Commit e3943f00 authored by Ulf Hansson's avatar Ulf Hansson Committed by Viresh Kumar
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OPP: Introduce an OF helper function to inform if required-opps is used 



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: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
parent 0d865221

drivers/opp/of.c

+32 −0
Original line number Diff line number Diff line
@@ -1443,6 +1443,38 @@ int of_get_required_opp_performance_state(struct device_node *np, int index) 
}

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

include/linux/pm_opp.h

+6 −0
Original line number Diff line number Diff line
@@ -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;