From mboxrd@z Thu Jan  1 00:00:00 1970
From: "George G. Davis" <george_davis@mentor.com>
Subject: Re: [PATCH] net: fec: dt: convert phy-reset-gpios to use GPIOD API
Date: Tue, 31 May 2016 14:33:01 -0400
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To: Russell King - ARM Linux <linux@armlinux.org.uk>
Cc: Fabio Estevam <festevam@gmail.com>, "linux-gpio@vger.kernel.org" <linux-gpio@vger.kernel.org>, linux-kernel <linux-kernel@vger.kernel.org>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>, Fugang Duan <fugang.duan@nxp.com>, Rob Herring <robh+dt@kernel.org>, Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>, Ian Campbell <ijc+devicetree@hellion.org.uk>, Kumar Gala <galak@codeaurora.org>, Shawn Guo <shawnguo@kernel.org>, Sascha Hauer <kernel@pengutronix.de>, Linus Walleij <linus.walleij@linaro.org>, Alexandre Courbot <gnurou@gmail.com>

Hello Russell,

On Tue, May 31, 2016 at 07:26:42PM +0100, Russell King - ARM Linux wrote:
> On Tue, May 31, 2016 at 02:24:50PM -0400, George G. Davis wrote:
> > Hello Fabio,
> > 
> > On Tue, May 31, 2016 at 02:26:54PM -0300, Fabio Estevam wrote:
> > > On Tue, May 31, 2016 at 2:17 PM, George G. Davis
> > > <george_davis@mentor.com> wrote:
> > > > Convert the i.MX FEC driver and DT files to use the GPIOD API
> > > > which automatically handles GPIO polarity.
> > > >
> > > > Signed-off-by: George G. Davis <george_davis@mentor.com>
> > > 
> > > In order to avoid breaking old dtb's a property called
> > > 'phy-reset-active-high' has been introduced.
> > > 
> > > Check: 962d8cdc3133435a ("net: fec: Rename "phy-reset-active-low"
> > > property") and 64f10f6ebf5a6d3ae ("net: fec: Add
> > > "phy-reset-active-low" property to DT").
> > 
> > The GPIOD API handles GPIO active assertion levels as defined by the 
> > DT binding. So the phy-reset-active-high and/or phy-reset-active-low
> > property is not needed when using the GPIOD API - just define
> > GPIO_ACTIVE_LOW or GPIO_ACTIVE_HIGH as required for the board and the
> > GPIOD API will handle active assert/deassert level as needed.
> 
> You must retain compatibility with _existing_ DT files.  Hence,
> while you can convert to using the gpiod API, you still need to
> be compatible with the old way of specifying this - iow, you must
> support the old properties in the code.

Sigh, thanks for the ClueBat. Got it. I'll rework the patch to retain
compatibility with existing DT files.

-- 
Regards,
George