linux-kernel - Re: [RFC] gpio/stmpe: add bitmask to block requests to unavailable GPIOs

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Date:	Thu, 19 Aug 2010 18:36:05 +0530
From:	Rabin Vincent <rabin.vincent@...ricsson.com>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus WALLEIJ <linus.walleij@...ricsson.com>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [RFC] gpio/stmpe: add bitmask to block requests to unavailable
 GPIOs

On Wed, Aug 18, 2010 at 12:31:37 +0200, Wolfram Sang wrote:
> On Wed, Aug 18, 2010 at 03:39:50PM +0530, Rabin VINCENT wrote:
> > On Mon, Aug 16, 2010 at 17:14:44 +0200, Wolfram Sang wrote:
> > > GPIOs on these controller are multi-functional. If you decided to use
> > > some of them e.g. as input channels for the ADC, you surely don't want
> > > those pins to be reassigned as simple GPIOs (which may be triggered even
> > > from userspace via 'export'). Same for the touchscreen controller pins.
> > > Since knowledge about the hardware is needed to decide which GPIOs to
> > > reserve, let this bitmask be inside platform_data and provide some
> > > defines to assist potential users.
> > 
> > Could this be done without the platform data, say something like the
> > below?  (Though this does assume that nobody tries to request GPIOs
> > before the STMPE subdrivers reserve their pins.)
> > 
> 
> While I'd also like to skip the additional platform_data entry, your
> last comment is in deed a drawback.

Yes, especially if the subdrivers are dynamically loaded.  Your patch is
fine with me: 

Acked-by: Rabin Vincent <rabin.vincent@...ricsson.com>

The only minor comment is that the STMPE_GPIO_NOREQ_811_TOUCH name could
perhaps be clearer.  STMPE811_GPIO_NOREQ_TOUCHSCREEN, maybe?

Rabin
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