[linux-block.git] / Documentation / hwmon / aspeed-pwm-tacho.rst

Kernel driver aspeed-pwm-tacho
==============================

Supported chips:
	ASPEED AST2400/2500

Authors:
	<jaghu@google.com>

Description:
------------
This driver implements support for ASPEED AST2400/2500 PWM and Fan Tacho
controller. The PWM controller supports upto 8 PWM outputs. The Fan tacho
controller supports up to 16 tachometer inputs.

The driver provides the following sensor accesses in sysfs:

=============== ======= =====================================================
fanX_input	ro	provide current fan rotation value in RPM as reported
			by the fan to the device.

pwmX		rw	get or set PWM fan control value. This is an integer
			value between 0(off) and 255(full speed).
=============== ======= =====================================================
Commit	Line	Data
2d7a548a JRN	1	Kernel driver aspeed-pwm-tacho
	2	==============================
	3
	4	Supported chips:
	5	ASPEED AST2400/2500
	6
	7	Authors:
	8	<jaghu@google.com>
	9
	10	Description:
	11	------------
	12	This driver implements support for ASPEED AST2400/2500 PWM and Fan Tacho
	13	controller. The PWM controller supports upto 8 PWM outputs. The Fan tacho
	14	controller supports up to 16 tachometer inputs.
	15
	16	The driver provides the following sensor accesses in sysfs:
	17
9e929c67	18	=============== ======= =====================================================
2d7a548a JRN	19	fanX_input ro provide current fan rotation value in RPM as reported
	20	by the fan to the device.
	21
	22	pwmX rw get or set PWM fan control value. This is an integer
	23	value between 0(off) and 255(full speed).
9e929c67	24	=============== ======= =====================================================