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

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Message-ID: <570BF481.9070903@cogentembedded.com>
Date:	Mon, 11 Apr 2016 22:01:21 +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

On 04/11/2016 09:51 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.

    Note that it's not only using GPIO_ACTIVE_HIGH but does that against what 
the MACB binding documents.

>>> 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.

   I'll try submitting a formal DT patch...

>      Andrew

MBR, Sergei