Re: [PATCH] Revert "serial: max310x: rework RX interrupt handling"

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Thu, Feb 18, 2021 at 07:51:27AM +0100, Thomas Petazzoni wrote:
> Hello,
> 
> On Thu, 18 Feb 2021 06:55:53 +0300
> Alexander Shiyan <shc_work@mail.ru> wrote:
> 
> > I wrote a little inaccurately, I did not mean a physical interface RS-485,
> > but rather a time-critical MODBUS protocol. (In our case it used on top on RS-485).
> 
> OK, so it's not about 232 vs 485.
> 
> > I do not know how best to solve this problem, it may be an additional parameter
> > for the devicetree, but in this case it is not clear how to manage it if the
> > devicetree is not used ...
> 
> No, it cannot be a parameter in the Device Tree, as what we're talking
> about is not hardware description, but configuration of the hardware
> for particular use cases.
> 
> > This could be a Kconfig item (but something's not very good either).
> > Probably the best solution is to adapt some kind of IOCTL (or control via SYSFS).
> 
> Greg, Jiri, perhaps you could comment on what would be the appropriate
> user-space interface to use or add to be able to configure such aspects
> of a UART controller ?

What aspects need configuring and why is this uart so unique from all
others that it can't use the normal configuration methods?

thanks,

greg k-h