[PATCH 1/2] drivers gpio: Check for negativ gpio values

[PATCH 1/2] drivers gpio: Check for negativ gpio values

[Teresa Gámez]

Signed-off-by: Teresa Gámez <t.gamez@phytec.de>
---
 drivers/gpio/gpio.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/gpio/gpio.c b/drivers/gpio/gpio.c
index 6ad8d27..0966e2a 100644
--- a/drivers/gpio/gpio.c
+++ b/drivers/gpio/gpio.c
@@ -10,7 +10,7 @@ static struct gpio_chip *gpio_desc[ARCH_NR_GPIOS];
 
 static int gpio_is_valid(unsigned gpio)
 {
-	if (gpio < ARCH_NR_GPIOS)
+	if (gpio < ARCH_NR_GPIOS && gpio >= 0)
 		return 1;
 	return 0;
 }
-- 
1.7.0.4


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[PATCH 2/2] ARM OMAP: switch to gpiolib support

[Teresa Gámez]

Signed-off-by: Teresa Gámez <t.gamez@phytec.de>
---
 arch/arm/Kconfig                   |    1 +
 arch/arm/mach-omap/gpio.c          |  171 ++++++++++++++++-------------------
 arch/arm/mach-omap/omap3_generic.c |   19 ++++
 arch/arm/mach-omap/omap4_generic.c |   19 ++++
 4 files changed, 117 insertions(+), 93 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a54ad03..7b7b058 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -58,6 +58,7 @@ config ARCH_NOMADIK
 config ARCH_OMAP
 	bool "TI OMAP"
 	select HAS_DEBUG_LL
+	select GPIOLIB
 
 config ARCH_PXA
 	bool "Intel/Marvell PXA based"
diff --git a/arch/arm/mach-omap/gpio.c b/arch/arm/mach-omap/gpio.c
index 142cf52..d217550 100644
--- a/arch/arm/mach-omap/gpio.c
+++ b/arch/arm/mach-omap/gpio.c
@@ -36,11 +36,10 @@
  * published by the Free Software Foundation.
  */
 #include <common.h>
-#include <mach/gpio.h>
 #include <io.h>
 #include <errno.h>
-
-#ifdef CONFIG_ARCH_OMAP3
+#include <gpio.h>
+#include <init.h>
 
 #define OMAP_GPIO_OE		0x0034
 #define OMAP_GPIO_DATAIN	0x0038
@@ -48,129 +47,115 @@
 #define OMAP_GPIO_CLEARDATAOUT	0x0090
 #define OMAP_GPIO_SETDATAOUT	0x0094
 
-static void __iomem *gpio_bank[] = {
-	(void *)0x48310000,
-	(void *)0x49050000,
-	(void *)0x49052000,
-	(void *)0x49054000,
-	(void *)0x49056000,
-	(void *)0x49058000,
-};
-#endif
-
-#ifdef CONFIG_ARCH_OMAP4
-
-#define OMAP_GPIO_OE		0x0134
-#define OMAP_GPIO_DATAIN	0x0138
-#define OMAP_GPIO_DATAOUT	0x013c
-#define OMAP_GPIO_CLEARDATAOUT	0x0190
-#define OMAP_GPIO_SETDATAOUT	0x0194
-
-static void __iomem *gpio_bank[] = {
-	(void *)0x4a310000,
-	(void *)0x48055000,
-	(void *)0x48057000,
-	(void *)0x48059000,
-	(void *)0x4805b000,
-	(void *)0x4805d000,
+struct omap_gpio_chip {
+	void __iomem *base;
+	struct gpio_chip chip;
 };
-#endif
-
-static inline void __iomem *get_gpio_base(int gpio)
-{
-	return gpio_bank[gpio >> 5];
-}
 
-static inline int get_gpio_index(int gpio)
+static inline int omap_get_gpio_index(int gpio)
 {
 	return gpio & 0x1f;
 }
 
