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Subject[PATCH 04/11] OPP: Parse OPP table's DT properties from _of_init_opp_table()
Date
Parse the DT properties present in the OPP table from
_of_init_opp_table(), which is a dedicated routine for DT parsing.

Minor relocation of helpers is required for this.

It is possible now for _managed_opp() to return a partially initialized
OPP table if the OPP table is created via the helpers like
dev_pm_opp_set_supported_hw() and we need another flag to indicate if
the static OPP are already parsed or not to make sure we don't
incorrectly skip initializing the static OPPs.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
---
drivers/opp/of.c | 79 ++++++++++++++++++++++++++++-------------------
drivers/opp/opp.h | 2 ++
2 files changed, 50 insertions(+), 31 deletions(-)

diff --git a/drivers/opp/of.c b/drivers/opp/of.c
index a91857d163b2..ebf467b4d99e 100644
--- a/drivers/opp/of.c
+++ b/drivers/opp/of.c
@@ -23,6 +23,24 @@

#include "opp.h"

+/*
+ * Returns opp descriptor node for a device node, caller must
+ * do of_node_put().
+ */
+static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np,
+ int index)
+{
+ /* "operating-points-v2" can be an array for power domain providers */
+ return of_parse_phandle(np, "operating-points-v2", index);
+}
+
+/* Returns opp descriptor node for a device, caller must do of_node_put() */
+struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
+{
+ return _opp_of_get_opp_desc_node(dev->of_node, 0);
+}
+EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
+
static struct opp_table *_managed_opp(const struct device_node *np)
{
struct opp_table *opp_table, *managed_table = NULL;
@@ -55,22 +73,37 @@ static struct opp_table *_managed_opp(const struct device_node *np)
void _of_init_opp_table(struct opp_table *opp_table, struct device *dev,
int index)
{
- struct device_node *np;
+ struct device_node *np, *opp_np;
+ u32 val;

/*
* Only required for backward compatibility with v1 bindings, but isn't
* harmful for other cases. And so we do it unconditionally.
*/
np = of_node_get(dev->of_node);
- if (np) {
- u32 val;
-
- if (!of_property_read_u32(np, "clock-latency", &val))
- opp_table->clock_latency_ns_max = val;
- of_property_read_u32(np, "voltage-tolerance",
- &opp_table->voltage_tolerance_v1);
- of_node_put(np);
- }
+ if (!np)
+ return;
+
+ if (!of_property_read_u32(np, "clock-latency", &val))
+ opp_table->clock_latency_ns_max = val;
+ of_property_read_u32(np, "voltage-tolerance",
+ &opp_table->voltage_tolerance_v1);
+
+ /* Get OPP table node */
+ opp_np = _opp_of_get_opp_desc_node(np, index);
+ of_node_put(np);
+
+ if (!opp_np)
+ return;
+
+ if (of_property_read_bool(opp_np, "opp-shared"))
+ opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
+ else
+ opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
+
+ opp_table->np = opp_np;
+
+ of_node_put(opp_np);
}

static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
@@ -250,22 +283,6 @@ void dev_pm_opp_of_remove_table(struct device *dev)
}
EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);

-/* Returns opp descriptor node for a device node, caller must
- * do of_node_put() */
-static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np,
- int index)
-{
- /* "operating-points-v2" can be an array for power domain providers */
- return of_parse_phandle(np, "operating-points-v2", index);
-}
-
-/* Returns opp descriptor node for a device, caller must do of_node_put() */
-struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
-{
- return _opp_of_get_opp_desc_node(dev->of_node, 0);
-}
-EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
-
/**
* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
* @opp_table: OPP table
@@ -392,6 +409,9 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np,
/* OPPs are already managed */
if (!_add_opp_dev(dev, opp_table))
ret = -ENOMEM;
+ else if (!opp_table->parsed_static_opps)
+ goto initialize_static_opps;
+
goto put_opp_table;
}

@@ -399,6 +419,7 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np,
if (!opp_table)
return -ENOMEM;

+initialize_static_opps:
/* We have opp-table node now, iterate over it and add OPPs */
for_each_available_child_of_node(opp_np, np) {
count++;
@@ -434,11 +455,7 @@ static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np,
if (pstate_count)
opp_table->genpd_performance_state = true;

- opp_table->np = opp_np;
- if (of_property_read_bool(opp_np, "opp-shared"))
- opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
- else
- opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
+ opp_table->parsed_static_opps = true;

put_opp_table:
dev_pm_opp_put_opp_table(opp_table);
diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h
index 84aba19531b8..d218fc0a498d 100644
--- a/drivers/opp/opp.h
+++ b/drivers/opp/opp.h
@@ -129,6 +129,7 @@ enum opp_table_access {
* @lock: mutex protecting the opp_list and dev_list.
* @np: struct device_node pointer for opp's DT node.
* @clock_latency_ns_max: Max clock latency in nanoseconds.
+ * @parsed_static_opps: True if OPPs are initialized from DT.
* @shared_opp: OPP is shared between multiple devices.
* @suspend_opp: Pointer to OPP to be used during device suspend.
* @supported_hw: Array of version number to support.
@@ -164,6 +165,7 @@ struct opp_table {
/* For backward compatibility with v1 bindings */
unsigned int voltage_tolerance_v1;

+ bool parsed_static_opps;
enum opp_table_access shared_opp;
struct dev_pm_opp *suspend_opp;

--
2.18.0.rc1.242.g61856ae69a2c
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