The bravery continues with the next update of the in-kernel logic analyzer based on GPIO polling with local irqs disabled. It has been 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. Changes since v1: * addressed Andy's review comments (thanks!) * mutex gets destroyed on remove * make use of the snprintf return value * improved errno * script: use only progname instead of $0 * script: refactor 'shift' usage in command line handling * spelling fixes * script: fixed a bug when using '--instance' * short success message after proper initialization I had a look at Andy's other suggestion, too, but decided against them. Either I liked the current style better or they can be added later when we actually need them. I've used the analyzer in a few more scenarios and was happy with the outcome. Looking forward to other tests and comments. From my side this looks 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 | 341 ++++++++++++++++++ tools/gpio/gpio-sloppy-logic-analyzer | 221 ++++++++++++ 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
