The Read Control Register command requires that a dummy byte be read
before the register value for the MAC and MII registers.
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
The read/writedatabyte() functions are just a special case of
read/writedata() with a simpler API, so reuse these instead of
duplicating code.
Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>
