powerpc/86xx: Extend GE Fanuc GPIO driver for the SBC310

This patch adds basic support for the 6 GPIO lines found on GE Fanucs SBC310 to the GE Fanuc GPIO driver.
Signed-off-by: Martyn Welch <martyn.welch@gefanuc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/configs/86xx/gef_sbc310_defconfig

 #
 # Automatically generated make config: don't edit
 # Linux kernel version: 2.6.29-rc3
-# Wed Jan 28 23:04:04 2009
+# Wed Jan 28 23:05:34 2009
 #
 # CONFIG_PPC64 is not set
 
@@ -905,7 +905,7 @@ CONFIG_DS1682=y
 CONFIG_ARCH_WANT_OPTIONAL_GPIOLIB=y
 CONFIG_ARCH_REQUIRE_GPIOLIB=y
 CONFIG_GPIOLIB=y
-# CONFIG_GPIO_SYSFS is not set
+CONFIG_GPIO_SYSFS=y
 
 #
 # Memory mapped GPIO expanders:

arch/powerpc/platforms/86xx/gef_gpio.c

@@ -37,8 +37,6 @@
 #define GEF_GPIO_OVERRUN	0x1C
 #define GEF_GPIO_MODE		0x20
 
-#define NUM_GPIO 19
-
 static void _gef_gpio_set(void __iomem *reg, unsigned int offset, int value)
 {
 	unsigned int data;
@@ -103,11 +101,39 @@ static void gef_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 static int __init gef_gpio_init(void)
 {
 	struct device_node *np;
-
-	for_each_compatible_node(np, NULL, "gef,sbc610-gpio") {
 	int retval;
 	struct of_mm_gpio_chip *gef_gpio_chip;
 
+	for_each_compatible_node(np, NULL, "gef,sbc610-gpio") {
+
+		pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
+
+		/* Allocate chip structure */
+		gef_gpio_chip = kzalloc(sizeof(*gef_gpio_chip), GFP_KERNEL);
+		if (!gef_gpio_chip) {
+			pr_err("%s: Unable to allocate structure\n",
+				np->full_name);
+			continue;
+		}
+
+		/* Setup pointers to chip functions */
+		gef_gpio_chip->of_gc.gpio_cells = 2;
+		gef_gpio_chip->of_gc.gc.ngpio = 19;
+		gef_gpio_chip->of_gc.gc.direction_input = gef_gpio_dir_in;
+		gef_gpio_chip->of_gc.gc.direction_output = gef_gpio_dir_out;
+		gef_gpio_chip->of_gc.gc.get = gef_gpio_get;
+		gef_gpio_chip->of_gc.gc.set = gef_gpio_set;
+
+		/* This function adds a memory mapped GPIO chip */
+		retval = of_mm_gpiochip_add(np, gef_gpio_chip);
+		if (retval) {
+			kfree(gef_gpio_chip);
+			pr_err("%s: Unable to add GPIO\n", np->full_name);
+		}
+	}
+
+	for_each_compatible_node(np, NULL, "gef,sbc310-gpio") {
+
 		pr_debug("%s: Initialising GEF GPIO\n", np->full_name);
 
 		/* Allocate chip structure */
@@ -120,7 +146,7 @@ static int __init gef_gpio_init(void)
 
 		/* Setup pointers to chip functions */
 		gef_gpio_chip->of_gc.gpio_cells = 2;
-		gef_gpio_chip->of_gc.gc.ngpio = NUM_GPIO;
+		gef_gpio_chip->of_gc.gc.ngpio = 6;
 		gef_gpio_chip->of_gc.gc.direction_input = gef_gpio_dir_in;
 		gef_gpio_chip->of_gc.gc.direction_output = gef_gpio_dir_out;
 		gef_gpio_chip->of_gc.gc.get = gef_gpio_get;