lkml.org 
[lkml]   [2021]   [Feb]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [PATCH v3 5/5] serial: 8250_dw: add em485 support
    From
    Date
    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@micronovasrl.com>
    >>>>
    >>>> 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

    MICRONOVA SRL
    Sede: Via A. Niedda 3 - 35010 Vigonza (PD)
    Tel. 049/8931563 - Fax 049/8931346
    Cod.Fiscale - P.IVA 02663420285
    Capitale Sociale € 26.000 i.v.
    Iscritta al Reg. Imprese di Padova N. 02663420285
    Numero R.E.A. 258642

    \
     
     \ /
      Last update: 2021-02-05 19:55    [W:4.225 / U:0.216 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site