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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
- ======= =====================================================================
- There is a mapping between indices and GPIO connection IDs as follows
- ======= =======
- id index 0
- vbus index 1
- mux index 2
- ======= =======
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