Now that we have atleast 2 genpd providers, both using a simple routine to read a performance state (opp-level) value from device tree, in order to implement the .opp_to_performance_state callback, add a dev_pm_opp_of_get_level() helper to do it, so it can be resued across all such genpd providers which just need to read the value from DT.
Suggested-by: Stephen Boyd <[email protected]> Signed-off-by: Rajendra Nayak <[email protected]> --- drivers/opp/of.c | 23 +++++++++++++++++++++++ include/linux/pm_opp.h | 5 +++++ 2 files changed, 28 insertions(+) diff --git a/drivers/opp/of.c b/drivers/opp/of.c index 06f0f632ec47..6fb383fee601 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -1029,6 +1029,29 @@ 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_get_level() - Reads the opp-level value from Device Tree + * @opp: opp for which 'opp-level' should be read and returned + * + * Returns the opp-level value read from Device Tree, if present, else 0 + * + * Return: Zero or positive opp-level value read from Device tree + */ +unsigned int dev_pm_opp_of_get_level(struct dev_pm_opp *opp) +{ + struct device_node *np; + unsigned int perf_state = 0; + + np = dev_pm_opp_get_of_node(opp); + if (of_property_read_u32(np, "opp-level", &perf_state)) + pr_err("%s: missing 'opp-level' property\n", __func__); + + of_node_put(np); + + return perf_state; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_level); + /** * 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 diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index 0a2a88e5a383..bf7d21b23a5e 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -322,6 +322,7 @@ 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); +unsigned int dev_pm_opp_of_get_level(struct dev_pm_opp *opp); #else static inline int dev_pm_opp_of_add_table(struct device *dev) { @@ -364,6 +365,10 @@ static inline int of_get_required_opp_performance_state(struct device_node *np, { return -ENOTSUPP; } +static inline int dev_pm_opp_of_get_level(struct dev_pm_opp *opp) +{ + return 0; +} #endif #endif /* __LINUX_OPP_H__ */ -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
