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extcon: int3496: Add Intel INT3496 ACPI device extcon driver

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Add an extcon driver for USB OTG ports controlled by an Intel INT3496
ACPI device (e.g. Baytrail, Cherrytrail devices).

Signed-off-by: David Cohen <[email protected]>
[[email protected]: Port to current kernel, cleanup, submit upstream]
[[email protected]: Add Documentation/extcon/intel-int3496.txt]
Signed-off-by: Hans de Goede <[email protected]>
Signed-off-by: Chanwoo Choi <[email protected]>
This commit is contained in:
David Cohen 2016-12-21 12:20:25 +01:00 • committed by Chanwoo Choi
commit 2f556bdb9f
4 changed files with 212 additions and 0 deletions
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22
Documentation/extcon/intel-int3496.txt Normal file
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Intel INT3496 ACPI device extcon driver documentation
-----------------------------------------------------
The Intel INT3496 ACPI device extcon driver is a driver for ACPI
devices with an acpi-id of INT3496, such as found for example on
Intel Baytrail and Cherrytrail tablets.
This ACPI device describes how the OS can read the id-pin of the devices'
USB-otg port, as well as how it optionally can enable Vbus output on the
otg port and how it can optionally control the muxing of the data pins
between an USB host and an USB peripheral controller.
The ACPI devices exposes this functionality by returning an array with up
to 3 gpio descriptors from its ACPI _CRS (Current Resource Settings) call:
Index 0: The input gpio for the id-pin, this is always present and valid
Index 1: The output gpio for enabling Vbus output from the device to the otg
port, write 1 to enable the Vbus output (this gpio descriptor may
be absent or invalid)
Index 2: The output gpio for muxing of the data pins between the USB host and
the USB peripheral controller, write 1 to mux to the peripheral
controller