netdev - Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.

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Date:	Wed, 10 Aug 2011 12:26:17 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Robin Holt <holt@....com>
Cc:	Wood Scott-B07421 <B07421@...escale.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	U Bhaskar-B22300 <B22300@...escale.com>,
	"socketcan-core@...ts.berlios.de" <socketcan-core@...ts.berlios.de>,
	PPC list <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.

>>>>>>> So the node names should be
>>>>>>> 		can@...00 {
>>>>>>> 		can@...00 {
>>>>>>> correct?
>>>>>>> 
>>>>>> [Bhaskar] As there are two CAN controllers on P1010,So won't it be better
>>>>>> 	    to distinguish it by can0 and can1 instead by simple "can" ?
>>>>> 
>>>>> It looks like the way to do that is to assign a label to those devices
>>>>> and then associate the label with an alias.  I have no idea how that
>>>>> works under the hood, but it is the way other files are set up.  Take a
>>>>> look at arch/powerpc/boot/dts/bamboo.dts for how they define the serial
>>>>> interfaces.
>>>>> 
>>>>> Grant or Wolfgang, is that the right way to handle the concern about
>>>>> names or does it have no practical effect with the Linux kernel?
>>>> 
>>>> It has not effect.  The label is just if you need to reference it via some other means.
>>> 
>>> Does the alias have an effect?
>> 
>> nope
> 
> Then how does the device number get associated with a particular device

What do you mean by device number?

> and how is user-space ensured a consistent namespace?

that is left to udev rules.

- k--
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