linux-kernel - Re: [PATCH 1/5] tty: add port flag to suppress ready signalling on open

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Message-ID: <CA+uuBqZRyEw_YtNH7V2cSWhpLdKXWLgivkSbR6HqaLeH5CUaJg@mail.gmail.com>
Date:   Mon, 30 Nov 2020 15:36:09 -0800
From:   Mychaela Falconia <mychaela.falconia@...il.com>
To:     Johan Hovold <johan@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        "Mychaela N . Falconia" <falcon@...ecalypso.org>,
        linux-serial@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/5] tty: add port flag to suppress ready signalling on open

> Add a NORDY port flag to suppress raising the modem-control lines on
> open to signal DTE readiness.
>
> This can be used to implement a NORDY termios control flag to complement
> HUPCL, which controls lowering of the modem-control lines on final
> close.
>
> Initially drivers can export the flag through sysfs, which also allows
> control over the lines on first open.
>
> This can be use to prevent undesirable side-effects on open for
> applications where the DTR and RTS lines are used for non-standard
> purposes such as generating power-on and reset pulses.
>
> Signed-off-by: Johan Hovold <johan@...nel.org>

Reviewed-by: Mychaela N. Falconia <falcon@...ecalypso.org>