linux-kernel - Re: [PATCH net-next] net: stmmac: Fix the case when PHY handle is not present

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Message-ID: <20190625145105.GA4722@lunn.ch>
Date:   Tue, 25 Jun 2019 16:51:05 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Katsuhiro Suzuki <katsuhiro@...suster.net>
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        "David S . Miller" <davem@...emloft.net>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>
Subject: Re: [PATCH net-next] net: stmmac: Fix the case when PHY handle is
 not present

On Tue, Jun 25, 2019 at 11:40:00PM +0900, Katsuhiro Suzuki wrote:
> Hello Jose,
> 
> This patch works fine with my Tinker Board. Thanks a lot!
> 
> Tested-by: Katsuhiro Suzuki <katsuhiro@...suster.net>
> 
> 
> BTW, from network guys point of view, is it better to add a phy node
> into device trees that have no phy node such as the Tinker Board?

Hi Katsuhiro

It makes it less ambiguous if there is a phy-handle. It is then very
clear which PHY should be used. For a development board, which people
can be tinkering around with, there is a chance they add a second PHY
to the MDIO bus, or an Ethernet switch, etc. Without explicitly
listing the PHY, it might get the wrong one. However this is generally
a problem if phy_find_first() is used. I think in this case, something
is setting priv->plat->phy_addr, so it is also clearly defined which
PHY to use.

	  Andrew