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

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Date:	Tue, 12 Apr 2016 11:23:29 +0200
From:	Nicolas Ferre <nicolas.ferre@...el.com>
To:	Andrew Lunn <andrew@...n.ch>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
CC:	<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree@...r.kernel.org>
Subject: Re: [PATCH RFT 2/2] macb: kill PHY reset code

Le 11/04/2016 20:51, Andrew Lunn a écrit :
> On Mon, Apr 11, 2016 at 09:39:02PM +0300, Sergei Shtylyov wrote:
>> 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*?
> 
> Wrong, but currently works.
> 
>>> You potentially need to add a new property and deprecate the old one.
>>
>>    I would like to avoid that...
> 
> You will need the agreement from the at91-vinco maintainer.

If the at91-vinco has to be modified, you have my agreement that it can
be modified.

Bye,
-- 
Nicolas Ferre