linux-kernel - Re: [PATCH v2 2/3] netdev/of/phy: Add MDIO bus multiplexer support.

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Message-ID: <4E8350A8.7090307@cavium.com>
Date:	Wed, 28 Sep 2011 09:51:52 -0700
From:	David Daney <david.daney@...ium.com>
To:	Michał Mirosław <mirqus@...il.com>
CC:	devicetree-discuss@...ts.ozlabs.org, grant.likely@...retlab.ca,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH v2 2/3] netdev/of/phy: Add MDIO bus multiplexer support.

On 09/28/2011 12:25 AM, Michał Mirosław wrote:
> 2011/9/28 David Daney<david.daney@...ium.com>:
> [...]
>> +Example :
>> +
>> +       /* The parent MDIO bus. */
>> +       smi1: mdio@...0000001900 {
>> +               compatible = "cavium,octeon-3860-mdio";
>> +               #address-cells =<1>;
>> +               #size-cells =<0>;
>> +               reg =<0x11800 0x00001900 0x0 0x40>;
>> +       };
>> +
>> +       /*
>> +          An NXP sn74cbtlv3253 dual 1-of-4 switch controlled by a
>> +          pair of GPIO lines.  Child busses 2 and 3 populated with 4
>> +          PHYs each.
>> +        */
>> +       mdio-mux {
>> +               compatible = "cavium,mdio-mux-sn74cbtlv3253", "cavium,mdio-mux";
>> +               gpios =<&gpio1 3 0>,<&gpio1 4 0>;
>> +               mdio-parent-bus =<&smi1>;
>> +               #address-cells =<1>;
>> +               #size-cells =<0>;
>
> This should probably have 'compatible = "nxp,sn74cbtlv3253";' here.
>

No, the sn74cbtlv3253 is a general purpose part that could be used to 
multiplex anything (I2C, SPI, random analog signals, etc.).  Only when 
it is in the "cavium,mdio-mux-sn74cbtlv3253" configuration is it an MDIO 
bus multiplexer.

David Daney.
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