u-boot/doc/device-tree-bindings/phy/no-op.txt

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NOP PHY driver
This driver is used to stub PHY operations in a driver (USB, SATA).
This is useful when the 'client' driver (USB, SATA, ...) uses the PHY framework
and there is no actual PHY harwdare to drive.
Required properties:
- compatible : must contain "nop-phy"
- #phy-cells : must contain <0>
Example:
nop_phy {
compatible = "nop-phy";
#phy-cells = <0>;
};