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At the moment, USB gadget mode on MSM8916 works only with an extcon device that reports the correct USB mode. This might be because the USB PHY needs to be configured appropriately. Unfortunately there is currently no simple approach to get such an extcon device during early bring-up. The extcon device for USB VBUS (i.e. gadget/peripheral mode) is typically provided by the charging driver which is almost always very complex to port. On pretty much all devices with PM8916, the USB VBUS is also connected to the PM8916 "USB_IN" pad, no matter if they use the linear charger integrated into PM8916 or not. The state of this pad can be checked with the "USBIN_VALID" interrupt of PM8916. The "qcom,pm8941-misc" binding exists to expose an "usb_vbus" and/or "usb_id" interrupt from the PMIC as an extcon device. Add a &pm8916_usbin node to pm8916.dtsi which can be used as simple extcon device for devices that are currently lacking a proper charger driver. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20210928112945.25310-2-stephan@gerhold.net
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.