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From: George Hilliard <>
To: Greg Kroah-Hartman <>
Cc: George Hilliard <>,,,
	NXP Linux Team <>,
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: <> (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(-)


             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

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