Documentation/hwmon/ucd9200.rst

Source file repositories/reference/linux-study-clean/Documentation/hwmon/ucd9200.rst

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Documentation/hwmon/ucd9200.rst
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Support Tooling And Documentation
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Support Tooling And Documentation: documentation
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Kernel driver ucd9200
=====================

Supported chips:

  * TI UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248

    Prefixes: 'ucd9220', 'ucd9222', 'ucd9224', 'ucd9240', 'ucd9244', 'ucd9246',
    'ucd9248'

    Addresses scanned: -

    Datasheets:

	- http://focus.ti.com/lit/ds/symlink/ucd9220.pdf
	- http://focus.ti.com/lit/ds/symlink/ucd9222.pdf
	- http://focus.ti.com/lit/ds/symlink/ucd9224.pdf
	- http://focus.ti.com/lit/ds/symlink/ucd9240.pdf
	- http://focus.ti.com/lit/ds/symlink/ucd9244.pdf
	- http://focus.ti.com/lit/ds/symlink/ucd9246.pdf
	- http://focus.ti.com/lit/ds/symlink/ucd9248.pdf

Author: Guenter Roeck <linux@roeck-us.net>


Description
-----------

[From datasheets] UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and
UCD9248 are multi-rail, multi-phase synchronous buck digital PWM controllers
designed for non-isolated DC/DC power applications. The devices integrate
dedicated circuitry for DC/DC loop management with flash memory and a serial
interface to support configuration, monitoring and management.

This driver is a client driver to the core PMBus driver. Please see
Documentation/hwmon/pmbus.rst for details on PMBus client drivers.


Usage Notes
-----------

This driver does not auto-detect devices. You will have to instantiate the
devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
details.


Platform data support
---------------------

The driver supports standard PMBus driver platform data. Please see
Documentation/hwmon/pmbus.rst for details.


Sysfs entries
-------------

The following attributes are supported. Limits are read-write; all other
attributes are read-only.

======================= ========================================================
in1_label		"vin".
in1_input		Measured voltage. From READ_VIN register.
in1_min			Minimum Voltage. From VIN_UV_WARN_LIMIT register.
in1_max			Maximum voltage. From VIN_OV_WARN_LIMIT register.
in1_lcrit		Critical minimum Voltage. VIN_UV_FAULT_LIMIT register.
in1_crit		Critical maximum voltage. From VIN_OV_FAULT_LIMIT
			register.
in1_min_alarm		Voltage low alarm. From VIN_UV_WARNING status.
in1_max_alarm		Voltage high alarm. From VIN_OV_WARNING status.
in1_lcrit_alarm		Voltage critical low alarm. From VIN_UV_FAULT status.

Annotation

Implementation Notes