Implement Driver Enable signal (DE) to activate the transmission mode
of the external transceiver.
Signed-off-by: NYves Coppeaux <yves.coppeaux@st.com>
Signed-off-by: NBich Hemon <bich.hemon@st.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>