Re: [PATCH v3 5/5] serial: 8250_dw: add em485 support

[Giulio Benetti]

Il 02/02/2021 12:22, Andy Shevchenko ha scritto:
> On Tue, Feb 02, 2021 at 01:31:17AM +0100, Giulio Benetti wrote:
> > Il 18/05/2020 17:21, Andy Shevchenko ha scritto:
> > > On Sun, May 17, 2020 at 11:56:10PM +0200, Heiko Stuebner wrote:
> > > > From: Giulio Benetti <giulio.benetti@xxxxxxxxxxxxxxxx>
> > > >
> > > > Need to use rs485 transceiver so let's use existing em485 485 emulation
> > > > layer on top of 8250.
> > > >
> > > > Add rs485_config callback to port and uses the standard em485 start and
> > > > stop helpers.
> > >
> > > Would it prevent to use native RS485 support?
> >
> > 8250_dw doesn't have a native RS485 support, do you mean using hardware
> > RTS assertion? Anyway at the moment it's not present. This would be the
> > first rs485 support added to 8250_dw.
>
> DW v4.0+ has it.

I have access to datasheet of DW v3, and I don't have access to hardware
with DW v4.0v Uart.
But I could add rs485emu for only UART version < 4.0 and I can find Uart
version by reading UCV register, would it be acceptable?

Best regards
--
Giulio Benetti
CTO

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