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| author | Wolfram Sang <wsa+renesas@sang-engineering.com> | 2024-06-20 11:41:58 +0200 |
|---|---|---|
| committer | Bartosz Golaszewski <bartosz.golaszewski@linaro.org> | 2024-07-01 10:54:11 +0200 |
| commit | 7828b7bbbf2074dd7dd14d87f50bc5ce9036d692 (patch) | |
| tree | 4274f1036aab287eff744f22947dad42ee21d061 /drivers/gpio/Kconfig | |
| parent | 6a9c15083b1662a4b7b36e787272deb696d72c24 (diff) | |
| download | lwn-7828b7bbbf2074dd7dd14d87f50bc5ce9036d692.tar.gz lwn-7828b7bbbf2074dd7dd14d87f50bc5ce9036d692.zip | |
gpio: add sloppy logic analyzer using polling
This is a sloppy logic analyzer using GPIOs. It comes with a script to
isolate a CPU for polling. While this is definitely not a production
level analyzer, it can be a helpful first view when remote debugging.
Read the documentation for details.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240620094159.6785-2-wsa+renesas@sang-engineering.com
[Bartosz: moved the Kconfig entry into a different category]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Diffstat (limited to 'drivers/gpio/Kconfig')
| -rw-r--r-- | drivers/gpio/Kconfig | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig index dfb8dc850f3c..2b9bd1893863 100644 --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -1891,4 +1891,23 @@ config GPIO_SIM endmenu +menu "GPIO Debugging utilities" + +config GPIO_SLOPPY_LOGIC_ANALYZER + tristate "Sloppy GPIO logic analyzer" + depends on (GPIOLIB || COMPILE_TEST) && CPUSETS && DEBUG_FS && EXPERT + help + This option enables support for a sloppy logic analyzer using polled + GPIOs. Use the 'tools/gpio/gpio-sloppy-logic-analyzer' script with + this driver. The script will make it easier to use and will also + isolate a CPU for the polling task. Note that this is a last resort + analyzer which can be affected by latencies, non-deterministic code + paths, or NMIs. However, for e.g. remote development, it may be useful + to get a first view and aid further debugging. + + If this driver is built as a module it will be called + 'gpio-sloppy-logic-analyzer'. + +endmenu + endif |