From: Grant Likely <grant.likely@secretlab.ca>
To: Florian Fainelli <f.fainelli@gmail.com>,
Matthew Garrett <matthew.garrett@nebula.com>
Cc: netdev <netdev@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Kishon Vijay Abraham I <kishon@ti.com>
Subject: Re: [PATCH V3] net/dt: Add support for overriding phy configuration from device tree
Date: Wed, 05 Feb 2014 09:47:03 +0000 [thread overview]
Message-ID: <20140205094703.37C1EC40A89@trevor.secretlab.ca> (raw)
In-Reply-To: <CAGVrzcZ4TFd=9KP+aoG47QbmqDJ1i23WBcEWDbzNRUfGmPvZHQ@mail.gmail.com>
On Tue, 4 Feb 2014 12:39:41 -0800, Florian Fainelli <f.fainelli@gmail.com> wrote:
> 2014-01-17 Matthew Garrett <matthew.garrett@nebula.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?
>
> Is not a PHY fixup registered for a specific OUI the solution you are
> looking for? I am also concerned that this creates PHY troubleshooting
> issues much harder to debug than before as we may have no idea about
> how much information has been put in Device Tree to override that.
>
> Finally, how about making this more general just like the BCM87xx PHY
> driver, which is supplied value/reg pairs directly? There are 16
> common MII registers, and 16 others for vendor specific registers,
> this is just covering for about 2% of the possible changes.
I would be fine with that too.
g.
next prev parent reply other threads:[~2014-02-05 9:47 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-15 21:38 [PATCH] net/dt: Add support for overriding phy configuration from device tree Matthew Garrett
2014-01-16 13:59 ` Gerhard Sittig
2014-01-16 14:40 ` Matthew Garrett
[not found] ` <20140116135905.GV20094-kDjWylLy9wD0K7fsECOQyeGNnDKD8DIp@public.gmane.org>
2014-01-16 14:47 ` [PATCH V2] " Matthew Garrett
[not found] ` <1389883631-1480-1-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2014-01-16 15:16 ` Arnd Bergmann
[not found] ` < 1389999459-9483-1-git-send-email-matthew.garrett@nebula.com>
2014-01-17 22:57 ` [PATCH V3] " Matthew Garrett
2014-01-19 15:34 ` Ben Hutchings
[not found] ` <1390145654.16433.102.camel-nDn/Rdv9kqW9Jme8/bJn5UCKIB8iOfG2tUK59QYPAWc@public.gmane.org>
2014-02-04 19:01 ` Florian Fainelli
2014-02-04 17:15 ` Grant Likely
2014-02-04 20:39 ` Florian Fainelli
2014-02-04 21:40 ` Ben Hutchings
2014-02-04 22:48 ` Florian Fainelli
2014-02-05 9:47 ` Grant Likely [this message]
2014-02-05 9:51 ` David Laight
[not found] ` <063D6719AE5E284EB5DD2968C1650D6D0F6B8BCA-VkEWCZq2GCInGFn1LkZF6NBPR1lH4CV8@public.gmane.org>
2014-02-07 22:43 ` Florian Fainelli
2014-02-10 16:14 ` Gerlando Falauto
[not found] ` <52F8FB03.6040606-SkAbAL50j+5BDgjK7y7TUQ@public.gmane.org>
2014-02-10 17:09 ` Florian Fainelli
2014-02-11 9:09 ` Gerlando Falauto
[not found] ` <52F9E8E6.1090006-SkAbAL50j+5BDgjK7y7TUQ@public.gmane.org>
2014-02-11 17:43 ` Florian Fainelli
2014-02-12 8:57 ` Gerlando Falauto
2014-07-10 12:37 ` Gerlando Falauto
[not found] ` <53BE8912.4090804-SkAbAL50j+5BDgjK7y7TUQ@public.gmane.org>
2014-07-22 23:40 ` Florian Fainelli
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