Re: McSPI interfaces in newer kernel

[Kevin Hilman <khilman@mvista.com>]

"Meng Hu" <meng.hu@gmail.com> writes:

> I am trying to jump from a 2.6.10 montavista kernel to a 2.6.21 one
> for OMAP2430.
> There are some patches from MonvaVista(originally provided by TI) for
> the 2.6.10 kernel which provides some McSPI  implementations, e.g.
> drivers/ssi/omap-mcspi.c
>
> I found that these files are not in my 2.6.21 kernel and neither in
> the upstream omap linux tree.

For the MV 2.6.21-based kernel, we moved from using the TI SPI driver
to the upstream driver (drivers/spi/omap2_mcspi.c)

> Is this because the upstream kernel only contains a small set of omap
> drivers OR these old mscpi drivers are replaced by sth. else?

The "old" driver you're referring to was never upstream, it's only in
the TI kernel (and re-used in the MV kernel.)  For the MV 2.6.21-based
kernel, since there was an upstream driver, we moved to the upstream
driver.

There are many drivers/features which are in the TI kernels which are
not in the upstream kernels.  Feel free to help us all remedy that.
Patches are welcome.  :)

> Should I port these files by myself? or change my other drivers to use
> the new interfaces. (I am porting a touchscreen driver which heavily
> relies on the old mscpi drivers)

I would recommend you use the new driver.  If there is any
functionality in the older driver that is not in the newer one, I
recommend you report it here, preferably with a patch that adds it to
the new driver.  :)

Kevin