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Subject[PATCH 08/16] PM / OPP: get/put regulators from OPP core
Date
When the 'supply_names' property is present, the OPP core can request
regulators for them. All the regulators from the 'supply_names' property
must be present, in order to move forward.

If an error occurs, undo all allocations and return the appropriate
error. This also helps in returning error on -EPROBE_DEFER case, where
the driver must try again at a later point of time.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/base/power/opp/core.c | 30 +++++++++++++++++++++++++++---
drivers/base/power/opp/opp.h | 3 +++
2 files changed, 30 insertions(+), 3 deletions(-)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c
index d6e945ec6467..42ea5a332ddc 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -509,8 +509,10 @@ static struct device_opp *_add_device_opp(struct device *dev, int supply_count)
if (!IS_ERR(dev_opp))
return dev_opp;

- /* Allocate size for supply-names with dev_opp */
- size = sizeof(*dev_opp) + supply_count * sizeof(*dev_opp->supply_names);
+ /* Allocate memory for supply-names & regulators with dev_opp */
+ size = sizeof(*dev_opp);
+ size += supply_count * sizeof(*dev_opp->supply_names);
+ size += supply_count * sizeof(*dev_opp->regulators);

/*
* Allocate a new device OPP table. In the infrequent case where a new
@@ -521,7 +523,8 @@ static struct device_opp *_add_device_opp(struct device *dev, int supply_count)
return NULL;

dev_opp->supply_count = supply_count;
- dev_opp->supply_names = (const char **)(dev_opp + 1);
+ dev_opp->regulators = (struct regulator **)(dev_opp + 1);
+ dev_opp->supply_names = (const char **)(dev_opp->regulators + supply_count);

INIT_LIST_HEAD(&dev_opp->dev_list);

@@ -566,10 +569,15 @@ static void _kfree_device_rcu(struct rcu_head *head)
static void _remove_device_opp(struct device_opp *dev_opp)
{
struct device_list_opp *list_dev;
+ int count;

if (!list_empty(&dev_opp->opp_list))
return;

+ /* Release regulators */
+ for (count = dev_opp->supply_count - 1; count >= 0; count--)
+ regulator_put(dev_opp->regulators[count]);
+
list_dev = list_first_entry(&dev_opp->dev_list, struct device_list_opp,
node);

@@ -1293,6 +1301,7 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
const char **name;
int ret = 0, count, supply_count, string_count;
bool triplets;
+ struct regulator *reg;

dev_opp = _managed_opp(opp_np);
if (dev_opp) {
@@ -1334,6 +1343,21 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
}
}

+ /* Get supply regulators */
+ name = dev_opp->supply_names;
+ for (count = 0; count < supply_count; count++, name++) {
+ /* Parse regulators */
+ reg = regulator_get_optional(dev, *name);
+ if (IS_ERR(reg)) {
+ ret = PTR_ERR(reg);
+ if (ret != -EPROBE_DEFER)
+ dev_err(dev, "%s: no regulator (%s) found: %d\n",
+ __func__, *name, ret);
+ goto free_table;
+ }
+ dev_opp->regulators[count] = reg;
+ }
+
/* We have opp-list node now, iterate over it and add OPPs */
count = 0;
for_each_available_child_of_node(opp_np, np) {
diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h
index 16575268f6ce..830c4b654a51 100644
--- a/drivers/base/power/opp/opp.h
+++ b/drivers/base/power/opp/opp.h
@@ -19,6 +19,7 @@
#include <linux/list.h>
#include <linux/limits.h>
#include <linux/pm_opp.h>
+#include <linux/regulator/consumer.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>

@@ -135,6 +136,7 @@ struct device_list_opp {
* @opp_list: list of opps
* @np: struct device_node pointer for opp's DT node.
* @supply_count: Number of power-supplies
+ * @regulators: Array of regulators
* @supply_names: Array of strings containing names of the power-supplies
* @shared_opp: OPP is shared between multiple devices.
* @dentry: debugfs dentry pointer of the real device directory (not links).
@@ -160,6 +162,7 @@ struct device_opp {
unsigned long clock_latency_ns_max;

unsigned int supply_count;
+ struct regulator **regulators;
const char **supply_names;

bool shared_opp;
--
2.4.0


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