linux-kernel - [PATCH 0/5] tty: add flag to suppress ready signalling on open

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Message-Id: <20201130153742.9163-1-johan@kernel.org>
Date:   Mon, 30 Nov 2020 16:37:37 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     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, Johan Hovold <johan@...nel.org>
Subject: [PATCH 0/5] tty: add flag to suppress ready signalling on open

This series adds a new 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. Such an interface is implemented
for serial core and USB serial.

The motivation for this is to allow for applications where the DTR and
RTS lines are used for non-standard purposes (e.g. generating power-on
and reset pulses) to open the port without undesirable side effects.

The final patches enables this flag by default for such a USB serial
device.

Greg, are you ok we me taking this through my tree? I'm planning on some
follow ups to the ftdi driver and the tty/serial changes are fairly
self-contained.

Johan

Johan Hovold (3):
  tty: add port flag to suppress ready signalling on open
  serial: core: add sysfs attribute to suppress ready signalling on open
  USB: serial: add sysfs attribute to suppress ready signalling on open

Mychaela N. Falconia (2):
  USB: serial: ftdi_sio: pass port to quirk port_probe functions
  USB: serial: ftdi_sio: add support for FreeCalypso DUART28C adapter

 Documentation/ABI/testing/sysfs-tty |  7 +++++
 drivers/tty/serial/serial_core.c    | 29 ++++++++++++++++++++
 drivers/tty/tty_port.c              |  2 +-
 drivers/usb/serial/bus.c            | 38 ++++++++++++++++++++++++--
 drivers/usb/serial/ftdi_sio.c       | 42 +++++++++++++++++++++++------
 drivers/usb/serial/ftdi_sio_ids.h   |  1 +
 include/linux/tty.h                 | 14 ++++++++++
 7 files changed, 122 insertions(+), 11 deletions(-)

-- 
2.26.2