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diff --git a/Documentation/i2c/busses/i2c-ali1535.rst b/Documentation/i2c/busses/i2c-ali1535.rst new file mode 100644 index 0000000000..6941064730 --- /dev/null +++ b/Documentation/i2c/busses/i2c-ali1535.rst @@ -0,0 +1,45 @@ +========================= +Kernel driver i2c-ali1535 +========================= + +Supported adapters: + * Acer Labs, Inc. ALI 1535 (south bridge) + + Datasheet: Now under NDA + http://www.ali.com.tw/ + +Authors: + - Frodo Looijaard <frodol@dds.nl>, + - Philip Edelbrock <phil@netroedge.com>, + - Mark D. Studebaker <mdsxyz123@yahoo.com>, + - Dan Eaton <dan.eaton@rocketlogix.com>, + - Stephen Rousset<stephen.rousset@rocketlogix.com> + +Description +----------- + +This is the driver for the SMB Host controller on Acer Labs Inc. (ALI) +M1535 South Bridge. + +The M1535 is a South bridge for portable systems. It is very similar to the +M15x3 South bridges also produced by Acer Labs Inc. Some of the registers +within the part have moved and some have been redefined slightly. +Additionally, the sequencing of the SMBus transactions has been modified to +be more consistent with the sequencing recommended by the manufacturer and +observed through testing. These changes are reflected in this driver and +can be identified by comparing this driver to the i2c-ali15x3 driver. For +an overview of these chips see http://www.acerlabs.com + +The SMB controller is part of the M7101 device, which is an ACPI-compliant +Power Management Unit (PMU). + +The whole M7101 device has to be enabled for the SMB to work. You can't +just enable the SMB alone. The SMB and the ACPI have separate I/O spaces. +We make sure that the SMB is enabled. We leave the ACPI alone. + + +Features +-------- + +This driver controls the SMB Host only. This driver does not use +interrupts. |