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 -- 2.43.0
