Merge branch 'phy-mdio-split'

Florian Fainelli says:

====================
net: phy: Allow splitting MDIO bus/device support

This patch series allows building support for MDIO bus controllers which
are sometimes usable and necessary in cases where there are no Ethernet PHYs.

Changes in v3:
- corrected of_mdio compile guards for prototypes vs. stubs
- added a missing OF_MDIO dependency for MDIO_BCM_UNIMAC
- fixed Kbuild bot reported errors against mdio-bitbang

Changes in v2:
- implement Russell's feedback
- solve the circular dependency in the CONFIG_MDIO_DEVICE + CONFIG_PHYLIB case
====================

Signed-off-by: David S. Miller <[e-mail]>

drivers/net/Makefile

···
 obj-$(CONFIG_MDIO) += mdio.o
 obj-$(CONFIG_NET) += Space.o loopback.o
 obj-$(CONFIG_NETCONSOLE) += netconsole.o
-obj-$(CONFIG_PHYLIB) += phy/
+obj-$(CONFIG_MDIO_DEVICE) += phy/
 obj-$(CONFIG_RIONET) += rionet.o
 obj-$(CONFIG_NET_TEAM) += team/
 obj-$(CONFIG_TUN) += tun.o

drivers/net/phy/Kconfig

···
 # PHY Layer Configuration
 #
 
-menuconfig PHYLIB
-	tristate "PHY Device support and infrastructure"
-	depends on NETDEVICES
+menuconfig MDIO_DEVICE
+	tristate "MDIO bus device drivers"
 	help
-	  Ethernet controllers are usually attached to PHY
-	  devices.  This option provides infrastructure for
-	  managing PHY devices.
+	   MDIO devices and driver infrastructure code.
 
-if PHYLIB
-
-config SWPHY
-	bool
-
-config LED_TRIGGER_PHY
-	bool "Support LED triggers for tracking link state"
-	depends on LEDS_TRIGGERS
-	---help---
-	  Adds support for a set of LED trigger events per-PHY.  Link
-	  state change will trigger the events, for consumption by an
-	  LED class driver.  There are triggers for each link speed currently
-	  supported by the phy, and are of the form:
-	       <mii bus id>:<phy>:<speed>
-
-	  Where speed is in the form:
-		<Speed in megabits>Mbps or <Speed in gigabits>Gbps
-
-comment "MDIO bus device drivers"
+if MDIO_DEVICE
 
 config MDIO_BCM_IPROC
 	tristate "Broadcom iProc MDIO bus controller"
···
 
 config MDIO_BCM_UNIMAC
 	tristate "Broadcom UniMAC MDIO bus controller"
-	depends on HAS_IOMEM
+	depends on HAS_IOMEM && OF_MDIO
 	help
 	  This module provides a driver for the Broadcom UniMAC MDIO busses.
 	  This hardware can be found in the Broadcom GENET Ethernet MAC
···
 
 config MDIO_BITBANG
 	tristate "Bitbanged MDIO buses"
+	depends on !(MDIO_DEVICE=y && PHYLIB=m)
 	help
 	  This module implements the MDIO bus protocol in software,
 	  for use by low level drivers that export the ability to
···
 	help
 	  This module provides a driver for the MDIO busses found in the
 	  APM X-Gene SoC's.
+
+endif
+
+menuconfig PHYLIB
+	tristate "PHY Device support and infrastructure"
+	depends on NETDEVICES
+	select MDIO_DEVICE
+	help
+	  Ethernet controllers are usually attached to PHY
+	  devices.  This option provides infrastructure for
+	  managing PHY devices.
+
+if PHYLIB
+
+config SWPHY
+	bool
+
+config LED_TRIGGER_PHY
+	bool "Support LED triggers for tracking link state"
+	depends on LEDS_TRIGGERS
+	---help---
+	  Adds support for a set of LED trigger events per-PHY.  Link
+	  state change will trigger the events, for consumption by an
+	  LED class driver.  There are triggers for each link speed currently
+	  supported by the phy, and are of the form:
+	       <mii bus id>:<phy>:<speed>
+
+	  Where speed is in the form:
+		<Speed in megabits>Mbps or <Speed in gigabits>Gbps
+
 
 comment "MII PHY device drivers"
 

