On Mon, Jan 20, 2014 at 10:05:30AM +0000, Russell King - ARM Linux wrote: > On Mon, Jan 20, 2014 at 02:32:34PM +0530, Tushar Behera wrote: > > uart_register_driver call binds the driver to a specific device > > node through tty_register_driver call. This should typically happen > > during device probe call. > > > > In a multiplatform scenario, it is possible that multiple serial > > drivers are part of the kernel. Currently the driver registration fails > > if multiple serial drivers with same default major/minor numbers are > > included in the kernel. > > > > A typical case is observed with amba-pl011 and samsung-uart drivers. > > The samsung-uart driver is at fault here - the major/minor numbers were > officially registered to amba-pl011. Samsung needs to be fixed properly. I agree, the Samsung driver is "broken" here, but that's no reason why these two drivers can't register with the tty layer _after_ the hardware is detected, and not before. That saves resources on systems that build the drivers in, yet do not have the hardware present, which is always a good thing. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
