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Message-Id: <20211123164902.35370-1-wsa+renesas@sang-engineering.com>
Date: Tue, 23 Nov 2021 17:49:01 +0100
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: linux-gpio@...r.kernel.org
Cc: linux-renesas-soc@...r.kernel.org,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
linux-kernel@...r.kernel.org,
Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: [PATCH v5 0/1] gpio: add simple logic analyzer using polling
The bravery continues with the next update of the in-kernel logic
analyzer based on GPIO polling with local irqs disabled. It has been
tested locally and remotely. It provided satisfactory results. Besides
the driver, there is also a script which isolates a CPU to achieve the
best possible result. I am aware of the latency limitations. However,
the intention is for debugging only, not mass production. Especially for
remote debugging and to get a first impression, this has already been
useful. Documentation is within the patch, to get a better idea what
this is all about.
A branch is here:
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/gpio-logic-analyzer-v5
And an eLinux-wiki page with a picture of a result is here:
https://elinux.org/Kernel_GPIO_Logic_analyzer
Changes since last version:
* increased version number to 5 to match internal and external numbering
* added "SLOPPY" to the Kconfig symbol as well
* addressed Geert's comments (typos and more 'unsigned int' usage).
Thanks!
* addressed Andy's comments (updated comment, use dev_err_probe, use
'... || fail' pattern in script consequently). Thanks!
I've used the analyzer in a few more scenarios and on another SoC
(Renesas R-Car M3-W) and was happy with the outcome. Looking forward to
other tests and comments. From my side this is good to go.
Happy hacking,
Wolfram
Wolfram Sang (1):
gpio: add sloppy logic analyzer using polling
.../dev-tools/gpio-sloppy-logic-analyzer.rst | 71 ++++
Documentation/dev-tools/index.rst | 1 +
drivers/gpio/Kconfig | 17 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-sloppy-logic-analyzer.c | 340 ++++++++++++++++++
tools/gpio/gpio-sloppy-logic-analyzer | 222 ++++++++++++
6 files changed, 652 insertions(+)
create mode 100644 Documentation/dev-tools/gpio-sloppy-logic-analyzer.rst
create mode 100644 drivers/gpio/gpio-sloppy-logic-analyzer.c
create mode 100755 tools/gpio/gpio-sloppy-logic-analyzer
--
2.30.2
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