Hi Linus, >> Currently, devices attached via a UART are not well supported in the >> kernel. The problem is the device support is done in tty line disciplines, >> various platform drivers to handle some sideband, and in userspace with >> utilities such as hciattach. > > Freaking *awesome* Rob, this really really needs to happen. > I'm very happy that you're driving this. > >> This is functional with minimal testing using the loopback driver and >> pl011 (w/o DMA) UART under QEMU (modified to add a DT node for the slave >> device). It still needs lots of work and polish. > > I have Bluetooth (HCI) over UART on the Nomadik and Ux500, > both with DMA support for the PL011 too. So I hope to be able > to utilize this. > > (The HCI transport is then used for GPS, FM radio and whatnot > but that is another issue.)
that is something we can already solve via regmap. We have started work on Intel LnP which also includes a FM radio chip where registers/interrupts are exposed via HCI commands/events. So fundamentally the Bluetooth HCI device would expose the GPS and FM radio nodes via regmap. Regards Marcel
