Dear David, I am going through the USB 1.0 OTG Suppliant specifications. I have noticed that the Specifications speak about the using the Both the OTG host and OTG Device being compliant to OTG Specifications. So, what it means to me is that both the device should be USB 2.0 Spec complaint.
So, The USB 1.1 Devices which are unaware of SRP & HNP cannot communicate with OTG HOSTs. Is this right or wrong? Please elaborate on this? Regards, Mukund Jampala > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:linux-usb-devel- > [EMAIL PROTECTED] On Behalf Of Mukund JB. > Sent: Monday, January 23, 2006 7:08 PM > To: David Brownell; linux-usb-devel@lists.sourceforge.net > Cc: Greg KH; Oliver Neukum > Subject: RE: [linux-usb-devel] USB Clarifications please ..... > > Dear David, > > > There are other interfaces for both full/low speed hosts ("USB 1.1" as > > well as "USB 2.0") and for high speed ones (only "USB 2.0"). Those > are > > common primarily because of PCs. Where gate count matters, silicon > > vendors may find it better to avoid "standard" register interfaces. > > > > I've used high speed hosts that aren't EHCI, and full/low speed ones > > that aren't OHCI or UHCI ... > > If that is the case, it will involve rewriting the complete USB stack > for that particular hardware. > > Can you provide me a link describing all the possible scenarios that can > exist when connecting two USB devices (covering cases like ... both are > OTG, one is OTG)? > > > The OTG hardware (and its driver) kicks in before drivers for either > > host or peripheral roles; so it's a lower level driver, not (as you > > drew it) a higher level one. > > Yes, right. I got a vague picture now. Thanks. > > > You need to read both the OTG 1.0a and USB 2.0 specs, as well as the > > specs for your host and peripheral controllers. > > Yes, I will do it. I do not have the hardware specs yet so, let me start > with USB specs first. > > > To the extent that > > your PHY is documented and accessible, you'll need to understand how > > that interacts with the controllers too. > > You mean how software interacts with the controller. > I got the isp1301_omap in drivers/i2c/chips/isp1301_omap.c > > Regards, > Mukund Jampala > > > > > ------------------------------------------------------- > This SF.net email is sponsored by: Splunk Inc. Do you grep through log > files > for problems? Stop! Download the new AJAX search engine that makes > searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! > http://sel.as-us.falkag.net/sel?cmd=k&kid3432&bid#0486&dat1642 > _______________________________________________ > linux-usb-devel@lists.sourceforge.net > To unsubscribe, use the last form field at: > https://lists.sourceforge.net/lists/listinfo/linux-usb-devel ------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Do you grep through log files for problems? Stop! Download the new AJAX search engine that makes searching your log files as easy as surfing the web. DOWNLOAD SPLUNK! http://sel.as-us.falkag.net/sel?cmd=lnk&kid3432&bid#0486&dat1642 _______________________________________________ linux-usb-devel@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
