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

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Message-ID: <CAHXqBF+ZVbCGEvnCcOtHk+sOWFLp1CuEnGLq+GEtHQTpu9PuYg@mail.gmail.com>
Date:	Wed, 28 Sep 2011 19:32:16 +0200
From:	Michał Mirosław <mirqus@...il.com>
To:	David Daney <david.daney@...ium.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.

W dniu 28 września 2011 18:51 użytkownik David Daney
<david.daney@...ium.com> napisał:
> 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.

This should use some generic name then. 'mdio-mux-gpio' or something.
There's no point in introducing chip's model for a gate-like discrete
device.

Best Regards,
Michał Mirosław
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