bcma: add GPIO driver

Register a GPIO driver to access the GPIOs provided by the chip.
The GPIOs of the SoC should always start at 0 and the other GPIOs could
start at a random position. There is just one SoC in a system and when
they start at 0 the number is predictable.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Patchwork: http://patchwork.linux-mips.org/patch/4587
Acked-by: Florian Fainelli <florian@openwrt.org>

include/linux/bcma/bcma_driver_chipcommon.h

@@ -1,6 +1,8 @@
 #ifndef LINUX_BCMA_DRIVER_CC_H_
 #define LINUX_BCMA_DRIVER_CC_H_
 
+#include <linux/gpio.h>
+
 /** ChipCommon core registers. **/
 #define BCMA_CC_ID			0x0000
 #define  BCMA_CC_ID_ID			0x0000FFFF
@@ -570,6 +572,9 @@ struct bcma_drv_cc {
 
 	/* Lock for GPIO register access. */
 	spinlock_t gpio_lock;
+#ifdef CONFIG_BCMA_DRIVER_GPIO
+	struct gpio_chip gpio;
+#endif
 };
 
 /* Register access */