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Message-ID: <1334192572-12499-14-git-send-email-mturquette@linaro.org>
Date: Wed, 11 Apr 2012 18:02:51 -0700
From: Mike Turquette <mturquette@...aro.org>
To: <arnd.bergmann@...aro.org>
CC: <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linaro-dev@...ts.linaro.org>, <patches@...aro.org>,
Mike Turquette <mturquette@...aro.org>,
Olof Johansson <olof@...om.net>,
Russell King <linux@....linux.org.uk>,
Sascha Hauer <s.hauer@...gutronix.de>,
Shawn Guo <shawn.guo@...escale.com>,
Richard Zhao <richard.zhao@...aro.org>,
Saravana Kannan <skannan@...eaurora.org>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Andrew Lunn <andrew@...n.ch>, Rajendra Nayak <rnayak@...com>,
Viresh Kumar <viresh.kumar@...com>
Subject: [PATCH 13/13] 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@...aro.org>
Cc: Arnd Bergman <arnd.bergmann@...aro.org>
Cc: Olof Johansson <olof@...om.net>
Cc: Russell King <linux@....linux.org.uk>
Cc: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Shawn Guo <shawn.guo@...escale.com>
Cc: Richard Zhao <richard.zhao@...aro.org>
Cc: Saravana Kannan <skannan@...eaurora.org>
Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
Cc: Andrew Lunn <andrew@...n.ch>
Cc: Rajendra Nayak <rnayak@...com>
Cc: Viresh Kumar <viresh.kumar@...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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