On Wed, Sep 24, 2014 at 01:32:27PM +0300, Andy Shevchenko wrote: > On Wed, 2014-09-24 at 09:44 +0100, Mark Brown wrote: > > On Thu, Sep 18, 2014 at 08:08:52PM +0300, Andy Shevchenko wrote: > > > In case of DMA we never got things done until we enable both channels. In case > > > of receive only or send only mode the user has to provide a dummy buffer. > > The driver must never impose such requirements on clients, they > > shouldn't need to know about the quirks of the controller. There's > > support in the core providing dummy buffers for transmit and receive, > > you should use that (possibly extending it so the dummies are only > > provided for DMA). > Currently driver in case of receiving or sending only will never call > the xfer_done from DMA callback since we never will have counter equal > to 2. So, the driver already relies on duplex mode. Am I missing > something? Please re-read what I wrote above, especially the first phrase. You can't require that we rewrite essentialy every SPI driver on the off chance that it's used with this controller.
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