From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: linux-gpio@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
linux-kernel@vger.kernel.org,
Wolfram Sang <wsa+renesas@sang-engineering.com>
Subject: [PATCH v5 0/1] gpio: add simple logic analyzer using polling
Date: Tue, 23 Nov 2021 17:49:01 +0100 [thread overview]
Message-ID: <20211123164902.35370-1-wsa+renesas@sang-engineering.com> (raw)
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
next reply other threads:[~2021-11-23 16:49 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-23 16:49 Wolfram Sang [this message]
2021-11-23 16:49 ` [PATCH v5 1/1] gpio: add sloppy logic analyzer using polling Wolfram Sang
2021-11-23 18:45 ` Andy Shevchenko
2021-11-23 18:47 ` Andy Shevchenko
2021-12-18 9:40 ` Wolfram Sang
2021-12-19 11:04 ` Andy Shevchenko
2021-12-19 13:09 ` Wolfram Sang
2021-11-24 0:35 ` Linus Walleij
2021-12-10 11:18 ` Wolfram Sang
2021-11-24 11:47 ` Bartosz Golaszewski
2021-11-24 20:12 ` Wolfram Sang
2021-11-30 10:37 ` Geert Uytterhoeven
2021-12-10 10:16 ` Wolfram Sang
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