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SubjectRe: [PATCH 2/6] ACPI / bus: Make acpi_get_first_physical_node() public
On Thursday, July 28, 2016 02:25:41 AM Lukas Wunner wrote:
> Following the fwnode of a device is currently a one-way road: We provide
> ACPI_COMPANION() to obtain the fwnode but there's no (public) method to
> do the reverse. Granted, there may be multiple physical_nodes, but often
> the first one in the list is sufficient.
> A handy function to obtain it was introduced with commit 3b95bd160547
> ("ACPI: introduce a function to find the first physical device"), but
> currently it's only available internally.
> We're about to add an EFI Device Path parser which needs this function.
> Consider the following device path: ACPI(PNP0A03,0)/PCI(28,2)/PCI(0,0)
> The PCI root is encoded as an ACPI device in the path, so the parser
> has to find the corresponding ACPI device, then find its physical node,
> find the PCI bridge in slot 1c (decimal 28), function 2 below it and
> finally find the PCI device in slot 0, function 0.
> To this end, make acpi_get_first_physical_node() public.
> Cc: Aleksey Makarov <>
> Cc: Rafael J. Wysocki <>
> Signed-off-by: Lukas Wunner <>



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