linux-kernel - Re: Armadaxp GPIO interrupts

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Date:	Thu, 6 Aug 2015 11:24:36 +0530
From:	raghu MG <raghumag@...il.com>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Subject: Re: Armadaxp GPIO interrupts

Hi Andrew,

My platform/board is ATCA carrier card which is getting interface to I/O card.
The I/O card is hot-pluggable  or Jack-in or Jack out.
Also I/O card consists of hot-plugable SFP interface.
These events are triggered using GPIO's

So the events the carrier card recieves are
1) If I/O card is either Jacked-in or Jacked-out ,respective GPIO
pin-x triggers an event
2) If SFP is pushed into I/O card the respective GPIO pin-y triggers an event.

Another observation about  "irq: Cannot allocate irq_descs @ IRQ47/79/111".
This is warning & irq_descs are already allocated , the overall
initialization/probe function doesn't get effected.
mvebu_gpio_irq_handler is only called if I register a another handler
at irq=82/83/84/85/87/88/89/90/92. I am registering this handler using
minimal kernel module.
My understanding of Linux IRQ/interrupt mechanism is limited to
request_irq, but registering domain & then IRQ is bit not clear.

Regards
Raghu

On Wed, Aug 5, 2015 at 9:51 PM, Andrew Lunn <andrew@...n.ch> wrote:
> On Wed, Aug 05, 2015 at 08:31:27PM +0530, raghu MG wrote:
>> Hi Andrew,
>>
>> The issue I found was  irq_alloc_descs is called twice
>> 1st time inside   mvebu_gpio_probe & 2nd time inside irq_domain_add_simple.
>
> So i'm somewhat confused. I just tested on my Kirkwood and 370
> platforms, and an Armada XP WRT1900AC using 4.2.0-rc5, all which use
> the same gpio driver.
>
> They boot fine, the gpio driver is loaded, and the interrupt for the
> gpio connected to a button are listed in /proc/interrupts. The
> gpio-key driver is also able to use the gpio and the input-events
> program does show events when i press the button.
>
> So what is different with your platform?
>
>    Andrew
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