linux-kernel - Re: [PATCH 2/3] mfd: twl6040: Add twl6040-gpio child

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Message-ID: <5023A8AE.5050300@ti.com>
Date:	Thu, 09 Aug 2012 15:10:22 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Sergio Aguirre <saaguirre@...com>,
	Linus Walleij <linus.walleij@...ricsson.com>
Subject: Re: [PATCH 2/3] mfd: twl6040: Add twl6040-gpio child

On 08/09/2012 02:55 PM, Mark Brown wrote:
> On Mon, Jul 30, 2012 at 05:13:17PM +0300, Peter Ujfalusi wrote:
> 
>> If the board needs the gpo driver, but in the driver(s) I need to check for
>> the existence of the "ti,twl6040-gpo" node and check if the status is "okay".
>> I think it is easier to just get the value of "ti,use-gpo", if it exist and it
>> is 1 I enable the GPIO driver otherwise I don't.
> 
> Will having the GPIO driver actually cause any problems if it's not in
> use?  It's not like things like RTC which are directly visible to
> userspace and so can create problems if they're non-functional, unless
> it does something like grab resources that might be needed by another
> subfunction driver there's not really a substantial cost in just
> instantiating it (people who are really space pressured probably won't
> build the driver in in the first place).

Fair enough, I'll make the change for the v2.

-- 
Péter
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