state: provide dummy implementations for some functions when STATE is disabled

This allows to simplify some callers as can be seen from the
phytec-som-am335x/board.c change. (The check for state != NULL could be
dropped already before.)

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 36 insertions, 0 deletions

diff --git a/include/state.h b/include/state.h
index a49155ef27..d98b781c20 100644
--- a/include/state.h
+++ b/include/state.h
@@ -5,6 +5,7 @@
 
 struct state;
 
+#if IS_ENABLED(CONFIG_STATE)
 
 struct state *state_new_from_node(struct device_node *node, bool readonly);
 void state_release(struct state *state);
@@ -19,4 +20,39 @@ void state_info(void);
 
 int state_read_mac(struct state *state, const char *name, u8 *buf);
 
+#else /* #if IS_ENABLED(CONFIG_STATE) */
+
+static inline struct state *state_new_from_node(struct device_node *node,
+						bool readonly)
+{
+	return ERR_PTR(-ENOSYS);
+}
+
+static inline struct state *state_by_name(const char *name)
+{
+	return NULL;
+}
+
+static inline struct state *state_by_node(const struct device_node *node)
+{
+	return NULL;
+};
+
+static inline int state_load(struct state *state)
+{
+	return -ENOSYS;
+}
+
+static inline int state_save(struct state *state)
+{
+	return -ENOSYS;
+}
+
+static inline int state_read_mac(struct state *state, const char *name, u8 *buf)
+{
+	return -ENOSYS;
+}
+
+#endif /* #if IS_ENABLED(CONFIG_STATE) / #else */
+
 #endif /* __STATE_H */