netdev - Re: [PATCH RFT 2/2] macb: kill PHY reset code

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Message-ID: <570BEF46.7060105@cogentembedded.com>
Date:	Mon, 11 Apr 2016 21:39:02 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	nicolas.ferre@...el.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH RFT 2/2] macb: kill PHY reset code

Hello.

On 04/11/2016 09:19 PM, Andrew Lunn wrote:

>>> The code you are deleting would of ignored the flags in the gpio
>>> property, i.e. active low.
>>
>>     Hm, you're right -- I forgot about that... :-/
>>
>>> The new code in the previous patch does
>>> however take the flags into account. Did you check if there are any
>>> device trees which have flags, which were never used, but are now
>>> going to be used and thus break...
>>
>>     Checked this now and found out arch/arm/boot/dts/ar91-vinco.dts.
>> Looks like it needs to be fixed indeed...
>>
> And this is where it gets tricky. You are breaking backwards
> compatibility by now respecting the flag. An old DT blob is not going
> to work.

    Do we care that much about the DT blobs that are just *wrong*?

> You potentially need to add a new property and deprecate the old one.

    I would like to avoid that...

>      Andrew

MBR, Sergei