-static inline int gpio_valid(int gpio)
+static void omap_gpio_set_value(struct gpio_chip *chip,
+					unsigned gpio, int value)
 {
-	if (gpio < 0)
-		return -1;
-	if (gpio / 32 < ARRAY_SIZE(gpio_bank))
-		return 0;
-	return -1;
-}
-
-static int check_gpio(int gpio)
-{
-	if (gpio_valid(gpio) < 0) {
-		printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
-		return -1;
-	}
-	return 0;
-}
-
-void gpio_set_value(unsigned gpio, int value)
-{
-	void __iomem *reg;
+	struct omap_gpio_chip *omapgpio =
+			container_of(chip, struct omap_gpio_chip, chip);
+	void __iomem *base = omapgpio->base;
 	u32 l = 0;
 
-	if (check_gpio(gpio) < 0)
-		return;
-
-	reg = get_gpio_base(gpio);
-
 	if (value)
-		reg += OMAP_GPIO_SETDATAOUT;
+		base += OMAP_GPIO_SETDATAOUT;
 	else
-		reg += OMAP_GPIO_CLEARDATAOUT;
-	l = 1 << get_gpio_index(gpio);
+		base += OMAP_GPIO_CLEARDATAOUT;
+
+	l = 1 << omap_get_gpio_index(gpio);
 
-	__raw_writel(l, reg);
+	writel(l, base);
 }
 
-int gpio_direction_input(unsigned gpio)
+static int omap_gpio_direction_input(struct gpio_chip *chip,
+					unsigned gpio)
 {
-	void __iomem *reg;
+	struct omap_gpio_chip *omapgpio =
+			container_of(chip, struct omap_gpio_chip, chip);
+	void __iomem *base = omapgpio->base;
 	u32 val;
 
-	if (check_gpio(gpio) < 0)
-		return -EINVAL;
-
-	reg = get_gpio_base(gpio);
-
-	reg += OMAP_GPIO_OE;
+	base += OMAP_GPIO_OE;
 
-	val = __raw_readl(reg);
-	val |= 1 << get_gpio_index(gpio);
-	__raw_writel(val, reg);
+	val = readl(base);
+	val |= 1 << omap_get_gpio_index(gpio);
+	writel(val, base);
 
 	return 0;
 }
 
-int gpio_direction_output(unsigned gpio, int value)
+static int omap_gpio_direction_output(struct gpio_chip *chip,
+					unsigned gpio, int value)
 {
-	void __iomem *reg;
+	struct omap_gpio_chip *omapgpio =
+			container_of(chip, struct omap_gpio_chip, chip);
+	void __iomem *base = omapgpio->base;
 	u32 val;
 
-	if (check_gpio(gpio) < 0)
-		return -EINVAL;
-	reg = get_gpio_base(gpio);
+	omap_gpio_set_value(chip, gpio, value);
 
-	gpio_set_value(gpio, value);
+	base += OMAP_GPIO_OE;
 
-	reg += OMAP_GPIO_OE;
-
-	val = __raw_readl(reg);
-	val &= ~(1 << get_gpio_index(gpio));
-	__raw_writel(val, reg);
+	val = readl(base);
+	val &= ~(1 << omap_get_gpio_index(gpio));
+	writel(val, base);
 
 	return 0;
 }
 
-int gpio_get_value(unsigned gpio)
+static int omap_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+	struct omap_gpio_chip *omapgpio =
+			container_of(chip, struct omap_gpio_chip, chip);
+	void __iomem *base = omapgpio->base;
+
+	base  += OMAP_GPIO_DATAIN;
+
+	return (readl(base) & (1 << omap_get_gpio_index(gpio))) != 0;
+
+}
+
+static struct gpio_ops omap_gpio_ops = {
+	.direction_input = omap_gpio_direction_input,
+	.direction_output = omap_gpio_direction_output,
+	.get = omap_gpio_get_value,
+	.set = omap_gpio_set_value,
+};
+
+static int omap_gpio_probe(struct device_d *dev)
 {
-	void __iomem *reg;
+	struct omap_gpio_chip *omapgpio;
+
+	omapgpio = xzalloc(sizeof(*omapgpio));
+	omapgpio->base = dev_request_mem_region(dev, 0);
+	omapgpio->chip.ops = &omap_gpio_ops;
+	omapgpio->chip.base = -1;
+	omapgpio->chip.ngpio = 32;
+	omapgpio->chip.dev = dev;
+	gpiochip_add(&omapgpio->chip);
 
