Fw: Help with SPI node

Fw: Help with SPI node

[Ravi Shekhar]

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 I'm attempting to get SPI to work on my embedded design
 that is based on the mpc8313erbd reference board wiht a
 2.6.27 kernel.  I cannot open the SPI device.
 Tracing through the kernel code, it looks like the device is
 not being found in the DTB file.  However there is a
 SPI node in there already described.  Our boards is a
 SPI master, and the device we will attach is a SPI
 slave.  Could someone elaborate on what is needed in
 the DTS file to have our SPI driver work and respond to an
 open() call?


Thanks 
  -Ravi

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Re: Fw: Help with SPI node

[Grant Likely]

On Mon, Nov 9, 2009 at 8:36 PM, Ravi Shekhar <Ravi.Shekhar@lntemsys.com> wr=
ote:
>
>
> =A0I'm attempting to get SPI to work on my embedded design
> =A0that is based on the mpc8313erbd reference board wiht a
> =A02.6.27 kernel.

Are you able to use a more recent kernel?  A lot of work has gone into
SPI drivers in the last 5 releases.

> =A0I cannot open the SPI device.
> =A0Tracing through the kernel code, it looks like the device is
> =A0not being found in the DTB file. =A0However there is a
> =A0SPI node in there already described. =A0Our boards is a
> SPI master, and the device we will attach is a SPI
> =A0slave. =A0Could someone elaborate on what is needed in
> =A0the DTS file to have our SPI driver work and respond to an
> =A0open() call?

Look in Documentation/powerpc/dts-bindings/spi-bus.txt.  However, the
2.6.27 kernel may not have support for that binding on the mpc8313 SPI
bus driver (I'm not sure though, I haven't looked).

g.

--=20
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.