linux-kernel - Re: Armadaxp GPIO interrupts

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Message-ID: <CAG1O52XUyPkgTTRKftujZBNK1=n6GBdWgBg_kq6SsC5XMaeU3w@mail.gmail.com>
Date:	Thu, 6 Aug 2015 22:28:12 +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

Ok,I think I need to understand more about this gpio driver.

As you said its registering chained handler,but why are they(IRQs) not
visible in cat /proc/interrupts.
What could be the reason.?

Do I need to further initialize marvell GPIO registers to trigger
these events. The driver is unmasking all interrupts in probe function
                writel_relaxed(0, mvchip->membase + GPIO_EDGE_CAUSE_OFF);
                writel_relaxed(0, mvchip->membase + GPIO_EDGE_MASK_OFF);
                writel_relaxed(0, mvchip->membase + GPIO_LEVEL_MASK_OFF);


Do I need to change the polarity in polarity register to suit the
board requirements in probe function.

I will try this in the morning.


Regards
Raghu

On Thu, Aug 6, 2015 at 6:59 PM, Andrew Lunn <andrew@...n.ch> wrote:
>> 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.
>
> This is totally wrong. The gpio driver needs these interrupts, and
> will register a chained interrupt handle for these. Don't mess around
> with them. Here is the code in the driver:
>
>         /* Setup the interrupt handlers. Each chip can have up to 4
>          * interrupt handlers, with each handler dealing with 8 GPIO
>          * pins. */
>         for (i = 0; i < 4; i++) {
>                 int irq = platform_get_irq(pdev, i);
>
>                 if (irq < 0)
>                         continue;
>                 irq_set_handler_data(irq, mvchip);
>                 irq_set_chained_handler(irq, mvebu_gpio_irq_handler);
>         }
>
>         Andrew
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