Subject: Re: [PATCH v2a 1/2] dt: Document a compatible entry for MDIO ethernet Phys

From: Ben Dooks <[email-masked]>
Date: Thu, 20 Mar 2014 09:26:28 +0100

On 19/03/14 23:15, Jason Gunthorpe wrote:
> This describes a compatible entry of the form:
>    ethernet-phy-idAAAA,BBBB
> Which is modelled after the PCI structured compatible entry
> (pciVVVV,DDDD.SSSS.ssss.RR)
>
> If present the OF core will be able to use this information to
> directly create the correct phy without auto probing the bus.
>
> Signed-off-by: Jason Gunthorpe <[email-masked]>
> Acked-by: Rob Herring <[email-masked]>
> Acked-by: Florian Fainelli <[email-masked]>
> ---
>   Documentation/devicetree/bindings/net/phy.txt | 10 +++++++++-
>   1 file changed, 9 insertions(+), 1 deletion(-)
>
> - Resend for net-next
>
> diff --git a/Documentation/devicetree/bindings/net/phy.txt b/Documentation/devicetree/bindings/net/phy.txt
> index 58307d0..5b8c589 100644
> --- a/Documentation/devicetree/bindings/net/phy.txt
> +++ b/Documentation/devicetree/bindings/net/phy.txt
> @@ -21,10 +21,18 @@ Optional Properties:
>     elements.
>   - max-speed: Maximum PHY supported speed (10, 100, 1000...)
>
> +  If the phy's identifier is known then the list may contain an entry
> +  of the form: "ethernet-phy-idAAAA.BBBB" where
> +     AAAA - The value of the 16 bit Phy Identifier 1 register as
> +            4 hex digits. This is the chip vendor OUI bits 3:18
> +     BBBB - The value of the 16 bit Phy Identifier 2 register as
> +            4 hex digits. This is the chip vendor OUI bits 19:24,
> +            followed by 10 bits of a vendor specific ID.
> +

How about having "ethernet-phy" and adding a single property in the
PHY node saying phy-id = <AAAABBBB>, which would be much easier to
parse.

>   Example:
>
>   ethernet-phy@0 {
> -	compatible = "ethernet-phy-ieee802.3-c22";
> +	compatible = "ethernet-phy-id0141.0e90", "ethernet-phy-ieee802.3-c22";
>   	interrupt-parent = <40000>;
>   	interrupts = <35 1>;
>   	reg = <0>;
>

-- 
Ben Dooks				http://www.codethink.co.uk/
Senior Engineer				Codethink - Providing Genius