net: sfp: provide sfp_get_module_caps()

Provide a function to retrieve the current sfp_module_caps structure
so that upstreams can get the entire module support in one go.

Signed-off-by: Russell King (Oracle) <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/phy/sfp-bus.c

···
 	struct sfp_module_caps caps;
 };
 
+const struct sfp_module_caps *sfp_get_module_caps(struct sfp_bus *bus)
+{
+	return &bus->caps;
+}
+EXPORT_SYMBOL_GPL(sfp_get_module_caps);
+
 /**
  * sfp_parse_port() - Parse the EEPROM base ID, setting the port type
  * @bus: a pointer to the &struct sfp_bus structure for the sfp module

include/linux/sfp.h

···
 };
 
 #if IS_ENABLED(CONFIG_SFP)
+const struct sfp_module_caps *sfp_get_module_caps(struct sfp_bus *bus);
 int sfp_parse_port(struct sfp_bus *bus, const struct sfp_eeprom_id *id,
 		   unsigned long *support);
 bool sfp_may_have_phy(struct sfp_bus *bus, const struct sfp_eeprom_id *id);
···
 void sfp_bus_del_upstream(struct sfp_bus *bus);
 const char *sfp_get_name(struct sfp_bus *bus);
 #else
+static inline const struct sfp_module_caps *
+sfp_get_module_caps(struct sfp_bus *bus)
+{
+	return NULL;
+}
+
 static inline int sfp_parse_port(struct sfp_bus *bus,
 				 const struct sfp_eeprom_id *id,
 				 unsigned long *support)