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09d8b2bdbc
Enable/Clear module level UART wakeup in UART_OMAP_WER register based on return value of device_may_wakeup() in .suspend(). This allows userspace to use sysfs to control the ability of UART to wakeup the system from deep sleep state. Register is restored back in .startup() call that happens as part of resume sequence. With this patch, userspace can control UART wakeup capability via sysfs: To enable wakeup capability: echo enabled > /sys/class/tty/ttyXX/device/power/wakeup For disabling wakeup capability: echo disabled > /sys/class/tty/ttyXX/device/power/wakeup Note that the UART wakeup events configured in the 8250 hardware only work for idle modes that do not cut off power for the UART. For deeper idle states, dedicated padconf wakeirqs must be used. Or in some cases the UART RX pin can be remuxed to GPIO input if the GPIO block stays powered. Signed-off-by: Vignesh R <vigneshr@ti.com> Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| firmware | ||
| 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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.