linux-kernel - Re: at91sam9260 wakeup on serial port

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Message-ID: <479FC6D2.7040707@gandalf.sssup.it>
Date:	Wed, 30 Jan 2008 01:37:38 +0100
From:	michael <trimarchi@...dalf.sssup.it>
To:	Haavard Skinnemoen <hskinnemoen@...el.com>
CC:	David Brownell <david-b@...bell.net>, linux-kernel@...r.kernel.org,
	Andrew Victor <linux@...im.org.za>
Subject: Re: at91sam9260 wakeup on serial port

Hi,
> On Mon, 28 Jan 2008 10:21:57 -0800
> David Brownell <david-b@...bell.net> wrote:
>
> There's a separate WAKE_N pin that is completely asynchronous, so with
> some external logic, we can probably wake up the CPU all the way from
> Static mode if a given input state is present. But that's definitely
> "board specific" territory, and starting the oscillators take a _long_
> time on the AP7000 (especially the 32 kHz, but then again, it barely
> consumes any power, so we might as well keep it running and keep the
> RTC going as well.)
>   
Maybe is possible to create a generic device based on the gpio to provide
wakeup solutions on suspend-ram state to the peripherals
that registered to him

serial->register_gpio_wakeup             x_driver->register_gpio_wakeup 
          

serial->suspend                          x_driver
    |                                        |
    |                                        |
    \------> gpio_power->suspend <-----------/

serial->resume                           x_driver
    |                                        |
    |                                        |
    \------> gpio_power->resume <------------/

               |----request_irq n1
gpio_power-----|----request_irq n2
               |----request_irq n3

Create an attribute on the sysfs to add a wakeup reason to the user space.

Regards Michael

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