From: florian@openwrt•org (Florian Fainelli)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] net: fec: Add support for multiple phys on mdiobus
Date: Tue, 22 Jan 2013 15:47:45 +0100 [thread overview]
Message-ID: <50FEA691.4050904@openwrt.org> (raw)
In-Reply-To: <50FE3E37.4010004@grandegger.com>
On 01/22/2013 08:22 AM, Wolfgang Grandegger wrote:
>> Well this could be done when the fixed phy driver could be registered
>> with the devicetree, maybe like this:
>>
>> fixed-phy: mdiophy {
>> compatible = "mdio-fixed-phy";
>> link = "100FD";
>> };
>
> I find that confusing. There is *no* phy but just a fixed link to the
> switch...
>
>> The good thing about this would be that every ethernet driver could just
>> use such a fixed phy, any external mdio phy (like on Marvell Armada) or
>> just a phy connected to the internal mdio interface provided by the ethernet
>> core.
>
> What is wrong with the existing "fixed-link" property of the *ethernet*
> node. The fixed-link handling should/could be done in the phy layer, and
> not in the driver as it currently is implemented. Maybe that's the
> reason why the current code is regarded as hack!
As far as I have used it with the CPMAC driver, the fixed PHY is a
specific PHY device and there is no specific handling to be done by the
Ethernet MAC driver but eventually changing its MII bus id so that it is
named "fixed-0" to allow the fixed PHY driver to bind. Put differently,
using the fixed PHY driver is a kind of "last" resort thing to cope with
situations like:
- switch not providing a consistent PHY-like interface on the MDC/MDIO bus
- switches not connected to the MDC/MDIO bus of the Ethernet MAC they
forward to
What exactly do you mean by "as it currently is implemented"? that you
do not like?
--
Florian
next prev parent reply other threads:[~2013-01-22 14:47 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-21 8:37 [PATCH] net: fec: Add support for multiple phys on mdiobus Sascha Hauer
2013-01-21 8:37 ` [PATCH 1/2] net: fec: refactor dt probing Sascha Hauer
2013-01-21 17:48 ` Baruch Siach
2013-01-21 18:27 ` Sascha Hauer
2013-01-21 8:37 ` [PATCH 2/2] net: fec: Add support for phys from devicetree Sascha Hauer
2013-01-21 8:56 ` [PATCH] net: fec: Add support for multiple phys on mdiobus Wolfgang Grandegger
2013-01-21 10:07 ` Sascha Hauer
2013-01-21 11:07 ` Wolfgang Grandegger
2013-01-21 11:12 ` Florian Fainelli
2013-01-21 11:33 ` Wolfgang Grandegger
2013-01-21 11:56 ` Sascha Hauer
2013-01-21 12:06 ` Sascha Hauer
2013-01-22 7:22 ` Wolfgang Grandegger
2013-01-22 14:47 ` Florian Fainelli [this message]
2013-01-22 15:03 ` Wolfgang Grandegger
2013-01-22 15:19 ` Florian Fainelli
2013-01-22 15:26 ` Wolfgang Grandegger
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