Date: Mon, 25 Apr 2016 17:33:36 +0200
From: Andrew Lunn <andrew@lunn.ch>
To: Pramod Kumar <pramod.kumar@broadcom.com>
Cc: Rob Herring <robh+dt@kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will.deacon@arm.com>,
        Masahiro Yamada <yamada.masahiro@socionext.com>,
        Chen-Yu Tsai <wens@csie.org>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@broadcom.com>,
        Pawel Moll <pawel.moll@arm.com>, Mark Rutland <mark.rutland@arm.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Punit Agrawal <punit.agrawal@arm.com>, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org
Subject: Re: [PATCH 2/6] Documentation: DT binding doc for iProc Shared MDIO
 Controller.
Message-ID: <20160425153336.GK6575@lunn.ch>
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> +Example:
> +iproc_mdio: iproc_mdio@663f0000 {
> +	compatible = "brcm,iproc-shared-mdio";
> +	reg = <0x6602023c 0x14>;
> +	reg-names = "mdio";
> +	#address-cells = <1>;
> +	#size-cells = <0>;
> +
> +	sata-master@6 {
> +		compatible = "brcm,iproc-ns2-sata-phy";
> +		reg = <0x6>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		brcm,phy-internal;
> +
> +		sata_phy0: sata-phy@1 {
> +			reg = <0x1>;
> +			#phy-cells = <0>;
> +		};
> +
> +		sata_phy1: sata-phy@2 {
> +			reg = <0x2>;
> +			#phy-cells = <0>;
> +		};
> +	};
> +
> +	eth-master@0 {
> +		compatible = "brcm,iproc-mdio-master-eth";
> +		reg = <0x0>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +		gphy0: eth-phy@10 {
> +			reg = <0x10>;
> +			phy-mode = "mii";
> +		};
> +	};
> +};

So looking at this, you have an MDIO bus, an MDIO mux on top of that,
and then some MDIO devices on the muxed busses. You don't need a whole
new framework for this. You need a new mdio-mux driver, but the
existing MDIO framework should do what you need.

	 Andrew