[PATCH v3 5/6] spi: at91-usart: add driver for at91-usart as spi

[Radu Pirea]

On Mon, 2018-05-14 at 20:38 +0300, Andy Shevchenko wrote:
> First of all, do not remove mailing lists from Cc and people if you
> are not sure they do not need your stuff.
> 
Sorry. My mistake. 
> On Mon, May 14, 2018 at 11:11 AM, Radu Pirea
> <radu.pirea at microchip.com> wrote:
> > On Sun, 2018-05-13 at 16:33 +0300, Andy Shevchenko wrote:
> > > On Fri, May 11, 2018 at 1:38 PM, Radu Pirea <radu.pirea at microchip
> > > .com
> > > > wrote:
> > > > +static void at91_usart_spi_cleanup(struct spi_device *spi)
> > > > +{
> > > > +       struct at91_usart_spi_device *ausd = spi-
> > > > >controller_state;
> > > > +
> > > > +       if (!ausd)
> > > > +               return;
> > > 
> > > Is it even possible?
> > 
> > Theoretically yes.
> 
> I would like to know real circumstances when it might happen.
That check was used in debug stage of driver. I will remove.
> 
> > > 
> > > Anyway the code below will work fine even if it's the case.
> > > 
> > > > +
> > > > +       spi->controller_state = NULL;
> > > > +       kfree(ausd);
> > > > +}
> > > The question is, why you didn't utilize what SPI core provides
> > > you?
> > 
> > I tried, but it did not work the way I expected.
> 
> So, what is not going as expected in "SPI core takes care of CSs"
> case?
> Did you use oscilloscope for that?
Yes, I used and CSs was not asserted. Anyway, I will will try again.
>