aspeed-pwm-tacho.rst 776 B

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  1. Kernel driver aspeed-pwm-tacho
  2. ==============================
  3. Supported chips:
  4. ASPEED AST2400/2500
  5. Authors:
  6. <jaghu@google.com>
  7. Description:
  8. ------------
  9. This driver implements support for ASPEED AST2400/2500 PWM and Fan Tacho
  10. controller. The PWM controller supports upto 8 PWM outputs. The Fan tacho
  11. controller supports up to 16 tachometer inputs.
  12. The driver provides the following sensor accesses in sysfs:
  13. =============== ======= =====================================================
  14. fanX_input ro provide current fan rotation value in RPM as reported
  15. by the fan to the device.
  16. pwmX rw get or set PWM fan control value. This is an integer
  17. value between 0(off) and 255(full speed).
  18. =============== ======= =====================================================