linux-kernel - Re: [PATCH 0/3] ARM: OMAP2+: omap_device: add dynamic pinctrl handling

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Date:	Wed, 17 Jul 2013 15:30:36 +0300
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	Roger Quadros <rogerq@...com>
CC:	Tony Lindgren <tony@...mide.com>,
	Kevin Hilman <khilman@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<devicetree-discuss@...ts.ozlabs.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Stephen Warren <swarren@...dotorg.org>
Subject: Re: [PATCH 0/3] ARM: OMAP2+: omap_device: add dynamic pinctrl handling

On 07/17/2013 02:57 PM, Roger Quadros wrote:
> Hi Grygorii,
>
> On 07/17/2013 02:41 PM, Grygorii Strashko wrote:
>> Hi Tony, Kevin
>>
>> This patch series introduces dynamic pinctrl handling in OMAP device framework
>> in the same way as it was before switching to DT.
>> This allow OMAP devices driver's developers to simply add dynamic pinctrl
>> handling for "default", "active", "idle", "sleep" PIN states in their drivers
>> by modifying DT definitions only - no modifications in drivers code are not needed.
>>
>
> Overall I like the idea but can we make a provision for device drivers to override
> this default pin state handling?
>
> The OMAP EHCI driver is one such special case where the wakeup mechanism is tied to pinctrl states
> as it uses IO daisy chaining to implement wakeup.
> So depending on whether wakeup needs to be enabled or not I must be able to chose whether
> I put the pin in just "sleep" state or "sleep with wakeup" state.

I think, in this case you can't use default behavior and need to define
custom pins states like "sleep_wakeup"/"sleep_no_wakeup" and do not
define pins state with name "sleep', so Device core and OMAP device
framework will not touch your pins.

>
> cheers,
> -roger
>

Regards,
-grygorii
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