linux-kernel - Re: [PATCH v2] net: fec: fix conversion to gpiod API

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Date:   Wed, 1 Feb 2023 10:25:15 -0800
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Wei Fang <wei.fang@....com>, Jakub Kicinski <kuba@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Shenwei Wang <shenwei.wang@....com>,
        Clark Wang <xiaoning.wang@....com>,
        NXP Linux Team <linux-imx@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] net: fec: fix conversion to gpiod API

On Wed, Feb 01, 2023 at 07:04:29PM +0100, Andrew Lunn wrote:
> On Tue, Jan 31, 2023 at 07:23:16PM -0800, Dmitry Torokhov wrote:
> > The reset line is optional, so we should be using devm_gpiod_get_optional()
> > and not abort probing if it is not available. Also, there is a quirk in
> > gpiolib (introduced in b02c85c9458cdd15e2c43413d7d2541a468cde57) that
> > transparently handles "phy-reset-active-high" property. Remove handling
> > from the driver to avoid ending up with the double inversion/flipped
> > logic.
> > 
> > Fixes: 468ba54bd616 ("fec: convert to gpio descriptor")
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> 
> Please split this into two:
> 
> 1) Fix for it being optional
> 2) Removing support for phy-reset-active-high
> 
> The breakage is in net-next, so we are not in a rush, and we don't
> need a minimum of patches. So since this is two logical changes, it
> should be two patches.

Hm, so you want the driver be still broken after changing the call to be
devm_gpiod_get_optional()? Because you can not have this driver use
gpiod API and keep parsing 'phy-reset-active-high' (by the driver
itself).

OK, I suppose I can do that...

> 
> Please also update the binding document to indicate that
> 'phy-reset-active-high' is no longer deprecated, it has actually been
> removed. So we want the DT checking tools to error out if such a
> property is found.

We still parse 'phy-reset-active-high', just parsing happens elsewhere
(in gpiolib), so it is not an error to have it in a binding.

Thanks.

-- 
Dmitry