linux-kernel - Re: [PATCH] net/macb: add support for resetting PHY using GPIO

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Message-ID: <20151210073756.GA11966@pengutronix.de>
Date:	Thu, 10 Dec 2015 08:37:56 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Gregory CLEMENT <gregory.clement@...e-electrons.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Subject: Re: [PATCH] net/macb: add support for resetting PHY using GPIO

Hi Gregory,

On Wed, Dec 09, 2015 at 06:49:43PM +0100, Gregory CLEMENT wrote:
> With device tree it is no more possible to reset the PHY at board
> level. Furthermore, doing in the driver allow to power down the PHY when
> the network interface is no more used.
> 
> The patch introduces a new optional property "phy-reset-gpio" inspired
> from the one use for the FEC.

I don't think it's a good idea to further extend the usage of this
binding. The driver should use the phy-handle property and
of_phy_connect() which gives you a proper device node for the phy. Then
the phy device node should get the reset gpio. I know it's more work,
but doing it like this gives you additional goodies like proper handling
of the max-speed property, a fixed-link if necessary and picking the
correct phy if there are muliple phys on the bus.

Sascha

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