On Tue, Oct 24, 2023 at 10:31:51AM -0400, Frank Li wrote: > On Tue, Oct 24, 2023 at 11:30:33AM +0200, Greg KH wrote: > > On Mon, Oct 23, 2023 at 12:26:42PM -0400, Frank Li wrote: > > > On Sat, Oct 21, 2023 at 07:02:40PM +0200, Greg KH wrote: > > > > Note, your subject line needs to change. > > > > > > > > On Fri, Oct 20, 2023 at 12:00:27PM -0400, Frank Li wrote: > > > > > In typical embedded Linux systems, UART consoles require at least two pins, > > > > > TX and RX. In scenarios where I2C/I3C devices like sensors or PMICs are > > > > > present, we can save these two pins by using this driver. Pins is crucial > > > > > > > > "Pins are crucial" > > > > > > > > > resources, especially in small chip packages. > > > > > > > > > > This introduces support for using the I3C bus to transfer console tty data, > > > > > effectively replacing the need for dedicated UART pins. This not only > > > > > conserves valuable pin resources but also facilitates testing of I3C's > > > > > advanced features, including early termination, in-band interrupt (IBI) > > > > > support, and the creation of more complex data patterns. Additionally, > > > > > it aids in identifying and addressing issues within the I3C controller > > > > > driver. > > > > > > > > But where is the serial data ending up at? Not a normal uart, what is > > > > on the other end? And do line settings mean anything here? > > > > > > Currently, it use slave i3c code. > > > https://lore.kernel.org/imx/20231018215809.3477437-1-Frank.Li@xxxxxxx/T/#t > > > > > > idealy build an i3c->usb dongle to bride it to usb acm. > > > > So no one has built such a thing yet to determine if any of this works? > > It is easy to proof concept by I3C slave code and USB gadget ACM, then pipe > two tty (ttyACM0 and ttySI3C0 together). So you have not actually tested this? why write a driver that no one is using? > Of we also can implement a USB to I3C class standard, base on this, reuse > this tty driver at host side. Is there a USB I3C standard? I see i3c descriptors assigned by the USB-IF, but haven't dug to see if there's more than that anywhere... thanks, greg k-h
