On Fri, Jan 13, 2012 at 10:08:01AM -0800, Greg KH wrote: > On Fri, Jan 13, 2012 at 09:44:16AM +0530, Chiranjeevi Velempati wrote: > > On 1/12/2012 11:40 PM, Greg KH wrote: > > >On Thu, Jan 12, 2012 at 09:46:41PM +0530, Chiranjeevi Velempati wrote: > > >>Hi all, > > >> > > >>We have hsic hub embedded on SOC to expose multiple downstream ports > > >>with hsic host. We are trying to add generic driver for this hsic > > >>hub to change the default configuration in addition > > >What is a "HSIC" hub? > > HSIC (High speed Inter Connect) hub is a standard SMSC hub that > > works on the HSIC bus. This Hub can be controlled using the I2C > > bus. We are adding support for controlling the hub using the I2C and > > we are looking for the placement of this driver. > > I'm confused, what does this have to do with USB? What is "SMSC"? What > types of devices hang off of this interconnect? Is this a totally new > bus type that would require a new driver, devices, and hence, a new > drivers/ subdirectory? >From what I heard, the HSIC "hub" shows up as a host controller (but over I2C instead of over PCI). It uses a software interface like EHCI, but it talks to USB devices with a different phy controller. It's basically a shrunk-down version of the standard USB host controller phy that's very low-power. It's meant to be used for USB devices that are internal to an embedded device like a smart phone or tablet. Does that description sound correct, Chiranjeevi? What sort of project is this for? I think the driver would be similar to other embedded EHCI hosts and should go into the drivers/usb/hosts/ directory. Sarah Sharp -- 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
