Kernel-3.10.0-957.el7_pwm-beeper published: 2021-03-13 updated: 2021-03-13 Kernel_3.10.0-957.el7_内核文档 PWM beeper device tree bindings Registers a PWM device as beeper. Required properties: compatible: should be “pwm-beeper” pwms: phandle to the physical PWM device