scripts: Add a cocci patch for miiphy_register

Many Ethernet drivers still use the legacy miiphy API to register their
mdio interface for access to the mdio commands.

This semantic patch will convert the drivers from the legacy adapter API
to the more modern alloc/register API.
Signed-off-by: NJoe Hershberger <joe.hershberger@ni.com>

scripts/coccinelle/net/mdio_register.cocci

+/// Use mdio_alloc and mdio_register instead of miiphy_register
+///
+//# Stop using the oldest mii interface in drivers
+//
+// Confidence: High
+// Copyright: (C) 2016 Joe Hershberger.  GPLv2.
+// Comments:
+// Options: --include-headers --recursive-includes --local-includes -I include
+
+@ mii_reg @
+expression devname;
+identifier readfunc, writefunc;
+@@
+
++ int retval;
+- miiphy_register(devname, readfunc, writefunc);
++ struct mii_dev *mdiodev = mdio_alloc();
++ if (!mdiodev) return -ENOMEM;
++ strncpy(mdiodev->name, devname, MDIO_NAME_LEN);
++ mdiodev->read = readfunc;
++ mdiodev->write = writefunc;
++ 
++ retval = mdio_register(mdiodev);
++ if (retval < 0) return retval;
+
+@ update_read_sig @
+identifier mii_reg.readfunc;
+identifier name0, addr0, reg0, output;
+type addrT, outputT;
+@@
+
+- readfunc (
+- 	const char *name0,
+- 	addrT addr0,
+- 	addrT reg0,
+- 	outputT *output
+- )
++ readfunc (
++ 	struct mii_dev *bus,
++ 	int addr0,
++ 	int devad,
++ 	int reg0
++ )
+  {
+  ...
+  }
+
+@ update_read_impl @
+identifier mii_reg.readfunc;
+identifier update_read_sig.output;
+type update_read_sig.outputT;
+constant c;
+identifier retvar;
+expression E;
+@@
+
+  readfunc (...)
+  {
++ outputT output = 0;
+  ...
+(
+- return 0;
++ return *output;
+|
+  return c;
+|
+- return retvar;
++ if (retvar < 0)
++ 	return retvar;
++ return *output;
+|
+- return E;
++ int retval = E;
++ if (retval < 0)
++ 	return retval;
++ return *output;
+)
+  }
+
+@ update_read_impl2 @
+identifier mii_reg.readfunc;
+identifier update_read_sig.output;
+@@
+
+  readfunc (...)
+  {
+  <...
+(
+- *output
++ output
+|
+- output
++ &output
+)
+  ...>
+  }
+
+@ update_read_name @
+identifier mii_reg.readfunc;
+identifier update_read_sig.name0;
+@@
+  readfunc (...) {
+  <...
+- name0
++ bus->name
+  ...>
+  }
+
+@ update_write_sig @
+identifier mii_reg.writefunc;
+identifier name0, addr0, reg0, value0;
+type addrT, valueT;
+typedef u16;
+@@
+
+- writefunc (
+- 	const char *name0,
+- 	addrT addr0,
+- 	addrT reg0,
+- 	valueT value0
+- )
++ writefunc (
++ 	struct mii_dev *bus,
++ 	int addr0,
++ 	int devad,
++ 	int reg0,
++ 	u16 value0
++ )
+  {
+  ...
+  }
+
+@ update_write_name @
+identifier mii_reg.writefunc;
+identifier update_write_sig.name0;
+@@
+  writefunc (...) {
+  <...
+- name0
++ bus->name
+  ...>
+  }