Hi, On Tue, Nov 29, 2011 at 01:42:56PM +0100, Matthieu CASTET wrote: > > My goal on top of have the PHY split from OTG, is to have generic OTG > > stage machine as part of the OTG utility. This would be useful > > initially with the various ChipIdea UDC drivers that all seem to have > > the OTG state machine implemented separately, the Marvell one being > > the last to do this. The idea is to implement support for this generic > > state machine for the ci13xxx_udc, that we are planning to make the > > only driver for all the users of the ChipIdea UDC. > > Are you planning to improve ci13xxx_udc ? > AFAIK ci13xxx_udc lacks some features that are implemented by other drivers. > For example the fsl one handle endianness. There were couple of reasons why we started looking at ci13xxx_udc. I just liked the name :). It's referring to the USB IP and not to a platform. Alexander Shishkin is looking at the drivers, so he should answer to this one. I think we need to start separate discussion about this work. There have now been many guys interested in this, which is nice, as this really needs to be done already. > Also it could be interesting to benchmark all the existing drivers to see which > one is better. In the old days ci13xxx_udc was very slow. Alexander did test that langwell_udc is much faster, so if we continue to use ci13xxx_udc, there is a whole lot of optimization to do, but this will require a lot of work in any case. > Also don't forget that there are different version of the core. For example > ci13xxx_udc doesn't support older core that doesn't have USBADRA. See > http://marc.info/?l=linux-usb&m=129906859817430&w=2 It may be that ci13xxx_udc is the wrong choice. Thanks, -- heikki -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
