[06/10,V2] spi: Add SPI driver for mx233/mx28

[Marek Vasut]

Dear Guenter Roeck,

> On Wed, Aug 01, 2012 at 11:16:15AM +0530, Shubhrajyoti Datta wrote:
> > On Wed, Aug 1, 2012 at 10:59 AM, Guenter Roeck <linux at roeck-us.net> wrote:
> > > On Wed, Aug 01, 2012 at 07:00:54AM +0200, Marek Vasut wrote:
> > >> Dear Shawn Guo,
> > >> 
> > >> > On Tue, Jul 31, 2012 at 08:35:59PM -0700, Guenter Roeck wrote:
> > >> > > I think the call to spi_master_put() triggers the call to
> > >> > > spi_master_release(). If so, kfree() would not be needed at all,
> > >> > > and the documentation is wrong.
> > >> > 
> > >> > Also those drivers calling kfree in probe.
> > >> 
> > >> Looks like that to me ...
> > > 
> > > Doesn't seem to be far spread, fortunately. Only spi-davinci.c,
> > > spi-imx.c, and spi-omap2-mcspi.c
> > 
> > I have a  omapsdp I could patch spi-omap2-mcspi.c  file thanks for the
> > catch.
> 
> For that it would be good to determine if there is a memory leak when
> removing the driver (I don't see where the memory allocated with
> spi_alloc_master is removed).

When the refcounting for the device reaches 0, it's deallocated. (Aka _put long 
enough and it'll disappear)

> Thanks,
> Guenter

Best regards,
Marek Vasut