linux-kernel - Re: [PATCH 1/2] gpio: tegra: create irq mapping in gpio_to

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Message-ID: <509A9579.5090002@wwwdotorg.org>
Date:	Wed, 07 Nov 2012 10:08:09 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	linus.walleij@...aro.org, grant.likely@...retlab.ca,
	swarren@...dia.com, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org
Subject: Re: [PATCH 1/2] gpio: tegra: create irq mapping in gpio_to_irq

On 11/07/2012 08:01 AM, Laxman Dewangan wrote:
> The gpio interrupts get mapped linearly and hence the mapping
> of irq need to be created by irq_create_mapping().
> 
> The function gpio_to_irq() returns the irq by irq_find_mapping()
> and so returns 0 as there is no mapping created. Fix the function
> to create mapping when gpio_to_irq() get called.

I'm not convinced this should be needed. tegra_gpio_probe() contains:

>         for (gpio = 0; gpio < tegra_gpio_chip.ngpio; gpio++) {
>                 int irq = irq_create_mapping(irq_domain, gpio);

which should create the mapping for every IRQ.

(although I do think the gpiochip_add() should be moved to the very end
of probe(), I doubt that impacts this issue much)
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