diff options
Diffstat (limited to 'Documentation/firmware-guide')
4 files changed, 37 insertions, 3 deletions
diff --git a/Documentation/firmware-guide/acpi/enumeration.rst b/Documentation/firmware-guide/acpi/enumeration.rst index 850be9696931..0a72b6321f5f 100644 --- a/Documentation/firmware-guide/acpi/enumeration.rst +++ b/Documentation/firmware-guide/acpi/enumeration.rst @@ -316,7 +316,7 @@ specifies the path to the controller. In order to use these GPIOs in Linux we need to translate them to the corresponding Linux GPIO descriptors. There is a standard GPIO API for that and is documented in -Documentation/gpio/. +Documentation/admin-guide/gpio/. In the above example we can get the corresponding two GPIO descriptors with a code like this:: @@ -339,7 +339,7 @@ a code like this:: There are also devm_* versions of these functions which release the descriptors once the device is released. -See Documentation/acpi/gpio-properties.txt for more information about the +See Documentation/firmware-guide/acpi/gpio-properties.rst for more information about the _DSD binding related to GPIOs. MFD devices diff --git a/Documentation/firmware-guide/acpi/extcon-intel-int3496.rst b/Documentation/firmware-guide/acpi/extcon-intel-int3496.rst new file mode 100644 index 000000000000..5137ca834b54 --- /dev/null +++ b/Documentation/firmware-guide/acpi/extcon-intel-int3496.rst @@ -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 + ======= ======= diff --git a/Documentation/firmware-guide/acpi/index.rst b/Documentation/firmware-guide/acpi/index.rst index ae609eec4679..90c90d42d9ad 100644 --- a/Documentation/firmware-guide/acpi/index.rst +++ b/Documentation/firmware-guide/acpi/index.rst @@ -24,3 +24,4 @@ ACPI Support acpi-lid lpit video_extension + extcon-intel-int3496 diff --git a/Documentation/firmware-guide/acpi/method-tracing.rst b/Documentation/firmware-guide/acpi/method-tracing.rst index d0b077b73f5f..0aa7e2c5d32a 100644 --- a/Documentation/firmware-guide/acpi/method-tracing.rst +++ b/Documentation/firmware-guide/acpi/method-tracing.rst @@ -68,7 +68,7 @@ c. Filter out the debug layer/level matched logs when the specified Where: 0xXXXXXXXX/0xYYYYYYYY - Refer to Documentation/acpi/debug.txt for possible debug layer/level + Refer to Documentation/firmware-guide/acpi/debug.rst for possible debug layer/level masking values. \PPPP.AAAA.TTTT.HHHH Full path of a control method that can be found in the ACPI namespace. |