Hi guys, I want to hear you opinion before going ahead with this. These are ideas for small architectural changes to the OTG utility we currently have in Linux. The ideas I'm suggesting are these: Separate USB transceivers from the OTG utility This would clarify things. Now we have these "otg drivers" that deal with the controller and the transceiver. They are confusing and hard to maintain (the langwell_otg.c as an example). Usually the transceiver drivers are quite simple and the transceivers in most cases completely autonomous. In most cases they also don't have to deal with any of the OTG related tasks at all. If I remember correctly, Felipe already suggested this some time ago. Support for USB charging This is only an idea how I would do it. The utility has one usb_charger per transceiver and the chargers will implement a power supply. There are still issues that need to be addressed but nothing too bad. I'm sure that you guys agree that it's time we had the support for USB charging already. OTG state machine provided by the utility I'm quite sure that you agree that this is a good idea. There is nothing preventing us from doing it like this and there are so many benefits that come with it. We planned to implement a new platform independent driver for the ChipIdea UDC, the one with four drivers in Linux at the moment, and use these utilities with it. Since this is only adding new utility, old drivers don't need to be converted immediately. I already have several questions, but before asking them, I really would like to hear you are OK with this design. What do you guys think? Heikki Krogerus (2): usb: Add physical layer utility code usb: otg: OTG 2.0 state machine drivers/usb/otg/otg.c | 787 +++++++++++++++++++++++++++++++++++++++++++++++ drivers/usb/otg/phy.c | 376 ++++++++++++++++++++++ include/linux/usb/otg.h | 120 +++++++ include/linux/usb/phy.h | 227 ++++++++++++++ 4 files changed, 1510 insertions(+), 0 deletions(-) create mode 100644 drivers/usb/otg/phy.c create mode 100644 include/linux/usb/phy.h -- 1.7.4.1 -- 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
