linux-kernel - Re: [PATCH] net: fec: Add "phy-reset-active-low" property to DT

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Message-ID: <20160208215138.GB13673@lunn.ch>
Date:	Mon, 8 Feb 2016 22:51:38 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Bernhard Walle <bernhard@...lle.de>, fabio.estevam@...escale.com,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] net: fec: Add "phy-reset-active-low" property to DT

On Mon, Feb 08, 2016 at 10:46:42PM +0100, Arnd Bergmann wrote:
> On Monday 08 February 2016 21:21:13 Bernhard Walle wrote:
> > We need that for a custom hardware that needs the reverse reset
> > sequence.
> > 
> > Signed-off-by: Bernhard Walle <bernhard@...lle.de>
> > 
> 
> Why can't this be specified in the gpios property?

Backwards compatibility. The flag has always been ignored until now,
yet various DTs have a flag value which are active low. If suddenly it
worked, various boards would break :-(

       Andrew