linux-kernel - Re: [PATCH 2/6] ACPI / bus: Make acpi_get_first_physical

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Date:   Tue, 13 Sep 2016 00:03:17 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Lukas Wunner <lukas@...ner.de>
Cc:     linux-efi@...r.kernel.org, Matt Fleming <matt@...eblueprint.co.uk>,
        linux-kernel@...r.kernel.org,
        Andreas Noever <andreas.noever@...il.com>,
        Pierre Moreau <pierre.morrow@...e.fr>,
        Aleksey Makarov <aleksey.makarov@...aro.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-acpi@...r.kernel.org
Subject: Re: [PATCH 2/6] ACPI / bus: Make acpi_get_first_physical_node() public

On Wednesday, August 17, 2016 02:38:15 AM Rafael J. Wysocki wrote:
> 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 <aleksey.makarov@...aro.org>
> > Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> > Signed-off-by: Lukas Wunner <lukas@...ner.de>
> 
> ACK

I've applied this one, thanks!

Rafael