twl4030 uses gpiolib

From: David Brownell <[email protected]>

Make the twl4030 core create a platform device to which its GPIO code will bind, with platform_data used to configure board-specific behaviors and configuration.

Update the twl4030 GPIO code:

- Morph its gpio function code into a platform driver.

- Move away from IRQ (and GPIO) numbers hard-wired in headers.

- Hook up the twl4030 GPIO code to gpiolib.

- Start phasing out the older TWL-specific calls ... currently those are used only by arch/arm/mach-omap2/hsmmc.c setup code.

- Use a mutex for locking, not a binary semaphore.

NOTE: more patches pending: (a) this doesn't use pdata->pullups to initialize (currently hsmmc code always sets GPIO-0 pullup even if the board has an external pullup); (b) there's a new gpio request/free hook forthcoming in 2.6.28, which this should use;
(c) likewise there's a new gpio_to_irq() hook; (d) the irq_chip set_type() mechanism needs to be supported; (e) needs to move over to drivers/gpio; (f) upcoming threaded IRQ infrastructure should be used, when that merges.

---
 drivers/i2c/chips/Kconfig        |    2 
 drivers/i2c/chips/twl4030-core.c |   44 +++++
 drivers/i2c/chips/twl4030-gpio.c |  273 ++++++++++++++++++++++++++-----------
 3 files changed, 238 insertions(+), 81 deletions(-)

@@ -159,7 +159,7 @@ config TWL4030_CORE
 
 config TWL4030_GPIO
 	bool "TWL4030 GPIO Driver"
-	depends on TWL4030_CORE
+	depends on TWL4030_CORE && GPIOLIB
 
 config TWL4030_MADC
 	tristate "TWL4030 MADC Driver"