The DGS-1210-28 series was lacking full SFP support due to missing GPIOs.
Fortunately, the existing GPIO definitions of DGS-1210-52 match, this adds
the required i2c-gpio nodes to the DTS and allows hotplug SFP support.
Signed-off-by: Andreas Böhler <dev@aboehler.at>
Link: https://github.com/openwrt/openwrt/pull/15616
Signed-off-by: Sander Vanheule <sander@svanheule.net>