Supporting two SMSC9221 interfaces on GPMC in a dts

Supporting two SMSC9221 interfaces on GPMC in a dts

[Ash Charles]

Hi,

The Gumstix Tobi-Duo board has two SMSC9221 NICs attached to the GPMC
interface of an OMAP3.  I'm trying to figure out how best to include
both interfaces in the device tree file.
With just one interface, I can #include "omap-gpmc-smsc9221.dtsi", add
the extra board specific settings in to "ethernet@gpmc" in the board
file as well as any settings needed for the gpmc.

For two interfaces though, I can setup the gpmc details, configure one
"ethernet@gpmc" node as before but then, need to manually create (i.e.
copy the meat from the "omap-gpmc-smsc9221.dtsi") a second node.

This works but seems, well, verbose.  Is there a way to setup multiple
interfaces without having to duplicate the omap-gpmc-smsc9221.dtsi
content?

Any hints much appreciated!  Thanks,

--Ash

Re: Supporting two SMSC9221 interfaces on GPMC in a dts

[Tony Lindgren]

Hi,

Adding devicetree list to Cc as well if somebody has a good solution.

* Ash Charles <ashcharles-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> [150128 18:54]:
> Hi,
> 
> The Gumstix Tobi-Duo board has two SMSC9221 NICs attached to the GPMC
> interface of an OMAP3.  I'm trying to figure out how best to include
> both interfaces in the device tree file.
> With just one interface, I can #include "omap-gpmc-smsc9221.dtsi", add
> the extra board specific settings in to "ethernet@gpmc" in the board
> file as well as any settings needed for the gpmc.
>
> For two interfaces though, I can setup the gpmc details, configure one
> "ethernet@gpmc" node as before but then, need to manually create (i.e.
> copy the meat from the "omap-gpmc-smsc9221.dtsi") a second node.
 
Yeah I think this is how we did it for omap3-sbc-*.dts*.

> This works but seems, well, verbose.  Is there a way to setup multiple
> interfaces without having to duplicate the omap-gpmc-smsc9221.dtsi
> content?

Hmm I wonder if the "[PATCH] dtc: parser: Add label while overriding
nodes" would help with this too?

I agree it would be nice to be able to have device specific .dtsi
file that can be included multiple times for the most common devices.

Regards,

Tony
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Re: Supporting two SMSC9221 interfaces on GPMC in a dts

[Ash Charles]

On Thu, Jan 29, 2015 at 8:20 AM, Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org> wrote:
> Yeah I think this is how we did it for omap3-sbc-*.dts*.
>
>> This works but seems, well, verbose.  Is there a way to setup multiple
>> interfaces without having to duplicate the omap-gpmc-smsc9221.dtsi
>> content?
>
> Hmm I wonder if the "[PATCH] dtc: parser: Add label while overriding
> nodes" would help with this too?
>
> I agree it would be nice to be able to have device specific .dtsi
> file that can be included multiple times for the most common devices.
Thanks Tony.

For now, I'll follow the lead of omap3-sbc-*.dts* for now in lieu of
another technique suggestion.  The "[PATCH] dtc: parser: Add label
while overriding nodes" patch definitely looks promising so I'll watch
for that landing in hopes of testing it for this case.

--Ash
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