# Re: \[PATCH\] Documentation: net: phy: improve explanation when to specify the PHY ID

- From: Andrew Lunn \<hidden\>
- Date: 2017-01-22 16:57:04 
- List: netdev
- Page: https://ratatoskr.run/netdev/2017/01/8133955
- Thread: https://ratatoskr.run/linux-devicetree/2017/01/8133955/t.md

```text
On Sun, Jan 22, 2017 at 05:41:32PM +0100, Martin Blumenstingl wrote:
> The old description basically read like "ethernet-phy-idAAAA.BBBB" can
> be specified when you know the actual PHY ID. However, specifying this
> has a side-effect: it forces Linux to bind to a certain PHY driver (the
> one that matches the ID given in the compatible string), ignoring the ID
> which is reported by the actual PHY.
> Whenever a device is shipped with (multiple) different PHYs during it's
> production lifetime then explicitly specifying
> "ethernet-phy-idAAAA.BBBB" could break certain revisions of that device.
> 
> Signed-off-by: Martin Blumenstingl <redacted>

Reviewed-by: Andrew Lunn <redacted>

Thanks
    Andrew
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