netdev - Re: [PATCH 1/6] bus: Add shared MDIO bus framework

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Date:	Tue, 26 Apr 2016 20:23:35 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Florian Fainelli <f.fainelli@...il.com>,
	Pramod Kumar <pramod.kumar@...adcom.com>,
	Rob Herring <robh+dt@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Chen-Yu Tsai <wens@...e.org>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Pawel Moll <pawel.moll@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	netdev@...r.kernel.org, Punit Agrawal <punit.agrawal@....com>,
	linux-kernel@...r.kernel.org,
	BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
	linux-arm-kernel@...ts.infradead.org,
	Anup Patel <anup.patel@...adcom.com>,
	Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH 1/6] bus: Add shared MDIO bus framework

> A more complex problem would be having a PHY driver for a device
> that can be either an ethernet phy or some other phy.

I doubt that ever happens. You can have up to 32 different devices on
an MDIO bus. Since an Ethernet PHY and a "some other sort of PHY" are
completely different things, why would a hardware engineer place them
on the same address? It is like saying your ATA controller and VGA
controller share the same slot on the PCI bus...

   Andrew