net: phy: sfp: make the i2c-bus dt property mandatory
This patch makes the i2c-bus property mandatory when using a device tree. If the sfp i2c bus isn't described it's impossible to guess the protocol to use for a given module, and the sfp module would then not work in most cases. Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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