netdev - Re: [PATCH 3/3] net: ethoc: document OF bindings

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Date:	Tue, 28 Jan 2014 00:45:05 +0400
From:	Max Filippov <jcmvbkbc@...il.com>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Rob Herring <robherring2@...il.com>,
	"linux-xtensa@...ux-xtensa.org" <linux-xtensa@...ux-xtensa.org>,
	netdev <netdev@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chris Zankel <chris@...kel.net>,
	Marc Gauthier <marc@...ence.com>,
	"David S. Miller" <davem@...emloft.net>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH 3/3] net: ethoc: document OF bindings

On Mon, Jan 27, 2014 at 11:45 PM, Florian Fainelli <f.fainelli@...il.com> wrote:
> 2014-01-27 Max Filippov <jcmvbkbc@...il.com>:
>> On Mon, Jan 27, 2014 at 6:10 PM, Rob Herring <robherring2@...il.com> wrote:
>>> On Sun, Jan 26, 2014 at 9:59 PM, Max Filippov <jcmvbkbc@...il.com> wrote:

[...]

>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/net/opencores-ethoc.txt
>>>> @@ -0,0 +1,25 @@
>>>> +* OpenCores MAC 10/100 Mbps
>>>> +
>>>> +Required properties:
>>>> +- compatible: Should be "opencores,ethoc".
>>>
>>> There are not different versions of IP or is the version probeable?
>>
>> AFAIK there's single version of this 10/100 MAC.
>> It doesn't have any identification registers.
>
> Since this is an IP block that people can modify due to its open
> source nature, it would have been good to define a revision register
> or such which would allow software to gate specific code based on that
> revision.

Probably yes, though I haven't heard of any modified versions of this MAC
out there.

[...]

>>>> +Examples:
>>>> +
>>>> +       enet0: ethoc@...30000 {
>>>> +               compatible = "opencores,ethoc";
>>>> +               reg = <0xfd030000 0x4000 0xfd800000 0x4000>;
>>>> +               interrupts = <1>;
>>>> +               local-mac-address = [00 50 c2 13 6f 00];
>>>> +               clock-frequency = <50000000>;
>>>> +               mii-mgmt-clock-frequency = <5000000>;
>
> 5Mhz management clock? Can't you make it work with the standard 2.5Mhz
> management clock? Is not there a risk not to be able to "talk" to some
> PHY chips out there which do not support > 2.5Mhz management clock?

Yes I can, it just didn't occur to me that there is a standard 2.5MHz setting.

> Since this is an ethoc specific property, should it be prefixed with "ethoc,"?

Is it worth keeping this parameter at all, or just always default to 2.5MHz?

-- 
Thanks.
-- Max
--
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