linux-kernel - Re: [PATCH RESEND v2] net: fec: fix MDIO bus assignement for dual fec SoC's

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Message-Id: <20150114.002730.1449798194556067465.davem@davemloft.net>
Date:	Wed, 14 Jan 2015 00:27:30 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	stefan@...er.ch
Cc:	shawn.guo@...aro.org, u.kleine-koenig@...gutronix.de,
	fugang.duan@...escale.com, fabio.estevam@...escale.com,
	mark.rutland@....com, robh+dt@...nel.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	B38611@...escale.com, LW@...O-electronics.de,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH RESEND v2] net: fec: fix MDIO bus assignement for dual
 fec SoC's

From: Stefan Agner <stefan@...er.ch>
Date: Wed, 14 Jan 2015 00:20:21 +0100

> On i.MX28, the MDIO bus is shared between the two FEC instances.
> The driver makes sure that the second FEC uses the MDIO bus of the
> first FEC. This is done conditionally if FEC_QUIRK_ENET_MAC is set.
> However, in newer designs, such as Vybrid or i.MX6SX, each FEC MAC
> has its own MDIO bus. Simply removing the quirk FEC_QUIRK_ENET_MAC
> is not an option since other logic, triggered by this quirk, is
> still needed.
> 
> Furthermore, there are board designs which use the same MDIO bus
> for both PHY's even though the second bus would be available on the
> SoC side. Such layout are popular since it saves pins on SoC side.
> Due to the above quirk, those boards currently do work fine. The
> boards in the mainline tree with such a layout are:
> - Freescale Vybrid Tower with TWR-SER2 (vf610-twr.dts)
> - Freescale i.MX6 SoloX SDB Board (imx6sx-sdb.dts)
> 
> This patch adds a new quirk FEC_QUIRK_SINGLE_MDIO for i.MX28, which
> makes sure that the MDIO bus of the first FEC is used in any case.
> 
> However, the boards above do have a SoC with a MDIO bus for each FEC
> instance. But the PHY's are not connected in a 1:1 configuration. A
> proper device tree description is needed to allow the driver to
> figure out where to find its PHY. This patch fixes that shortcoming
> by adding a MDIO bus child node to the first FEC instance, along
> with the two PHY's on that bus, and making use of the phy-handle
> property to add a reference to the PHY's.
> 
> Acked-by: Sascha Hauer <s.hauer@...gutronix.de>
> Signed-off-by: Stefan Agner <stefan@...er.ch>

Applied, thanks.
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