linux-kernel - Re: [PATCH 6/6] tty: serial: Add 8250-core based omap driver

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Date:	Wed, 16 Jul 2014 18:30:30 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	Tony Lindgren <tony@...mide.com>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
CC:	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Felipe Balbi <balbi@...com>, <linux-kernel@...r.kernel.org>,
	<linux-serial@...r.kernel.org>
Subject: Re: [PATCH 6/6] tty: serial: Add 8250-core based omap driver

On Wednesday 16 July 2014 06:02 PM, Tony Lindgren wrote:
> * Sebastian Andrzej Siewior <bigeasy@...utronix.de> [140716 05:14]:
>> On 07/11/2014 08:41 AM, Tony Lindgren wrote:
>>>
>>> If the RX pin does not wake it up, you need to configure the
>>> pinctrl-single entry for it, and configure that pin as a wake-up
>>> interrupt. See the interrupts-extended entry in omap3-beagle-xm.dts.
>>
>> This does not help. Checking the manual, there is not something like
>> PIN_OFF_WAKEUPENABLE for am33xx. There is just INPUT/OUTPUT, pull
>> up/down + enabled/disabled and the mux_mode. For the interrupt, the HW
>> referenced as omap3_pmx_core touches some bits in the pinmux register
>> which do not exists on am33xx.
> 
> Right, on am33xx there's no IO chain wake-up path. AFAIK the only way
> to provide wake events on am33xx would be to mux the RX pin temporarily
> to a GPIO input. And sounds like that may work only if the GPIO is
> in the first GPIO bank that's always on. I don't know if the other
> GPIO banks on am33xx can provide wake up events.

No, they cannot.

Thanks,
Sekhar
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