linux-kernel - Re: [PATCH v4] gpio: sx150x: Add Semtech I2C sx150x gpio expander driver.

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Date:	Thu, 22 Jul 2010 10:22:42 -0700
From:	Greg Bean <gbean@...eaurora.org>
To:	Randy Dunlap <randy.dunlap@...cle.com>
CC:	akpm@...ux-foundation.org, david-b@...bell.net, khali@...ux-fr.org,
	linux-i2c@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] gpio: sx150x: Add Semtech I2C sx150x gpio expander
 driver.

 >> +	bool "Semtech SX150x I2C GPIO expander"
 >> +	depends on I2C=y
 >> +	default n
 >> +	help
 >> +	  Say yes here to provide support for Semtech SX150-series I2C
 >> +	  GPIO expanders. Compatible models include:
 >
 > Just curious, not complaining, but why does this driver (and some others)
 > need to be built-in instead of having the option of being built as a
 > loadable module?

It's that way because it requires unexported symbols from genirq and 
I2C.  If this driver is allowed to be a module, it can't find the 
unexported genirq symbols, and if I2C is allowed to be a module, then a 
bunch of i2c_smbus stuff can't be resolved...

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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