PM / devfreq: Add new passive governor

[cascardo/linux.git] / include / linux / devfreq.h

diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index 98c6993..2de4e2e 100644 (file)
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -272,6 +272,39 @@ struct devfreq_simple_ondemand_data {
 };
 #endif
 
+#if IS_ENABLED(CONFIG_DEVFREQ_GOV_PASSIVE)
+/**
+ * struct devfreq_passive_data - void *data fed to struct devfreq
+ *     and devfreq_add_device
+ * @parent:    the devfreq instance of parent device.
+ * @get_target_freq:   Optional callback, Returns desired operating frequency
+ *                     for the device using passive governor. That is called
+ *                     when passive governor should decide the next frequency
+ *                     by using the new frequency of parent devfreq device
+ *                     using governors except for passive governor.
+ *                     If the devfreq device has the specific method to decide
+ *                     the next frequency, should use this callback.
+ * @this:      the devfreq instance of own device.
+ * @nb:                the notifier block for DEVFREQ_TRANSITION_NOTIFIER list
+ *
+ * The devfreq_passive_data have to set the devfreq instance of parent
+ * device with governors except for the passive governor. But, don't need to
+ * initialize the 'this' and 'nb' field because the devfreq core will handle
+ * them.
+ */
+struct devfreq_passive_data {
+       /* Should set the devfreq instance of parent device */
+       struct devfreq *parent;
+
+       /* Optional callback to decide the next frequency of passvice device */
+       int (*get_target_freq)(struct devfreq *this, unsigned long *freq);
+
+       /* For passive governor's internal use. Don't need to set them */
+       struct devfreq *this;
+       struct notifier_block nb;
+};
+#endif
+
 #else /* !CONFIG_PM_DEVFREQ */
 static inline struct devfreq *devfreq_add_device(struct device *dev,
                                          struct devfreq_dev_profile *profile,