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From: Tom Burkart <>
To: Linux kernel mailing list <>
Cc: Tom Burkart <>
Subject: [PATCH v7 0/4] PPS: pps-gpio PPS ECHO implementation
Date: Wed, 14 Nov 2018 23:54:28 +1100	[thread overview]
Message-ID: <> (raw)

Hi all,
please find attached the PPS-GPIO PPS ECHO implementation patch. The
driver claims to have echo functionality in the sysfs interface but this
functionality is not present.  This patch provides this functionality.

Parts 1 and 2 of the patch change the original driver from the number
based GPIO ABI to the descriptor based ABI.  This has been modified
to not break backward compatibility.

Parts 3 and 4 then add the PPS ECHO functionality.  This is enabled if a
"echo-gpios" entry is found in the devicetree.

Changes in v4:
There is a bugfix in part 2 that was returning an uninitialised variable
and juggling some code that speeds up the probe by not running code when
not using PPS ECHO.

Changes in v5:
Meet all requirements of checkpatch

Changes in v6:
Cosmetic changes to code layout

Changes in v7:
Also accept the DEPRECATED "gpios" devicetree entry to ensure backward

On the linuxpps mailing list it was suggested to use a hrtimer for
resetting the GPIO ECHO active state to the inactive state.
Please also comment on whether a hrtimer is necessary/desirable for the
purpose of resetting the echo pin active state.  I am happy to implement
it if there is a need.

Please install, test and comment as it is now a quite major change to
the driver.
Please do send suggestions for improvement.

Tom Burkart

Tom Burkart (4):
  dt-bindings: pps: descriptor-based gpio, capture-clear addition
  pps: descriptor-based gpio, capture-clear addition
  dt-bindings: pps: pps-gpio PPS ECHO implementation
  pps: pps-gpio pps-echo implementation

 Documentation/devicetree/bindings/pps/pps-gpio.txt |  17 +-
 drivers/pps/clients/pps-gpio.c                     | 225 +++++++++++++++++----
 include/linux/pps-gpio.h                           |   6 +-
 3 files changed, 203 insertions(+), 45 deletions(-)


             reply	other threads:[~2018-11-14 12:55 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-14 12:54 Tom Burkart [this message]
2018-11-14 12:54 ` [PATCH v7 1/4] dt-bindings: pps: descriptor-based gpio, capture-clear addition Tom Burkart
2018-11-14 12:54   ` [PATCH v7 2/4] " Tom Burkart
2018-11-14 12:54     ` [PATCH 3/4] dt-bindings: pps: pps-gpio PPS ECHO implementation Tom Burkart
2018-11-14 12:54       ` [PATCH v7 4/4] pps: pps-gpio pps-echo implementation Tom Burkart
2018-11-16 22:49   ` [PATCH v7 1/4] dt-bindings: pps: descriptor-based gpio, capture-clear addition Rob Herring
2018-11-17 10:35     ` tom burkart
2018-11-17 14:22       ` Rob Herring
2018-11-18  0:35         ` tom burkart
2018-11-26 19:39           ` Rob Herring
2018-11-27  3:57             ` tom burkart
2018-11-28 17:13               ` Rob Herring
2018-11-29  0:29                 ` tom burkart
2018-11-29  2:05                 ` tom burkart
2018-11-29 18:00                   ` Rob Herring
2018-12-01 22:24                     ` tom burkart

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