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authorDavid Cohen <david.a.cohen@intel.com>2016-12-21 12:20:25 +0100
committerChanwoo Choi <cw00.choi@samsung.com>2017-01-09 10:04:11 +0900
commit2f556bdb9f2e3794722c0d9186db9799b35071c4 (patch)
tree99da983bc7c52a9d839064f8c8c140a55718c1bf /Documentation/extcon
parent5298b8365832e13158e41e205a31a9505eef4c94 (diff)
extcon: int3496: Add Intel INT3496 ACPI device extcon driver
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 <david.a.cohen@intel.com> [hdgoede@redhat.com: Port to current kernel, cleanup, submit upstream] [hdgoede@redhat.com: Add Documentation/extcon/intel-int3496.txt] Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
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diff --git a/Documentation/extcon/intel-int3496.txt b/Documentation/extcon/intel-int3496.txt
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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