Messages in this thread | | | Subject | Re: [PATCH v3 5/5] serial: 8250_dw: add em485 support | From | Giulio Benetti <> | Date | Fri, 5 Feb 2021 18:46:56 +0100 |
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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
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