[PATCH 2/2 V3] MXS: Implement DMA support into mxs-i2c

Wolfram Sang w.sang at pengutronix.de
Mon Jul 16 06:21:51 EDT 2012


> > I am also still interested to check the runtime switching, but it might
> > take another month until I can really hack on it.
> Good, there is some bit that probably needs to be flipped to allow this 
> switching. I managed to get this working with SPI, not with i2c though. With 

Ah, hearing that it works with SPI is good news.

> i2c, if I restarted the controller inbetween each transaction, it worked ... 
> which is not what I'd like to see there.


> > > No, it doesn't. See above about small transfers. Consider the easy
> > > situation where you have sensor on one bus (so you do PIO because you
> > > transfer small data) and you have EEPROM on other bus, where you use DMA
> > > because you transfer large data. And the mixed mode isn't there yet.
> > 
> > I fully understand what you want to configure. I did before. Yet,
> > devicetree bindings are not platform_data and shouldn't be used like
> > them.
> But then, how would you configure this detail on a per-bus basis? Well all 

This is a question for devicetree-discuss.

> patch actually fixes a real issue, I'd like to have it in ASAP and it's been 
> aboue three months already, which sucks.

I am open to ideas improving the situation (which is: a lot more
patches, but not a lot more reviewers)



Pengutronix e.K.                           | Wolfram Sang                |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
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