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The Dragonboard-410c is able to act either as USB Host or Device. The role can be determined at runtime via the USB_HS_ID pin which is derived from the micro-usb port VBUS pin. In Host role, SoC USB D+/D- are routed to the onboard USB 2.0 HUB. In Device role, SoC USB D+/D- are routed to the USB 2.0 micro B port. Routing is selected via USB_SW_SEL_PM gpio. In device role USB HUB can be held in reset. chipidea driver expects two extcon device pointers, one for the EXTCON_USB event and one for the EXTCON_USB_HOST event. Since the extcon-usb-gpio device is capable of generating both these events, point two times to this extcon device. Signed-off-by: Loic Poulain <loic.poulain@linaro.org> Link: https://lore.kernel.org/r/1576083014-5842-1-git-send-email-loic.poulain@linaro.org Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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.