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docs: extcon: convert it to ReST and move to ACPI dir

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The intel-int3496.txt file is a documentation for an ACPI driver.

There's no reason to keep it on a separate directory.

So, instead of keeping it on some random location, move it
to a sub-directory inside the ACPI documentation dir,
renaming it to .rst.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Mauro Carvalho Chehab
2019-06-28 09:20:37 -03:00
committed by Rafael J. Wysocki
parent 9fe51603d9
commit 5d8cbf7176
3 changed files with 14 additions and 7 deletions
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33
Documentation/firmware-guide/acpi/extcon-intel-int3496.rst Normal file
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@@ -0,0 +1,33 @@
=====================================================
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
======= =====================================================================
There is a mapping between indices and GPIO connection IDs as follows
======= =======
id index 0
vbus index 1
mux index 2
======= =======

1
Documentation/firmware-guide/acpi/index.rst
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@@ -24,3 +24,4 @@ ACPI Support
acpi-lid
lpit
video_extension
extcon-intel-int3496