linux-kernel - Re: [PATCH 2/3] net: fec: convert to using gpiod framework

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Message-ID: <CAOMZO5BF=V2Q6BT17UHvx=QzupDaC1d=negP1URP4kaWZg9eAA@mail.gmail.com>
Date:	Mon, 30 Nov 2015 10:17:32 -0200
From:	Fabio Estevam <festevam@...il.com>
To:	Lothar Waßmann <LW@...o-electronics.de>
Cc:	Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Greg Ungerer <gerg@...inux.org>,
	Kevin Hao <haokexin@...il.com>,
	Lucas Stach <l.stach@...gutronix.de>,
	Nimrod Andy <B38611@...escale.com>,
	Philippe Reynes <tremyfr@...il.com>,
	Richard Cochran <richardcochran@...il.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Stefan Agner <stefan@...er.ch>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH 2/3] net: fec: convert to using gpiod framework

On Mon, Nov 30, 2015 at 9:32 AM, Lothar Waßmann <LW@...o-electronics.de> wrote:

> -       gpio_set_value_cansleep(phy_reset, 1);
> +       gpiod_set_value_cansleep(phy_reset, 1);

This will break some existing DTBs.

Currently the fec driver does not care whether 'phy-reset-gpios' is
active low or active high. (Yes, it was a mistake to assume in the
driver that it is always active low.)

After this change the polarity will be taken into account and may
break some dtb's.

I suggest you to send a single patch with the minimum changes to fix
the regression caused by 8fff755e9f8d ("net: fec: Ensure clocks are
enabled while using mdio bus").
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