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| author | David Cohen <david.a.cohen@intel.com> | 2016-12-21 12:20:25 +0100 |
|---|---|---|
| committer | Chanwoo Choi <cw00.choi@samsung.com> | 2017-01-09 10:04:11 +0900 |
| commit | 2f556bdb9f2e3794722c0d9186db9799b35071c4 (patch) | |
| tree | 99da983bc7c52a9d839064f8c8c140a55718c1bf /Documentation/extcon | |
| parent | 5298b8365832e13158e41e205a31a9505eef4c94 (diff) | |
| download | linux-2f556bdb9f2e3794722c0d9186db9799b35071c4.tar.bz2 | |
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>
Diffstat (limited to 'Documentation/extcon')
| -rw-r--r-- | Documentation/extcon/intel-int3496.txt | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/extcon/intel-int3496.txt b/Documentation/extcon/intel-int3496.txt new file mode 100644 index 000000000000..af0b366c25b7 --- /dev/null +++ b/Documentation/extcon/intel-int3496.txt @@ -0,0 +1,22 @@ +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 |