linux-kernel - Re: [PATCH 2/5 v11] arm: omap: usb: ehci and ohci hwmod structures for omap3

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Date:	Tue, 27 Sep 2011 17:38:51 +0300
From:	Tero Kristo <t-kristo@...com>
To:	"Balbi, Felipe" <balbi@...com>
CC:	"Munegowda, Keshava" <keshava_mgowda@...com>,
	Paul Walmsley <paul@...an.com>,
	"Cousson, Benoit" <b-cousson@...com>,
	"Basak, Partha" <p-basak2@...com>, <parthab@...ia.ti.com>,
	<linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, "Gadiyar, Anand" <gadiyar@...com>,
	<sameo@...ux.intel.com>, <tony@...mide.com>,
	"Hilman, Kevin" <khilman@...com>, <johnstul@...ibm.com>,
	"Sripathy, Vishwanath" <vishwanath.bs@...com>
Subject: Re: [PATCH 2/5 v11] arm: omap: usb: ehci and ohci hwmod structures for omap3

On Tue, 2011-09-27 at 15:24 +0200, Balbi, Felipe wrote:
> Hi,
> 
> On Tue, Sep 27, 2011 at 06:48:35PM +0530, Munegowda, Keshava wrote:
> > > So, you would need a mechanism to do something like this:
> > >
> > > pad a or b wakeup detected -> irq0
> > > pad c or d wakeup detected -> irq1?
> > 
> > yes, if get something like this , its perfect.
> 
> can't you have different IRQs for each pad ? I mean, allocate one
> irq_desc for each pad and let drivers request a pad/pin as an IRQ
> source. Then, when you detect a pad wakeup, you can:

Direct pad to irq mapping was turned down on some previous version of
the prcm chain handler set, but yes, it is a potential approach. However
the irq_desc allocation mechanism should be dynamic... there are some
200 programmable pads anyway.

>
> unsigned	pad_irq = pad_number - pad->irq_base;
> 
> handle_nested_thread(pad_irq);
> 
> this will make use of threaded IRQ handlers even. Could it be something
> like that ?
> 



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