Hello, I have taken another look at the implementation of the function “ep93xx_keypad_probe”. A software analysis approach points the following source code out for further development considerations. https://elixir.bootlin.com/linux/v5.6.3/source/drivers/input/keyboard/ep93xx_keypad.c#L252 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/input/keyboard/ep93xx_keypad.c?id=f5e94d10e4c468357019e5c28d48499f677b284f#n252 keypad->irq = platform_get_irq(pdev, 0); if (!keypad->irq) { err = -ENXIO; goto failed_free; } The software documentation is providing the following information for the used programming interface. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/base/platform.c?id=f5e94d10e4c468357019e5c28d48499f677b284f#n221 https://elixir.bootlin.com/linux/v5.6.3/source/drivers/base/platform.c#L202 “… * Return: IRQ number on success, negative error number on failure. …” Would you like to reconsider the shown condition check? Regards, Markus
