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OPP: Introduce an OF helper function to inform if required-opps is used

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As being shown from a subsequent change to genpd, it's useful to understand
if a device's OF node has an OPP-table described and whether it contains
OPP nodes that makes use of the required-opps DT property.

For this reason, let's introduce an OPP OF helper function called
dev_pm_opp_of_has_required_opp().

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Ulf Hansson 2024-06-19 16:08:46 +02:00 committed by Viresh Kumar
parent 0d865221c8
commit e3943f00af
2 changed files with 38 additions and 0 deletions
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32
drivers/opp/of.c
View File

@ -1443,6 +1443,38 @@ put_required_np:
}
EXPORT_SYMBOL_GPL(of_get_required_opp_performance_state);
/**
* dev_pm_opp_of_has_required_opp - Find out if a required-opps exists.
* @dev: The device to investigate.
*
* Returns true if the device's node has a "operating-points-v2" property and if
* the corresponding node for the opp-table describes opp nodes that uses the
* "required-opps" property.
*
* Return: True if a required-opps is present, else false.
*/
bool dev_pm_opp_of_has_required_opp(struct device *dev)
{
struct device_node *opp_np, *np;
int count;
opp_np = _opp_of_get_opp_desc_node(dev->of_node, 0);
if (!opp_np)
return false;
np = of_get_next_available_child(opp_np, NULL);
of_node_put(opp_np);
if (!np) {
dev_warn(dev, "Empty OPP table\n");
return false;
}
count = of_count_phandle_with_args(np, "required-opps", NULL);
of_node_put(np);
return count > 0;
}
/**
* dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp
* @opp: opp for which DT node has to be returned for

6
include/linux/pm_opp.h
View File

@ -474,6 +474,7 @@ int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpuma
struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev);
struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp);
int of_get_required_opp_performance_state(struct device_node *np, int index);
bool dev_pm_opp_of_has_required_opp(struct device *dev);
int dev_pm_opp_of_find_icc_paths(struct device *dev, struct opp_table *opp_table);
int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus);
int dev_pm_opp_calc_power(struct device *dev, unsigned long *uW,
@ -552,6 +553,11 @@ static inline int of_get_required_opp_performance_state(struct device_node *np,
return -EOPNOTSUPP;
}
static inline bool dev_pm_opp_of_has_required_opp(struct device *dev)
{
return false;
}
static inline int dev_pm_opp_of_find_icc_paths(struct device *dev, struct opp_table *opp_table)
{
return -EOPNOTSUPP;