linux-kernel - Re: [patch 08/16] genirq: Introduce callback irq_chip.irq_write_msi

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Date:	Tue, 18 Nov 2014 15:19:49 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Yun Wu (Abel)" <wuyun.wu@...wei.com>
cc:	Jiang Liu <jiang.liu@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Grant Likely <grant.likely@...aro.org>,
	Marc Zyngier <marc.zyngier@....com>,
	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	Yijing Wang <wangyijing@...wei.com>
Subject: Re: [patch 08/16] genirq: Introduce callback
 irq_chip.irq_write_msi_msg

On Tue, 18 Nov 2014, Yun Wu (Abel) wrote:
> On 2014/11/18 21:43, Jiang Liu wrote:
> > 	We provide an irq_chip for each type of interrupt controller
> > instead of devices. For the example mentioned above, if device A
> > and Group B has different interrupt controllers, we just need to
> > implement irq_chip_A and irq_chip_B and set irq_chip.irq_write_msi_msg()
> > to suitable callbacks.
> > 	The framework already achieves what you you want:)
> 
> What if device A and group B have the same interrupt controller?

Well, if write_msg() is different they are hardly the same.

Thanks,

	tglx
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