linux-kernel - [PATCH 13/16] PM / OPP: Manage device clk as well

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Date:	Fri, 11 Sep 2015 17:32:09 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Rafael Wysocki <rjw@...ysocki.net>, nm@...com, sboyd@...eaurora.org
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	rob.herring@...aro.org, lee.jones@...aro.org,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Dmitry Torokhov <dtor@...omium.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Len Brown <len.brown@...el.com>,
	linux-kernel@...r.kernel.org (open list),
	Pavel Machek <pavel@....cz>
Subject: [PATCH 13/16] PM / OPP: Manage device clk as well

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@...aro.org>
---
 drivers/base/power/opp/core.c | 9 +++++++++
 drivers/base/power/opp/opp.h  | 3 +++
 2 files changed, 12 insertions(+)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index 9633f2fc3481..a04dcacb8a07 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -636,6 +636,11 @@ static struct device_opp *_add_device_opp(struct device *dev, int supply_count,
 	if (supply_count == 1)
 		*dev_opp->supply_names = dev_name(dev);
 
+	/* Find clk for the device */
+	dev_opp->clk = clk_get(dev, NULL);
+	if (IS_ERR(dev_opp->clk))
+		dev_dbg(dev, "%s: Couldn't find clock\n", __func__);
+
 	srcu_init_notifier_head(&dev_opp->srcu_head);
 	INIT_LIST_HEAD(&dev_opp->opp_list);
 
@@ -669,6 +674,10 @@ static void _remove_device_opp(struct device_opp *dev_opp)
 	if (!list_empty(&dev_opp->opp_list))
 		return;
 
+	/* Release clk */
+	if (!IS_ERR(dev_opp->clk))
+		clk_put(dev_opp->clk);
+
 	/* Release regulators */
 	for (count = dev_opp->supply_count - 1; count >= 0; count--)
 		regulator_put(dev_opp->regulators[count]);
diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h
index 55205cbe59dc..e36ee6296f1a 100644
--- a/drivers/base/power/opp/opp.h
+++ b/drivers/base/power/opp/opp.h
@@ -14,6 +14,7 @@
 #ifndef __DRIVER_OPP_H__
 #define __DRIVER_OPP_H__
 
+#include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
@@ -135,6 +136,7 @@ struct device_list_opp {
  * @dev_list:	list of devices that share these OPPs
  * @opp_list:	list of opps
  * @np:		struct device_node pointer for opp's DT node.
+ * @clk:	struct clk pointer
  * @supply_count: Number of power-supplies
  * @regulators:	Array of regulators
  * @supply_names: Array of strings containing names of the power-supplies
@@ -163,6 +165,7 @@ struct device_opp {
 	struct device_node *np;
 	unsigned long clock_latency_ns_max;
 
+	struct clk *clk;
 	unsigned int supply_count;
 	struct regulator **regulators;
 	const char **supply_names;
-- 
2.4.0

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