net: dsa: Export suspend/resume functions

In preparation for allowing switch drivers to implement system-wide
suspend/resume functions, export dsa_switch_suspend and
dsa_switch_resume() such that these are callable from the appropriate
driver specific suspend/resume functions.

Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/dsa.h b/include/net/dsa.h
index 2217a3f..d00c392 100644
--- a/include/net/dsa.h
+++ b/include/net/dsa.h
@@ -386,4 +386,18 @@
 
 void dsa_unregister_switch(struct dsa_switch *ds);
 int dsa_register_switch(struct dsa_switch *ds, struct device_node *np);
+#ifdef CONFIG_PM_SLEEP
+int dsa_switch_suspend(struct dsa_switch *ds);
+int dsa_switch_resume(struct dsa_switch *ds);
+#else
+static inline int dsa_switch_suspend(struct dsa_switch *ds)
+{
+	return 0;
+}
+static inline int dsa_switch_resume(struct dsa_switch *ds)
+{
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
 #endif