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

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Date:	Tue, 26 Apr 2016 19:45:05 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Pramod Kumar <pramod.kumar@...adcom.com>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
	Pawel Moll <pawel.moll@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Punit Agrawal <punit.agrawal@....com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org,
	Masahiro Yamada <yamada.masahiro@...ionext.com>,
	Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
	BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Anup Patel <anup.patel@...adcom.com>
Subject: Re: [PATCH 1/6] bus: Add shared MDIO bus framework

> I am not clear on how common a shared MDIO bus is on other SoCs, but the
> other Broadcom SoCs I am familiar with have dedicated MDIO buses
> instances per type of PHY (PCIe, BUSB, Ethernet), thus making the split
> a ton easier.

I don't actually see this shared bus being an issue, once the mux it
implemented. With the mux, you see N MDIO busses, each acting like a
normal MDIO bus. I've used the GPIO variety and had no issues:

http://marc.info/?l=linux-arm-kernel&m=145910090401796&w=2

	Andrew