[PATCH v10 0/1] gpio: add simple logic analyzer using polling
From: Wolfram Sang
Date: Thu Jun 20 2024 - 05:42:40 EST
Changes since v9:
* add comment why late_initcall is used
* use .remove_new instead of .remove
* add needed includes
* use devm for allocating mutex
* remove stray ',' in compatible-array
* remove success message in probe()
Thank you everyone for the valuable feedback so far. Thing is, I am not
sure anymore if this is suitable for upstream. Maybe it is a tad too
hackish. v9 had some ideas for improvements (IIO interface, configfs
support) which I am not going to tackle. For me, it is (and has been)
useful as is, but I need to move on. The latest version of what I use
can be found here:
git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git renesas/topic/gpio-logic-analyzer
If someone wants to continue from here, I am all for it. If that thing
is useful or educational for someone, I am happy. And for those who
don't know what this is about, here is an old coverletter:
===
Here is 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.
And an eLinux-wiki page with a picture of a result is here:
https://elinux.org/Kernel_GPIO_Logic_analyzer
===
Wolfram Sang (1):
gpio: add sloppy logic analyzer using polling
.../dev-tools/gpio-sloppy-logic-analyzer.rst | 93 +++++
Documentation/dev-tools/index.rst | 1 +
drivers/gpio/Kconfig | 17 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-sloppy-logic-analyzer.c | 344 ++++++++++++++++++
tools/gpio/gpio-sloppy-logic-analyzer.sh | 246 +++++++++++++
6 files changed, 702 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.sh
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2.43.0