[PATCH devicetree 2/2] dt-bindings: phy: Add `tx-amplitude-microvolt` property binding

[Andrew Lunn]

> Hi Andrew,
> 
> and where (into which directory) should this serdes.yaml file go?
> 
> My idea was to put the properties into common PHY and then refer to
> them from other places, so for example this would be put into ethernet
> PHY binding:
> 
>   serdes-tx-amplitude-microvolt:
>     $ref: '/schemas/phy/phy.yaml#/properties/tx-amplitude-microvolt'

I don't know much about yaml. If that works, that is fine by me. But
we should probably check with Rob this is best practice.

   Andrew