On Tuesday 16 August 2011 10:44:35 sdharia@xxxxxxxxxxxxxx wrote: > > > > SLIMbus is a MIPI standard bus primarily used for digital audio devices. > > The devices on the bus SLIMbus enumerate themselves by sending an > > IDENTITY message. I'll let Sagar clarify further. > > Thanks everyone for taking your time to review the RFC. > Regarding device discovery: > Every device sends a "PRESENT" message when it comes up. Every device has > 48-bit address like Ethernet and spec lets upto 256 devices (each getting > 8-bit logical address) on one bus. > The device can report anytime (when it's plugged in, when a dynamic module > powers it on etc.) > Typical use case will be to have it board-specific but as Mark > mentioned,we may have plug-in cards with slimbus devices so we want > dynamic support as well. Thanks for the info. The part that I still don't understand is how the 48-bit address and the 8 bit address are chosen. Do you mean that the 8-bit address identifies the location on the bus and is used when talking to the device locally while the 48-bit address is globally unique and different for each individual board? In that case, we would still not have any way to identify the type of device, other than using a look-up table of 8-bit addresses to device names (or numbers). Or does the 48-bit number actually tell us something about what device we're talking to, e.g. 24 bit vendor plus 24 bit device type and revision or such. If that's the case, the number needs to be the primary key that gets used to identify the driver, just like we do it in case of USB or PCI devices. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
