Re: [PATCH v2 0/2] serial: add KEBA UART driver

[Andy Shevchenko <andriy.shevchenko@intel.com>]

On Fri, Oct 17, 2025 at 04:42:07PM +0200, Gerhard Engleder wrote:
> First the serial subsystem is prepared to keep rs485 settings from the
> driver if no firmware node exists. This enables drivers to configure a
> default rs485 mode, which is set by the serial subsystem.
> 
> Second the driver for the KEBA UART is added. This driver supports
> multiple rs485 modes and selects RS485 as default mode. This UART is
> found in KEBA PLC devices. The auxiliary devices for this driver are
> created by the cp500 driver.

I just realised (thanks, Lukas!) that this is for some kind of FPGA which makes
even bigger question here.

First of all, we have the FPGA framework, which handles (re-)configurations of
FPGAs. Second, why do you need a new driver when we have already one, i.e.
8250_dfl that follows some kind of standards?

Third, the expect approach is to see DT overlay provided along with the FPGA
configuration. So, basically your cp500.c should not have been existed to begin
with.

Can you elaborate on these considerations?

-- 
With Best Regards,
Andy Shevchenko