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This property is used to prevent RC from calling devices to enter D3cold if they need to keep working when system is suspended. The classic user is wireless device and computing cards which need to work standalone when system is suspened. Currently wireless devices deal with it by controlling power and #PERST by themselves because they have rfkill driver which could did it in front of the wireless driver. But computing cards couldn't. In ACPI point of view, we could allow users to configure the D3Cold state for each PCI device through the sysfs attribute 'sys/bus/pci/devices.../d3cold_allowed'. Then the PCIe driver and firmware could work together to meet the requirement. But in DT way, we have to invent a new property to cover both of these. Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com> Change-Id: Ia755f48d11f84f292a4aede38d2653b73f8d11b8
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.