1 files changed, 4 insertions, 0 deletions

diff --git a/include/linux/pm.h b/include/linux/pm.h
index c2a55f94c29a..6035209cf31e 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -128,6 +128,9 @@ typedef int __bitwise suspend_disk_method_t;
  *      always valid and never passed to this call.
  *      If not assigned, all suspend states are advertised as valid
  *      in /sys/power/state (but can still be rejected by prepare or enter.)
+ *      Since new states can be added for other platforms, you should
+ *      assign this callback. There is a %pm_valid_only_mem function
+ *      available if you only implemented mem sleep.
  *
  * @prepare: Prepare the platform for the given suspend state. Can return a
  *      negative error code if necessary.
@@ -165,6 +168,7 @@ extern void pm_set_ops(struct pm_ops *pm_ops);
 extern struct pm_ops *pm_ops;
 extern int pm_suspend(suspend_state_t state);
 
+extern int pm_valid_only_mem(suspend_state_t state);
 
 /**
  * arch_suspend_disable_irqs - disable IRQs for suspend