clk: basic: improve parent_names & return errors
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 <mturquette@linaro.org>
diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index b1c4b02..5fc541d 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -153,6 +153,18 @@
};
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,
@@ -161,11 +173,11 @@
struct clk_divider *div;
struct clk *clk;
+ /* 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;
+ return ERR_PTR(-ENOMEM);
}
/* struct clk_divider assignments */
@@ -175,23 +187,15 @@
div->flags = clk_divider_flags;
div->lock = lock;
- if (parent_name) {
- div->parent[0] = kstrdup(parent_name, GFP_KERNEL);
- if (!div->parent[0])
- goto out;
- }
-
+ /* register the clock */
clk = clk_register(dev, name,
&clk_divider_ops, &div->hw,
- div->parent,
+ (parent_name ? &parent_name: NULL),
(parent_name ? 1 : 0),
flags);
- if (clk)
- return clk;
-out:
- kfree(div->parent[0]);
- kfree(div);
+ if (IS_ERR(clk))
+ kfree(div);
- return NULL;
+ return clk;
}
diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c
index 027e477..b555a04 100644
--- a/drivers/clk/clk-fixed-rate.c
+++ b/drivers/clk/clk-fixed-rate.c
@@ -38,16 +38,23 @@
};
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;
+ /* 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);
@@ -56,26 +63,15 @@
/* struct clk_fixed_rate assignments */
fixed->fixed_rate = fixed_rate;
- 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);
- }
-
-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_name : NULL),
(parent_name ? 1 : 0),
flags);
+
+ if (IS_ERR(clk))
+ kfree(fixed);
+
+ return clk;
}
diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
index fe2ff9e..42a4b94 100644
--- a/drivers/clk/clk-gate.c
+++ b/drivers/clk/clk-gate.c
@@ -105,6 +105,17 @@
};
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,
@@ -113,11 +124,11 @@
struct clk_gate *gate;
struct clk *clk;
+ /* 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;
+ return ERR_PTR(-ENOMEM);
}
/* struct clk_gate assignments */
@@ -126,22 +137,15 @@
gate->flags = clk_gate_flags;
gate->lock = lock;
- if (parent_name) {
- gate->parent[0] = kstrdup(parent_name, GFP_KERNEL);
- if (!gate->parent[0])
- goto out;
- }
-
+ /* register the clock */
clk = clk_register(dev, name,
&clk_gate_ops, &gate->hw,
- gate->parent,
+ (parent_name ? &parent_name : NULL),
(parent_name ? 1 : 0),
flags);
- if (clk)
- return clk;
-out:
- kfree(gate->parent[0]);
- kfree(gate);
- return NULL;
+ if (IS_ERR(clk))
+ kfree(gate);
+
+ return clk;
}
diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
index bd5e598..6e58f11 100644
--- a/drivers/clk/clk-mux.c
+++ b/drivers/clk/clk-mux.c
@@ -94,9 +94,10 @@
u8 clk_mux_flags, spinlock_t *lock)
{
struct clk_mux *mux;
+ struct clk *clk;
+ /* allocate the mux */
mux = kzalloc(sizeof(struct clk_mux), GFP_KERNEL);
-
if (!mux) {
pr_err("%s: could not allocate mux clk\n", __func__);
return ERR_PTR(-ENOMEM);
@@ -109,6 +110,11 @@
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;
}
