phy: marvell: Add support for temperature sensor
Some Marvell PHYs have an inbuilt temperature sensor. Add hwmon support for this sensor. There are two different variants. The simpler, older chips have a 5 degree accuracy. The newer devices have 1 degree accuracy. Signed-off-by: NAndrew Lunn <andrew@lunn.ch> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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