linux-kernel - Re: [PATCH] MDIO: FSL_PQ_MDIO: Fix bug on incorrect offset of tbipa register

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Message-ID: <51B871CB.1090808@tabi.org>
Date:	Wed, 12 Jun 2013 08:04:11 -0500
From:	Timur Tabi <timur@...i.org>
To:	Oded Gabbay <ogabbay@...aoptical.com>, benh@...nel.crashing.org,
	paulus@...ba.org, leoli@...escale.com, galak@...nel.crashing.org,
	B38951@...escale.com, Dongsheng.Wang@...escale.com,
	bigeasy@...utronix.de, stef.van.os@...drive.nl, davem@...emloft.net
CC:	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] MDIO: FSL_PQ_MDIO: Fix bug on incorrect offset of tbipa
 register

Oded Gabbay wrote:
> Note: This patch may break MDIO functionallity of some old Freescale's SoC
> until Freescale will fix their device tree files. Basically, every device tree
> which contains an mdio device that is compatible to "fsl,gianfar-tbi" should be
> examined.

I haven't had a chance to review the patch in detail, but I can tell you 
that breaking compatibility with older device trees is unacceptable.  You 
need to add some code, even if it's an ugly hack, to support those trees.

-- 
Timur Tabi
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