linux-kernel - Re: [PATCH 0/5] Making the generic ACPI GSI layer irqdomain aware

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Date:	Wed, 22 Jul 2015 14:45:52 +0800
From:	Hanjun Guo <hanjun.guo@...aro.org>
To:	Marc Zyngier <marc.zyngier@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jiang Liu <jiang.liu@...ux.intel.com>,
	Jason Cooper <jason@...edaemon.net>
CC:	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Tomasz Nowicki <tomasz.nowicki@...aro.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
Subject: Re: [PATCH 0/5] Making the generic ACPI GSI layer irqdomain aware

Hi Marc,

On 07/21/2015 06:07 PM, Marc Zyngier wrote:
> The irqdomain code is not entierely really 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 adapt 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.
>
> I'd really like to hear what people think of that approach, as it
> looks to me a lot simpler than the other approaches currently put on
> the list. 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.
>
> This has been test-booted on Juno, and is based on my irq/ncpi-msi-2
> branch.

Thank you very much for putting them together, really appreciated. I
will comment on each patch and test them.

Thanks
Hanjun
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