Re: [PATCH] net: fec: dt: convert phy-reset-gpios to use GPIOD API

[Russell King - ARM Linux <linux@xxxxxxxxxxxxxxx>]

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@xxxxxxxxxx> 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@xxxxxxxxxx>
> > 
> > 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.

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