[PATCH 2/3] spi: mediatek: Add spi bus for Mediatek MT8173

[Eddie Huang]

Hi Mark,

On Tue, 2015-06-09 at 11:39 +0100, Mark Brown wrote:
> On Tue, Jun 09, 2015 at 06:05:21PM +0800, Eddie Huang wrote:
> 
> > --- a/drivers/spi/spi.c
> > +++ b/drivers/spi/spi.c
> > @@ -539,8 +539,8 @@ static int __spi_map_msg(struct spi_master *master,
> > struct spi_message *msg)
> >         if (!master->can_dma)
> >                 return 0;
> 
> > -       tx_dev = master->dma_tx->device->dev;
> > -       rx_dev = master->dma_rx->device->dev;
> > +       tx_dev = master->dma_tx ? master->dma_tx->device->dev :
> > master->dev;
> > +       rx_dev = master->dma_rx ? master->dma_rx->device->dev : master-
> 
> > Is this what you want ? Actually, I don't like first one at all.
> 
> Not quite what I'd been thinking of - we can't just pick the device in
> the core safely, the device might be a MFD or have some other
> restriction that needs us to use a separate struct device.  However most
> of those cases are likely to point towards implementing a dmaengine
> device so probably the above will work for most cases and is fine.  Can
> you send a proper patch please?

Sure, we will send this with new MTK SPI driver, such that can verify
it.

> 
> Please don't use the ternery operator, though.
OK, will fix it

Eddie
Thanks