From: George Hilliard <ghilliard@kopismobile.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: George Hilliard <ghilliard@kopismobile.com>,
linux-serial@vger.kernel.org, devicetree@vger.kernel.org,
NXP Linux Team <linux-imx@nxp.com>,
kernel@pengutronix.de
Subject: [PATCH v3 0/2] Implement support for inverted serial TX/RX on i.MX
Date: Wed, 12 Feb 2020 10:35:36 -0600 [thread overview]
Message-ID: <20200212163538.3006-1-ghilliard@kopismobile.com> (raw)
This peripheral has dedicated control bits that flip input/output
signals before handing them off to the OS. This is useful on my
hardware because the UART is connected to an RS-422 transceiver with the
+/- pins hooked up backward. Instead of a hack flipping all the bits
before sending them, the hardware can do it for free.
Revision 3 sets *and* clears the bit as necessary during startup. It
also moves init before transmit is enabled.
George Hilliard (2):
dt-bindings: serial: document fsl,inverted-tx and -rx options
tty: imx serial: Implement support for reversing TX and RX polarity
.../bindings/serial/fsl-imx-uart.txt | 4 +++
drivers/tty/serial/imx.c | 29 +++++++++++++++----
2 files changed, 27 insertions(+), 6 deletions(-)
--
2.25.0
next reply other threads:[~2020-02-12 16:35 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 16:35 George Hilliard [this message]
2020-02-12 16:35 ` [PATCH v3 1/2] dt-bindings: serial: document fsl,inverted-tx and -rx options George Hilliard
2020-02-18 23:07 ` Rob Herring
2020-02-12 16:35 ` [PATCH v3 2/2] tty: imx serial: Implement support for reversing TX and RX polarity George Hilliard
2020-02-12 20:47 ` Uwe Kleine-König
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200212163538.3006-1-ghilliard@kopismobile.com \
--to=ghilliard@kopismobile.com \
--cc=devicetree@vger.kernel.org \
--cc=gregkh@linuxfoundation.org \
--cc=kernel@pengutronix.de \
--cc=linux-imx@nxp.com \
--cc=linux-serial@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).