linux-kernel - Re: [PATCH v4 0/9] Making the generic ACPI GSI layer irqdomain aware

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Message-ID: <CAL_Jsq+b10aEREipSsrg69=S4gpv-xZWRYS+TVTvhbqdHGATsA@mail.gmail.com>
Date:	Tue, 29 Sep 2015 12:11:11 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Mark Rutland <mark.rutland@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Frank Rowand <frowand.list@...il.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
	Graeme Gregory <graeme@...a.org.uk>,
	Jake Oshins <jakeo@...rosoft.com>
Subject: Re: [PATCH v4 0/9] Making the generic ACPI GSI layer irqdomain aware

On Mon, Sep 28, 2015 at 11:42 AM, Marc Zyngier <marc.zyngier@....com> wrote:
> The irqdomain code is not entierely ACPI friendly, as it has some
> built-in knowledge of the device-tree. Nothing too harmful, but enough
> to scare the ARM ACPI developpers which end up with their own version
> of the square wheel.
>
> This small patch series adapts the irqdomain code to remove the
> hurdles that prevent the full blown irqdomain subsystem to be used on
> ACPI, creates an interface between the GSI layer and the irqdomain,
> and as an example, convert the ARM GIC ACPI support to use irqdomains
> as originally intended.
>
> Overall, this gives us a way to use irqdomains on both DT and ACPI
> enabled platforms, having very little changes made to the actual
> drivers (other than the probing infrastructure). Because we keep the
> flow of information between the various layers identical between ACPI
> and DT, we immediately benefit from the existing infrastructure. The
> "convert the GSI information to be DT friendly" is admitedly not very
> pretty, but I see it as a stepping stone towards unifying the two
> structures.

Did I miss v1-v3 or did the DT change just show up? I probably tuned
out with ACPI in the subject.

Needing fake DT nodes for ACPI is just wrong. There's got to be
another, better way.

Rob
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