Merge tag 'opp-updates-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm

Merge OPP (operating performance points) updates for 6.18 from Viresh
Kumar:

"- Add support to find OPP for a set of keys (Krishna Chaitanya Chundru).

 - Minor optimization to OPP Rust implementation (Onur Özkan)."

* tag 'opp-updates-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm:
  OPP: Add support to find OPP for a set of keys
  rust: opp: use to_result for error handling

1 files changed, 30 insertions, 0 deletions

diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h
index cf477beae4bb..789406d95e69 100644
--- a/include/linux/pm_opp.h
+++ b/include/linux/pm_opp.h
@@ -98,6 +98,25 @@ struct dev_pm_opp_data {
 	unsigned long u_volt;
 };
 
+/**
+ * struct dev_pm_opp_key - Key used to identify OPP entries
+ * @freq:       Frequency in Hz. Use 0 if frequency is not to be matched.
+ * @level:      Performance level associated with the OPP entry.
+ *              Use OPP_LEVEL_UNSET if level is not to be matched.
+ * @bw:         Bandwidth associated with the OPP entry.
+ *              Use 0 if bandwidth is not to be matched.
+ *
+ * This structure is used to uniquely identify an OPP entry based on
+ * frequency, performance level, and bandwidth. Each field can be
+ * selectively ignored during matching by setting it to its respective
+ * NOP value.
+ */
+struct dev_pm_opp_key {
+	unsigned long freq;
+	unsigned int level;
+	u32 bw;
+};
+
 #if defined(CONFIG_PM_OPP)
 
 struct opp_table *dev_pm_opp_get_opp_table(struct device *dev);
@@ -131,6 +150,10 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
 					      unsigned long freq,
 					      bool available);
 
+struct dev_pm_opp *dev_pm_opp_find_key_exact(struct device *dev,
+					     struct dev_pm_opp_key *key,
+					     bool available);
+
 struct dev_pm_opp *
 dev_pm_opp_find_freq_exact_indexed(struct device *dev, unsigned long freq,
 				   u32 index, bool available);
@@ -289,6 +312,13 @@ static inline struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev,
 	return ERR_PTR(-EOPNOTSUPP);
 }
 
+static inline struct dev_pm_opp *dev_pm_opp_find_key_exact(struct device *dev,
+							   struct dev_pm_opp_key *key,
+							   bool available)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
 static inline struct dev_pm_opp *
 dev_pm_opp_find_freq_exact_indexed(struct device *dev, unsigned long freq,
 				   u32 index, bool available)