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The property 'phy-connection-type' can be used to describe the interface
type between the Ethernet device and the Ethernet PHY device.

However, snps,dwmac.yaml gives the following warning:

imx8mp-debix-model-a.dtb: ethernet@30bf0000: 'phy-mode' is a required property
	from schema $id: http://devicetree.org/schemas/net/snps,dwmac.yaml#



To avoid the warning, switch to the more commonly used, 'phy-mode'
property instead.
Signed-off-by: Fabio Estevam <festevam@denx.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>