drivers/net/phy/Makefile

···
 # Makefile for Linux PHY drivers and MDIO bus drivers
 
-libphy-y			:= phy.o phy_device.o mdio_bus.o mdio_device.o \
-				   mdio-boardinfo.o phy-core.o
+libphy-y			:= phy.o phy-core.o phy_device.o
+mdio-bus-y			+= mdio_bus.o mdio_device.o mdio-boardinfo.o
+
+# PHYLIB implies MDIO_DEVICE, in that case, we have a bunch of circular
+# dependencies that does not make it possible to split mdio-bus objects into a
+# dedicated loadable module, so we bundle them all together into libphy.ko
+ifdef CONFIG_PHYLIB
+libphy-y			+= $(mdio-bus-y)
+else
+obj-$(CONFIG_MDIO_DEVICE)	+= mdio-bus.o
+endif
 libphy-$(CONFIG_SWPHY)		+= swphy.o
 libphy-$(CONFIG_LED_TRIGGER_PHY)	+= phy_led_triggers.o
 

drivers/net/phy/mdio-boardinfo.c

···
 
 	return 0;
 }
+EXPORT_SYMBOL(mdiobus_register_board_info);

drivers/net/phy/mdio_bus.c

···
 
 	return ret;
 }
+EXPORT_SYMBOL_GPL(mdio_bus_init);
 
+#if IS_ENABLED(CONFIG_PHYLIB)
 void mdio_bus_exit(void)
 {
 	class_unregister(&mdio_bus_class);
 	bus_unregister(&mdio_bus_type);
 }
+EXPORT_SYMBOL_GPL(mdio_bus_exit);
+#else
+module_init(mdio_bus_init);
+/* no module_exit, intentional */
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("MDIO bus/device layer");
+#endif

include/linux/of_mdio.h

···
 #include <linux/phy.h>
 #include <linux/of.h>
 
-#ifdef CONFIG_OF
+#if IS_ENABLED(CONFIG_OF_MDIO)
 extern int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np);
 extern struct phy_device *of_phy_find_device(struct device_node *phy_np);
 extern struct phy_device *of_phy_connect(struct net_device *dev,
···
 extern void of_phy_deregister_fixed_link(struct device_node *np);
 extern bool of_phy_is_fixed_link(struct device_node *np);
 
-#else /* CONFIG_OF */
+#else /* CONFIG_OF_MDIO */
 static inline int of_mdiobus_register(struct mii_bus *mdio, struct device_node *np)
 {
 	/*

include/linux/phy.h

···
 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 				     bool is_c45,
 				     struct phy_c45_device_ids *c45_ids);
+#if IS_ENABLED(CONFIG_PHYLIB)
 struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45);
 int phy_device_register(struct phy_device *phy);
+void phy_device_free(struct phy_device *phydev);
+#else
+static inline
+struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
+{
+	return NULL;
+}
+
+static inline int phy_device_register(struct phy_device *phy)
+{
+	return 0;
+}
+
+static inline void phy_device_free(struct phy_device *phydev) { }
+#endif /* CONFIG_PHYLIB */
 void phy_device_remove(struct phy_device *phydev);
 int phy_init_hw(struct phy_device *phydev);
 int phy_suspend(struct phy_device *phydev);
···
 int phy_mii_ioctl(struct phy_device *phydev, struct ifreq *ifr, int cmd);
 int phy_start_interrupts(struct phy_device *phydev);
 void phy_print_status(struct phy_device *phydev);
-void phy_device_free(struct phy_device *phydev);
 int phy_set_max_speed(struct phy_device *phydev, u32 max_speed);
 
 int phy_register_fixup(const char *bus_id, u32 phy_uid, u32 phy_uid_mask,
···
 				   const struct ethtool_link_ksettings *cmd);
 int phy_ethtool_nway_reset(struct net_device *ndev);
 
+#if IS_ENABLED(CONFIG_PHYLIB)
 int __init mdio_bus_init(void);
 void mdio_bus_exit(void);
+#endif
 
 extern struct bus_type mdio_bus_type;
 
···
 	const void	*platform_data;
 };
 
-#if IS_ENABLED(CONFIG_PHYLIB)
+#if IS_ENABLED(CONFIG_MDIO_DEVICE)
 int mdiobus_register_board_info(const struct mdio_board_info *info,
 				unsigned int n);
 #else