net: miiphybb: Introduce bb_miiphy_alloc()/bb_miiphy_free() wrappers

Introduce bb_miiphy_alloc()/bb_miiphy_free() wrappers to allocate and free
struct bb_miiphy_bus. Make struct bb_miiphy_bus wrap struct mii_dev, which
will become useful later in bb_miiphy_bus accessors, which would be able
to access struct bb_miiphy_bus using container_of, even if the PHY stack
only passes in the inner struct mii_dev .

Reviewed-by: Paul Barker <paul.barker.ct@bp.renesas.com>
Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

drivers/net/phy/miiphybb.c

@@ -14,6 +14,7 @@
 
 #include <ioports.h>
 #include <ppc_asm.tmpl>
+#include <malloc.h>
 #include <miiphy.h>
 #include <asm/global_data.h>
 
@@ -30,6 +31,24 @@ static inline struct bb_miiphy_bus *bb_miiphy_getbus(const char *devname)
 	return NULL;
 }
 
+struct bb_miiphy_bus *bb_miiphy_alloc(void)
+{
+	struct bb_miiphy_bus *bus;
+
+	bus = malloc(sizeof(*bus));
+	if (!bus)
+		return bus;
+
+	mdio_init(&bus->mii);
+
+	return bus;
+}
+
+void bb_miiphy_free(struct bb_miiphy_bus *bus)
+{
+	free(bus);
+}
+
 /*****************************************************************************
  *
  * Utility to send the preamble, address, and register (common to read

include/miiphy.h

@@ -73,11 +73,15 @@ struct bb_miiphy_bus {
 	int (*set_mdc)(struct bb_miiphy_bus *bus, int v);
 	int (*delay)(struct bb_miiphy_bus *bus);
 	void *priv;
+	struct mii_dev mii;
 };
 
 extern struct bb_miiphy_bus bb_miiphy_buses[];
 extern int bb_miiphy_buses_num;
 
+struct bb_miiphy_bus *bb_miiphy_alloc(void);
+void bb_miiphy_free(struct bb_miiphy_bus *bus);
+
 int bb_miiphy_read(struct mii_dev *miidev, int addr, int devad, int reg);
 int bb_miiphy_write(struct mii_dev *miidev, int addr, int devad, int reg,
 		    u16 value);