The beeper in the NSLU2 is just a GPIO connected to a speaker, so we need to use PWM on the GPIO to get any kind of sound out. Tested with some random beeps by enabling INPUT_EVDEV and running beep.c with e.g. beep 400 for a 400 Hz tone. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/20240627-ixp4xx-dts-v1-1-cdbbe1150873@linaro.org Link: https://lore.kernel.org/r/20240703-ixp4xx-dts-v1-1-e5149da36f6e@linaro.org Signed-off-by: Arnd Bergmann <arnd@arndb.de>
