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Subject[PATCH V3 06/16] PM / OPP: Manage device clk
Date
OPP core has got almost everything now to manage device's OPP
transitions, the only thing left is device's clk. Get that as well.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
---
drivers/base/power/opp/core.c | 15 +++++++++++++++
drivers/base/power/opp/opp.h | 3 +++
2 files changed, 18 insertions(+)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index 4fafa733a1c7..7d7749ce1ce4 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -13,6 +13,7 @@

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

+#include <linux/clk.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/slab.h>
@@ -583,6 +584,7 @@ static struct device_opp *_add_device_opp(struct device *dev)
struct device_opp *dev_opp;
struct device_list_opp *list_dev;
struct device_node *np;
+ int ret;

/* Check for existing list for 'dev' first */
dev_opp = _find_device_opp(dev);
@@ -620,6 +622,15 @@ static struct device_opp *_add_device_opp(struct device *dev)
of_node_put(np);
}

+ /* Find clk for the device */
+ dev_opp->clk = clk_get(dev, NULL);
+ if (IS_ERR(dev_opp->clk)) {
+ ret = PTR_ERR(dev_opp->clk);
+ if (ret != -EPROBE_DEFER)
+ dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__,
+ ret);
+ }
+
srcu_init_notifier_head(&dev_opp->srcu_head);
INIT_LIST_HEAD(&dev_opp->opp_list);

@@ -661,6 +672,10 @@ static void _remove_device_opp(struct device_opp *dev_opp)
if (!IS_ERR_OR_NULL(dev_opp->regulator))
return;

+ /* Release clk */
+ if (!IS_ERR(dev_opp->clk))
+ clk_put(dev_opp->clk);
+
list_dev = list_first_entry(&dev_opp->dev_list, struct device_list_opp,
node);

diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h
index fe44beb404ba..4f1bdfc7da03 100644
--- a/drivers/base/power/opp/opp.h
+++ b/drivers/base/power/opp/opp.h
@@ -22,6 +22,7 @@
#include <linux/rculist.h>
#include <linux/rcupdate.h>

+struct clk;
struct regulator;

/* Lock to allow exclusive modification to the device and opp lists */
@@ -134,6 +135,7 @@ struct device_list_opp {
* @supported_hw: Array of version number to support.
* @supported_hw_count: Number of elements in supported_hw array.
* @prop_name: A name to postfix to many DT properties, while parsing them.
+ * @clk: Device's clock handle
* @regulator: Supply regulator
* @dentry: debugfs dentry pointer of the real device directory (not links).
* @dentry_name: Name of the real dentry.
@@ -168,6 +170,7 @@ struct device_opp {
unsigned int *supported_hw;
unsigned int supported_hw_count;
const char *prop_name;
+ struct clk *clk;
struct regulator *regulator;

#ifdef CONFIG_DEBUG_FS
--
2.7.1.370.gb2aa7f8
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