linux-kernel - Re: [PATCH] net: phy: micrel: disable NAND-tree for KSZ8021,KSZ8031,KSZ8051,KSZ8081

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Message-Id: <20150214.203139.1139744729261595659.davem@davemloft.net>
Date:	Sat, 14 Feb 2015 20:31:39 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	sylvain.rochet@...secur.com
Cc:	f.fainelli@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, nicolas.ferre@...el.com,
	alexandre.belloni@...e-electrons.com, voice.shen@...el.com,
	josh.wu@...el.com, ludovic.desroches@...el.com,
	boris.brezillon@...e-electrons.com
Subject: Re: [PATCH] net: phy: micrel: disable NAND-tree for
 KSZ8021,KSZ8031,KSZ8051,KSZ8081

From: Sylvain Rochet <sylvain.rochet@...secur.com>
Date: Fri, 13 Feb 2015 21:35:33 +0100

> NAND-tree is used to check wiring between MAC and PHY using NAND gates
> on the PHY side, hence the name.
> 
> NAND-tree initial status is latched at reset by probing the IRQ pin.
> However some devices are sharing the PHY IRQ pin with other peripherals
> such as Atmel SAMA5D[34]x-EK boards when using the optional TM7000
> display module, therefore they are switching the PHY in NAND-tree test
> mode depending on the current IRQ line status at reset.
> 
> This patch ensure PHY is not in NAND-tree test mode for all Micrel PHYs
> using IRQ line as a NAND-tree toggle mode at reset.
> 
> Signed-off-by: Sylvain Rochet <sylvain.rochet@...secur.com>
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>

Applied.
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