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ARM: dts: ixp4xx: nslu2: beeper uses PWM

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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>
This commit is contained in:
Linus Walleij 2024-07-03 15:23:41 +02:00 committed by Arnd Bergmann
parent 9289b97a67
commit 8b5d415c4f
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1 changed files with 9 additions and 2 deletions
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11
arch/arm/boot/dts/intel/ixp/intel-ixp42x-linksys-nslu2.dts
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@ -90,11 +90,18 @@ gpio-poweroff {
timeout-ms = <5000>;
};
gpio-beeper {
compatible = "gpio-beeper";
gpio_pwm: pwm {
#pwm-cells = <3>;
compatible = "pwm-gpio";
gpios = <&gpio0 4 GPIO_ACTIVE_HIGH>;
};
beeper {
compatible = "pwm-beeper";
pwms = <&gpio_pwm 0 1 0>;
beeper-hz = <1000>;
};
soc {
bus@c4000000 {
/* The first 16MB region at CS0 on the expansion bus */