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Sometimes it is useful to be able to navigate firmware node hierarchy upwards toward parent nodes. ACPI device nodes are pretty much already supported because ACPICA provides acpi_get_parent(). ACPI data nodes, however, are all below the same parent ACPI device. Their hierarchy is created by "linking" each other using references in the value field. Add parent pointer to the parent data node while we create them so it is easy to navigate the hierarchy backwards. We use this parent pointer in a new function acpi_node_get_parent() that is able to extract parent of both ACPI firmware node types. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.