linux-kernel - Re: [PATCH V4 1/6] regmap: irq: add apis to unmap the mapped irq

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Date:	Mon, 8 Feb 2016 22:08:28 +0530
From:	Laxman Dewangan <ldewangan@...dia.com>
To:	Mark Brown <broonie@...nel.org>
CC:	<lee.jones@...aro.org>, <alexandre.belloni@...e-electrons.com>,
	<k.kozlowski@...sung.com>, <javier@....samsung.com>,
	<gregkh@...uxfoundation.org>, <a.zummo@...ertech.it>,
	<cw00.choi@...sung.com>, <linux-kernel@...r.kernel.org>,
	<rtc-linux@...glegroups.com>
Subject: Re: [PATCH V4 1/6] regmap: irq: add apis to unmap the mapped irq


On Monday 08 February 2016 08:25 PM, Mark Brown wrote:
> * PGP Signed by an unknown key
>
> On Sat, Feb 06, 2016 at 08:07:22PM +0530, Laxman Dewangan wrote:
>
>> Before removing irq domains, it is require to unmap all
>> mapped interrupt from that domain. Currently there is API
>> to map the interrupt on chip as regmap_irq_get_virq() for
>> creating mapping. Add equivalent API to dispose the mapped
>> irq in irq domains.
> This makes no sense to me.  Why would you ever want to unmap the
> interrupts separately to destroying the domain

This is the requirement from irq_domain_remove(). This is what we have 
in irq_domain_remove():
kernel/irq/irqdomain.c

/*
  * This routine is used to remove an irq domain. The caller must ensure
  * that all mappings within the domain have been disposed of prior to
  * use, depending on the revmap type.
  */
void irq_domain_remove(struct irq_domain *domain)


I am adding the API equivalent to regmap_irq_get_virq() to unmap virtual 
irq here.



> and why would you ever
> want to destroy the domain without unmapping the interrupts?
>
That's exactlly we are trying to do, unmap interrupt in client level 
before destroying domain.