[linux-2.6-block.git] / Documentation / i2c / busses / i2c-ismt.rst

======================
Kernel driver i2c-ismt
======================


Supported adapters:
  * Intel S12xx series SOCs

Authors:
	Bill Brown <bill.e.brown@intel.com>


Module Parameters
-----------------

* bus_speed (unsigned int)

Allows changing of the bus speed.  Normally, the bus speed is set by the BIOS
and never needs to be changed.  However, some SMBus analyzers are too slow for
monitoring the bus during debug, thus the need for this module parameter.
Specify the bus speed in kHz.

Available bus frequency settings:

  ====   =========
  0      no change
  80     kHz
  100    kHz
  400    kHz
  1000   kHz
  ====   =========


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

The S12xx series of SOCs have a pair of integrated SMBus 2.0 controllers
targeted primarily at the microserver and storage markets.

The S12xx series contain a pair of PCI functions.  An output of lspci will show
something similar to the following::

  00:13.0 System peripheral: Intel Corporation Centerton SMBus 2.0 Controller 0
  00:13.1 System peripheral: Intel Corporation Centerton SMBus 2.0 Controller 1
Commit	Line	Data
ccf988b6	1	======================
13f35ac1	2	Kernel driver i2c-ismt
ccf988b6 MCC	3	======================
ccf988b6 MCC	4
13f35ac1 NH	5
	6	Supported adapters:
	7	* Intel S12xx series SOCs
	8
	9	Authors:
	10	Bill Brown <bill.e.brown@intel.com>
	11
	12
	13	Module Parameters
	14	-----------------
	15
	16	* bus_speed (unsigned int)
ccf988b6	17
13f35ac1 NH	18	Allows changing of the bus speed. Normally, the bus speed is set by the BIOS
	19	and never needs to be changed. However, some SMBus analyzers are too slow for
	20	monitoring the bus during debug, thus the need for this module parameter.
	21	Specify the bus speed in kHz.
ccf988b6	22
13f35ac1	23	Available bus frequency settings:
ccf988b6 MCC	24
	25	==== =========
	26	0 no change
	27	80 kHz
	28	100 kHz
	29	400 kHz
	30	1000 kHz
	31	==== =========
13f35ac1 NH	32
	33
	34	Description
	35	-----------
	36
	37	The S12xx series of SOCs have a pair of integrated SMBus 2.0 controllers
	38	targeted primarily at the microserver and storage markets.
	39
	40	The S12xx series contain a pair of PCI functions. An output of lspci will show
ccf988b6	41	something similar to the following::
13f35ac1 NH	42
	43	00:13.0 System peripheral: Intel Corporation Centerton SMBus 2.0 Controller 0
	44	00:13.1 System peripheral: Intel Corporation Centerton SMBus 2.0 Controller 1