linux-kernel - Re: [PATCH] atmel_serial: update the powersave handler to match serial core

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Date:	Fri, 19 Sep 2008 16:01:40 +0000 (GMT)
From:	Michael Trimarchi <trimarchimichael@...oo.it>
To:	Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Cc:	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Victor <linux@...im.org.za>,
	Anti Sullin <anti.sullin@...ecdesign.ee>
Subject: Re: [PATCH] atmel_serial: update the powersave handler to match serial core

Hi,


(I'll change my mailer soon ...), sorry if I break the thread.


----- Messaggio originale -----
> Da: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
> A: Michael Trimarchi <trimarchimichael@...oo.it>
> Cc: linux-serial@...r.kernel.org; linux-kernel@...r.kernel.org; Andrew Victor <linux@...im.org.za>; Anti Sullin <anti.sullin@...ecdesign.ee>
> Inviato: Venerdì 19 settembre 2008, 17:46:15
> Oggetto: Re: [PATCH] atmel_serial: update the powersave handler to match serial core
> 
> Michael Trimarchi wrote:
> > > +    /* we can not wake up if we're running on slow clock */
> > > +    atmel_port->may_wakeup = device_may_wakeup(&pdev->dev);
> > > +    if (atmel_serial_clk_will_stop())
> > > +        device_set_wakeup_enable(&pdev->dev, 0);
> > > +  
> > This is not true, the wakeup in the slow clock is possible, configure the
> > input pin of the serial device as a gpio, and wake up on gpio. Then you
> > must reconfigure as a serial pin, and you can wake up on slow clock.
> 
> Yes, but the current driver doesn't actually support that, does it?
> 

Yes I know, but we can think about it and support when is possible
to wake-up the serial device. Each serial device can change the status
of the gpio-pin before suspendig and register and handler on it (I think one
interrupt handler for all the serial that can do that), then reset it after resume.
I think not all the serial device can do that in the atmel architectures but I suppose
that can be very usefull for example in gprs application.

> This patch doesn't really change that assumption anyway -- it just
> implements it in a way more consistent with the current serial core.
> 

> Haavard

Regards Michael

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