On 30.01.2015 11:31, Jean-Francois Moine wrote:

On Fri, 30 Jan 2015 10:44:07 +0100
Sebastian Hesselbarth [off-list ref] wrote:

quoted

I had a closer look on the Compulab website of the SoM [1] and think
that we'll have to convert it to dove-cm-a510.dtsi and the baseboard
Gabriel is using (maybe SBC-A510 [2]).

I don't understand why the A510 contained in the cm-a510 should be
different from the one of the other boards (I just noticed a second
ethernet and a WiFi device - but, is the Compulab document up to date?).

It is not the SoM that is different, but the baseboard it is attached
to. So, the SoM makes a second layer of dtsi around the SoC but is not
sufficient for a board dts.

Regarding the on-SoM WiFi, that will be available on _any_ cm-a510
equipped to _any_ baseboard, so it can be enabled in the som.dtsi.

The second ethernet comes from a PCIe attached NIC, and as you already
said, we simply don't know (yet) if it is actually wired-up on Gabriel's
baseboard. If it is not wired-up on the baseboard, we definitely want
it disabled in DT, too.

If it is the same, the dove.dtsi should work (and it seems to work for
Gabriel).

Of course it does work for Gabriel but we don't want to exclusively
mainline Gabriel's setup. In the best case, we want to provide a
dove-cm-a510.dtsi that can be included in any baseboard somebody is
using.

The only difference with the cm-a510 is the presence or not of the
connectors. So, all the Dove devices could be enabled in the DT, and,
if some room is needed in the board, the .config could be adapted
removing the useless drivers and have a minimal kernel.

Adapting the .config and removing drivers is actually not an option.
IMHO, introducing DT was meant for a single multi-arch kernel that
can be shipped with common Linux distros. Therefore, DT is the place
you enable/disable available resources. You leave most of the SoC (and
SoM) nodes disabled as long as you cannot tell if there is a
corresponding connector available.

Sebastian
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