linux-kernel - Re: [PATCH V3] net/dt: Add support for overriding phy configuration from device tree

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Date:	Sun, 19 Jan 2014 15:34:14 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Matthew Garrett <matthew.garrett@...ula.com>
Cc:	netdev@...r.kernel.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, kishon@...com
Subject: Re: [PATCH V3] net/dt: Add support for overriding phy configuration
 from device tree

On Fri, 2014-01-17 at 17:57 -0500, Matthew Garrett wrote:
> Some hardware may be broken in interesting and board-specific ways, such
> that various bits of functionality don't work. This patch provides a
> mechanism for overriding mii registers during init based on the contents of
> the device tree data, allowing board-specific fixups without having to
> pollute generic code.
[...]
> --- a/Documentation/devicetree/bindings/net/phy.txt
> +++ b/Documentation/devicetree/bindings/net/phy.txt
> @@ -23,6 +23,21 @@ Optional Properties:
>    assume clause 22. The compatible list may also contain other
>    elements.
>  
> +The following properties may be added to either the phy node or the parent
> +ethernet device. If not present, the hardware defaults will be used.
> +
> +- phy-mii-advertise-10half: 1 to advertise half-duplex 10MBit, 0 to disable
> +- phy-mii-advertise-10full: 1 to advertise full-duplex 10MBit, 0 to disable
> +- phy-mii-advertise-100half: 1 to advertise half-duplex 100MBit, 0 to disable
> +- phy-mii-advertise-100full: 1 to advertise full-duplex 100MBit, 0 to disable
> +- phy-mii-advertise-100base4: 1 to advertise 100base4, 0 to disable
> +- phy-mii-advertise-1000half: 1 to advertise half-duplex 1000MBit, 0 to disable
> +- phy-mii-advertise-1000full: 1 to advertise full-duplex 1000MBit, 0 to disable

Are these really all needed?  Apparently there is a standard 'max-speed'
property on Ethernet devices already, which I think is probably
sufficient to express the actual restrictions of some boards.

> +- phy-mii-manual-master: 1 to enable manual master/slave configuration, 0
> +  to disable manual master/slave configuration
[...]

Although the standard calls this 'manual', if it's set in the DT it
won't really be a manual setting.  The description should probably
clarify that.

I think the name should include 'master-slave' or 'clock-role' rather
than just 'master', as currently it suggests only the master role can be
forced.

Ben.

-- 
Ben Hutchings
friends: People who know you well, but like you anyway.

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