linux-kernel - Re: [RFCv2 PATCH 1/8] irqdomain: Introduce irq_domain_ops.init_alloc

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Message-ID: <55B08EC2.4000204@amd.com>
Date:	Thu, 23 Jul 2015 13:50:42 +0700
From:	Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	<marc.zyngier@....com>, <lorenzo.pieralisi@....com>,
	<hanjun.guo@...aro.org>, <tomasz.nowicki@...aro.org>,
	<rjw@...ysocki.net>, <al.stone@...aro.org>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<msalter@...hat.com>, <grant.likely@...aro.org>,
	<leo.duran@....com>, <sherry.hurwitz@....com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>
Subject: Re: [RFCv2 PATCH 1/8] irqdomain: Introduce
 irq_domain_ops.init_alloc_info



On 7/21/15 04:28, Thomas Gleixner wrote:
> On Mon, 13 Jul 2015, Suravee Suthikulpanit wrote:
>
>> Currently, when calling irq_domain_alloc_irqs() on ARM64, it uses
>> struct of_phandle_args to pass irq information. However, this is not
>> appropriate for ACPI since of_phandle_args is specific to DT.
>>
>> Therefore, this patch introduces a new function pointer,
>> irq_domain_ops.init_alloc_info, which can be used by irqchips to provide
>> a way to initialize irqchip-specific data-structure for allocating IRQ.
>>
>> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
>> ---
>> NOTE:
>> Similarly, x86 is currently using struct irq_alloc_info
>> (see arch/x86/include/asm/hw_irq.h) and each irq_domain has different
>> way of initializing this structure.
>
> And why don't you use the same mechanism on ARM and have a private
> irq_alloc_info implementation which can carry either DT or ACPI
> information?

Let me look further into this. I would like to take a similar approach here.

Suravee

> Thanks,
>
> 	tglx
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