linux-kernel - Re: [PATCH 2/6] Documentation: DT binding doc for iProc Shared MDIO Controller.

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Message-ID: <20160425153336.GK6575@lunn.ch>
Date:	Mon, 25 Apr 2016 17:33:36 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Pramod Kumar <pramod.kumar@...adcom.com>
Cc:	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>,
	BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Punit Agrawal <punit.agrawal@....com>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/6] Documentation: DT binding doc for iProc Shared MDIO
 Controller.

> +Example:
> +iproc_mdio: iproc_mdio@...f0000 {
> +	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