linux-kernel - Re: [PATCH v2 2/7] DT: phy.txt: Add mdio-integrated-mux property

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Message-ID: <20160602232703.GA17619@rob-hp-laptop>
Date:	Thu, 2 Jun 2016 18:27:03 -0500
From:	Rob Herring <robh@...nel.org>
To:	Pramod Kumar <pramod.kumar@...adcom.com>
Cc:	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Kishon Vijay Abraham I <kishon@...com>,
	"David S. Miller" <davem@...emloft.net>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	bcm-kernel-feedback-list@...adcom.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v2 2/7] DT: phy.txt: Add mdio-integrated-mux property

On Tue, May 31, 2016 at 07:06:36PM +0530, Pramod Kumar wrote:
> This property is used by integrated MDIO multiplexer
> which has bus selection and mdio transaction generation logic,
> integrated inside.
> 
> Signed-off-by: Pramod Kumar <pramod.kumar@...adcom.com>
> ---
>  Documentation/devicetree/bindings/net/mdio-mux.txt | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/mdio-mux.txt b/Documentation/devicetree/bindings/net/mdio-mux.txt
> index 491f5bd..b5ad83e 100644
> --- a/Documentation/devicetree/bindings/net/mdio-mux.txt
> +++ b/Documentation/devicetree/bindings/net/mdio-mux.txt
> @@ -5,13 +5,20 @@ numbered uniquely in a device dependent manner.  The nodes for an MDIO
>  bus multiplexer/switch will have one child node for each child bus.
>  
>  Required properties:
> -- mdio-parent-bus : phandle to the parent MDIO bus.
>  - #address-cells = <1>;
>  - #size-cells = <0>;
>  
>  Optional properties:
> +- mdio-parent-bus : phandle to the parent MDIO bus. Should be used
> +		if parent mdio bus is not part of multiplexer.

You don't appear to be using this. When would you?

> +- mdio-integrated-mux: boolean property indicateing that the hardware
> +		is an integrated multiplex supporting muxed bus selection
> +		and MDIO transaction logic generation.
>  - Other properties specific to the multiplexer/switch hardware.
>  
> +Note: one of mdio-parent-bus and mdio-integrated-mux is mandatory to
> +get parent bus regsitered.
> +
>  Required properties for child nodes:
>  - #address-cells = <1>;
>  - #size-cells = <0>;
> -- 
> 1.9.1
>