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Subject[PATCH V3 1/6] PM / OPP: reuse of_parse_phandle()
Date
We already have a better API to get the opp descriptor block's node from
cpu-node. Lets reuse that instead of creating our own routines for the
same stuff. That cleans the code a lot.

This also kills a check we had earlier (as we are using the generic API
now). Earlier we used to check if the operating-points-v2 property
contained multiple phandles instead of a single phandle.

Killing this check isn't an issue because, we only parse the first entry
with of_parse_phandle(). So, if a user passes multiple phandles, its
really his problem :)

Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/base/power/opp.c | 71 ++++++++++++------------------------------------
1 file changed, 17 insertions(+), 54 deletions(-)

diff --git a/drivers/base/power/opp.c b/drivers/base/power/opp.c
index eb254497a494..4741fdc13e83 100644
--- a/drivers/base/power/opp.c
+++ b/drivers/base/power/opp.c
@@ -1253,69 +1253,33 @@ void of_cpumask_free_opp_table(cpumask_var_t cpumask)
}
EXPORT_SYMBOL_GPL(of_cpumask_free_opp_table);

-/* Returns opp descriptor node from its phandle. Caller must do of_node_put() */
-static struct device_node *
-_of_get_opp_desc_node_from_prop(struct device *dev, const struct property *prop)
-{
- struct device_node *opp_np;
-
- opp_np = of_find_node_by_phandle(be32_to_cpup(prop->value));
- if (!opp_np) {
- dev_err(dev, "%s: Prop: %s contains invalid opp desc phandle\n",
- __func__, prop->name);
- return ERR_PTR(-EINVAL);
- }
-
- return opp_np;
-}
-
-/* Returns opp descriptor node for a device. Caller must do of_node_put() */
+/* Returns opp descriptor node for a device, caller must do of_node_put() */
static struct device_node *_of_get_opp_desc_node(struct device *dev)
{
- const struct property *prop;
-
- prop = of_find_property(dev->of_node, "operating-points-v2", NULL);
- if (!prop)
- return ERR_PTR(-ENODEV);
- if (!prop->value)
- return ERR_PTR(-ENODATA);
-
/*
* TODO: Support for multiple OPP tables.
*
* There should be only ONE phandle present in "operating-points-v2"
* property.
*/
- if (prop->length != sizeof(__be32)) {
- dev_err(dev, "%s: Invalid opp desc phandle\n", __func__);
- return ERR_PTR(-EINVAL);
- }

- return _of_get_opp_desc_node_from_prop(dev, prop);
+ return of_parse_phandle(dev->of_node, "operating-points-v2", 0);
}

/* Initializes OPP tables based on new bindings */
static int _of_init_opp_table_v2(struct device *dev,
- const struct property *prop)
+ struct device_node *opp_np)
{
- struct device_node *opp_np, *np;
+ struct device_node *np;
struct device_opp *dev_opp;
int ret = 0, count = 0;

- if (!prop->value)
- return -ENODATA;
-
- /* Get opp node */
- opp_np = _of_get_opp_desc_node_from_prop(dev, prop);
- if (IS_ERR(opp_np))
- return PTR_ERR(opp_np);
-
dev_opp = _managed_opp(opp_np);
if (dev_opp) {
/* OPPs are already managed */
if (!_add_list_dev(dev, dev_opp))
ret = -ENOMEM;
- goto put_opp_np;
+ return ret;
}

/* We have opp-list node now, iterate over it and add OPPs */
@@ -1331,10 +1295,8 @@ static int _of_init_opp_table_v2(struct device *dev,
}

/* There should be one of more OPP defined */
- if (WARN_ON(!count)) {
- ret = -ENOENT;
- goto put_opp_np;
- }
+ if (WARN_ON(!count))
+ return -ENOENT;

dev_opp = _find_device_opp(dev);
if (WARN_ON(IS_ERR(dev_opp))) {
@@ -1345,13 +1307,10 @@ static int _of_init_opp_table_v2(struct device *dev,
dev_opp->np = opp_np;
dev_opp->shared_opp = of_property_read_bool(opp_np, "opp-shared");

- of_node_put(opp_np);
return 0;

free_table:
of_free_opp_table(dev);
-put_opp_np:
- of_node_put(opp_np);

return ret;
}
@@ -1418,14 +1377,15 @@ static int _of_init_opp_table_v1(struct device *dev)
*/
int of_init_opp_table(struct device *dev)
{
- const struct property *prop;
+ struct device_node *opp_np;
+ int ret;

/*
* OPPs have two version of bindings now. The older one is deprecated,
* try for the new binding first.
*/
- prop = of_find_property(dev->of_node, "operating-points-v2", NULL);
- if (!prop) {
+ opp_np = _of_get_opp_desc_node(dev);
+ if (!opp_np) {
/*
* Try old-deprecated bindings for backward compatibility with
* older dtbs.
@@ -1433,7 +1393,10 @@ int of_init_opp_table(struct device *dev)
return _of_init_opp_table_v1(dev);
}

- return _of_init_opp_table_v2(dev, prop);
+ ret = _of_init_opp_table_v2(dev, opp_np);
+ of_node_put(opp_np);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(of_init_opp_table);

@@ -1522,7 +1485,7 @@ int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)

/* Get OPP descriptor node */
np = _of_get_opp_desc_node(cpu_dev);
- if (IS_ERR(np)) {
+ if (!np) {
dev_dbg(cpu_dev, "%s: Couldn't find opp node: %ld\n", __func__,
PTR_ERR(np));
return -ENOENT;
@@ -1546,7 +1509,7 @@ int of_get_cpus_sharing_opps(struct device *cpu_dev, cpumask_var_t cpumask)

/* Get OPP descriptor node */
tmp_np = _of_get_opp_desc_node(tcpu_dev);
- if (IS_ERR(tmp_np)) {
+ if (!tmp_np) {
dev_err(tcpu_dev, "%s: Couldn't find opp node: %ld\n",
__func__, PTR_ERR(tmp_np));
ret = PTR_ERR(tmp_np);
--
2.4.0


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