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

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Message-ID: <532AA634.5090707@codethink.co.uk>
Date:	Thu, 20 Mar 2014 09:26:28 +0100
From:	Ben Dooks <ben.dooks@...ethink.co.uk>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Rob Herring <robh+dt@...nel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2a 1/2] dt: Document a compatible entry for MDIO ethernet
 Phys

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 <jgunthorpe@...idianresearch.com>
> Acked-by: Rob Herring <robh@...nel.org>
> Acked-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>   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
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