Support LAN743x PTP periodic output on any GPIO
The LAN743x Ethernet controller provides two independent PTP event channels. Each one can be used to generate a periodic output from the PTP clock. The output can be routed to any one of the available GPIO pins on the device. The PTP clock API can now be used to: - select any LAN743x GPIO pin to function as a periodic output - select either LAN743x PTP event channel to generate the output The LAN7430 has 4 GPIO pins that are multiplexed with its internal PHY LED control signals. A pin assigned to the LED control function will be assigned to the GPIO function if selected for PTP periodic output. Signed-off-by: NJohn Efstathiades <john.efstathiades@pebblebay.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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