOMEM);
+               goto out;
        }
 
        /* struct clk_fixed_rate assignments */
        fixed->fixed_rate = fixed_rate;
 
+       /* allocate the temporary parent_names */
        if (parent_name) {
-               parent_names = kmalloc(sizeof(char *), GFP_KERNEL);
-
-               if (! parent_names)
-                       goto out;
-
-               len = sizeof(char) * strlen(parent_name);
-
-               parent_names[0] = kmalloc(len, GFP_KERNEL);
-
-               if (!parent_names[0])
-                       goto out;
-
-               strncpy(parent_names[0], parent_name, len);
+               parent_names[0] = kstrdup(parent_name, GFP_KERNEL);
+               if (!parent_names[0]) {
+                       pr_err("%s: could not allocate parent_names\n",
+                                       __func__);
+                       goto fail_parent_names;
+               }
        }
 
-out:
-       return clk_register(dev, name,
+       /* register the clock */
+       clk = clk_register(dev, name,
                        &clk_fixed_rate_ops, &fixed->hw,
-                       parent_names,
+                       (parent_name ? parent_names : NULL),
                        (parent_name ? 1 : 0),
                        flags);
+
+       /* free the temporary parent_names */
+       if (parent_name)
+               kfree(parent_names[0]);
+
+       if (!IS_ERR(clk))
+               goto out;
+
+fail_parent_names:
+       kfree(fixed);
+out:
+       return clk;
 }
diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
index fe2ff9e..288fb5e 100644
--- a/drivers/clk/clk-gate.c
+++ b/drivers/clk/clk-gate.c
@@ -105,19 +105,31 @@ const struct clk_ops clk_gate_ops = {
 };
 EXPORT_SYMBOL_GPL(clk_gate_ops);
 
+/**
+ * clk_register_gate - register a gate clock with the clock framework
+ * @dev: device that is registering this clock
+ * @name: name of this clock
+ * @parent_name: name of this clock's parent
+ * @flags: framework-specific flags for this clock
+ * @reg: register address to control gating of this clock
+ * @bit_idx: which bit in the register controls gating of this clock
+ * @clk_gate_flags: gate-specific flags for this clock
+ * @lock: shared register lock for this clock
+ */
 struct clk *clk_register_gate(struct device *dev, const char *name,
                const char *parent_name, unsigned long flags,
                void __iomem *reg, u8 bit_idx,
                u8 clk_gate_flags, spinlock_t *lock)
 {
        struct clk_gate *gate;
-       struct clk *clk;
+       struct clk *clk = ERR_PTR(-ENOMEM);
+       const char *parent_names[1];
 
+       /* allocate the gate */
        gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
-
        if (!gate) {
                pr_err("%s: could not allocate gated clk\n", __func__);
-               return NULL;
+               goto out;
        }
 
        /* struct clk_gate assignments */
@@ -126,22 +138,32 @@ struct clk *clk_register_gate(struct device *dev, const 
char *name,
        gate->flags = clk_gate_flags;
        gate->lock = lock;
 
+       /* allocate the temporary parent_names */
        if (parent_name) {
-               gate->parent[0] = kstrdup(parent_name, GFP_KERNEL);
-               if (!gate->parent[0])
-                       goto out;
+               parent_names[0] = kstrdup(parent_name, GFP_KERNEL);
+               if (!parent_names[0]) {
+                       pr_err("%s: could not allocate parent_names\n",
+                                       __func__);
+                       goto fail_parent_names;
+               }
        }
 
+       /* register the clock */
        clk = clk_register(dev, name,
                        &clk_gate_ops, &gate->hw,
-                       gate->parent,
+                       (parent_name ? parent_names : NULL),
                        (parent_name ? 1 : 0),
                        flags);
-       if (clk)
-               return clk;
-out:
-       kfree(gate->parent[0]);
-       kfree(gate);
 
-       return NULL;
+       /* free the temporary parent_names */
+       if (parent_name)
+               kfree(parent_names[0]);
+
+       if (!IS_ERR(clk))
+               goto out;
+
+fail_parent_names:
+       kfree(gate);
+out:
+       return clk;
 }
diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
index bd5e598..5b237b6 100644
--- a/drivers/clk/clk-mux.c
+++ b/drivers/clk/clk-mux.c
@@ -94,6 +94,7 @@ struct clk *clk_register_mux(struct device *dev, const char 
*name,
                u8 clk_mux_flags, spinlock_t *lock)
 {
        struct clk_mux *mux;
+       struct clk *clk;
 
        mux = kzalloc(sizeof(struct clk_mux), GFP_KERNEL);
 
@@ -109,6 +110,11 @@ struct clk *clk_register_mux(struct device *dev, const 
char *name,
        mux->flags = clk_mux_flags;
        mux->lock = lock;
 
-       return clk_register(dev, name, &clk_mux_ops, &mux->hw,
+       clk = clk_register(dev, name, &clk_mux_ops, &mux->hw,
                        parent_names, num_parents, flags);
+
+       if (IS_ERR(clk))
+               kfree(mux);
+
+       return clk;
 }
diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
index 97f9fab..3323d24 100644
--- a/include/linux/clk-provider.h
+++ b/include/linux/clk-provider.h
@@ -176,7 +176,6 @@ struct clk_gate {
        u8              bit_idx;
        u8              flags;
        spinlock_t      *lock;
-       const char      *parent[1];
 };
 
 #define CLK_GATE_SET_TO_DISABLE                BIT(0)
@@ -214,7 +213,6 @@ struct clk_divider {
        u8              width;
        u8              flags;
        spinlock_t      *lock;
-       const char      *parent[1];
 };
 
 #define CLK_DIVIDER_ONE_BASED          BIT(0)
-- 
1.7.5.4


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