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

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Message-ID: <1391550040.3003.28.camel@deadeye.wl.decadent.org.uk>
Date:	Tue, 04 Feb 2014 21:40:40 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Matthew Garrett <matthew.garrett@...ula.com>,
	netdev <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH V3] net/dt: Add support for overriding phy configuration
 from device tree

On Tue, 2014-02-04 at 12:39 -0800, Florian Fainelli wrote:
> 2014-01-17 Matthew Garrett <matthew.garrett@...ula.com>:
> > 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.
> 
> It would be good to explain exactly how your hardware is broken
> exactly. I really do not think that such a fine-grained setting where
> you could disable, e.g: 100BaseT_Full, but allow 100BaseT_Half to
> remain usable makes that much sense. In general, Gigabit might be
> badly broken, but 100 and 10Mbits/sec should work fine. How about the
> MASTER-SLAVE bit, is overriding it really required?

Yes, it is entirely possible that one or other of the clock modes
(locally generated vs recovered) is not reliable.

> Is not a PHY fixup registered for a specific OUI the solution you are
> looking for?
[...]

The fault is in the board, not the PHY.

Ben.

-- 
Ben Hutchings
One of the nice things about standards is that there are so many of them.

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