-	if (check_gpio(gpio) < 0)
-		return -EINVAL;
-	reg = get_gpio_base(gpio);
+	dev_info(dev, "probed gpiochip%d with base %d\n",
+				dev->id, omapgpio->chip.base);
+
+	return 0;
+}
 
-	reg += OMAP_GPIO_DATAIN;
+static struct driver_d omap_gpio_driver = {
+	.name = "omap-gpio",
+	.probe = omap_gpio_probe,
+};
 
-	return (__raw_readl(reg) & (1 << get_gpio_index(gpio))) != 0;
+static int omap_gpio_add(void)
+{
+	register_driver(&omap_gpio_driver);
+	return 0;
 }
+coredevice_initcall(omap_gpio_add);
diff --git a/arch/arm/mach-omap/omap3_generic.c b/arch/arm/mach-omap/omap3_generic.c
index 4ab265a..0e9cd71 100644
--- a/arch/arm/mach-omap/omap3_generic.c
+++ b/arch/arm/mach-omap/omap3_generic.c
@@ -515,3 +515,22 @@ const struct gpmc_config omap3_nand_cfg = {
 	.base = 0x28000000,
 	.size = GPMC_SIZE_16M,
 };
+
+static int omap3_gpio_init(void)
+{
+	add_generic_device("omap-gpio", 0, NULL, 0x48310000,
+					0x100, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 1, NULL, 0x49050000,
+					0x100, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 2, NULL, 0x49052000,
+					0x100, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 3, NULL, 0x49054000,
+					0x100, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 4, NULL, 0x49056000,
+					0x100, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 5, NULL, 0x49058000,
+					0x100, IORESOURCE_MEM, NULL);
+
+	return 0;
+}
+coredevice_initcall(omap3_gpio_init);
diff --git a/arch/arm/mach-omap/omap4_generic.c b/arch/arm/mach-omap/omap4_generic.c
index 617d786..a159dfc 100644
--- a/arch/arm/mach-omap/omap4_generic.c
+++ b/arch/arm/mach-omap/omap4_generic.c
@@ -572,3 +572,22 @@ const struct gpmc_config omap4_nand_cfg = {
 	.base = 0x28000000,
 	.size = GPMC_SIZE_16M,
 };
+
+static int omap4_gpio_init(void)
+{
+	add_generic_device("omap-gpio", 0, NULL, 0x4a310100,
+				0x1000, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 1, NULL, 0x48055100,
+				0x1000, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 2, NULL, 0x48057100,
+				0x1000, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 3, NULL, 0x48059100,
+				0x1000, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 4, NULL, 0x4805b100,
+				0x1000, IORESOURCE_MEM, NULL);
+	add_generic_device("omap-gpio", 5, NULL, 0x4805d100,
+				0x1000, IORESOURCE_MEM, NULL);
+
+	return 0;
+}
+coredevice_initcall(omap4_gpio_init);
-- 
1.7.0.4


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Re: [PATCH 1/2] drivers gpio: Check for negativ gpio values

[Jan Lübbe]

On Mon, 2012-09-24 at 10:59 +0200, Teresa Gámez wrote:
>  static int gpio_is_valid(unsigned gpio)
>  {
> -	if (gpio < ARCH_NR_GPIOS)
> +	if (gpio < ARCH_NR_GPIOS && gpio >= 0)

For an 'unsigned gpio', gpio >= 0 is always true.

Regards,
Jan Lübbe
-- 
Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |


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Re: [PATCH 1/2] drivers gpio: Check for negativ gpio values

[Teresa Gamez]

Am 24.09.2012 11:16, schrieb Jan Lübbe:
> On Mon, 2012-09-24 at 10:59 +0200, Teresa Gámez wrote:
>>   static int gpio_is_valid(unsigned gpio)
>>   {
>> -	if (gpio < ARCH_NR_GPIOS)
>> +	if (gpio < ARCH_NR_GPIOS && gpio >= 0)
> For an 'unsigned gpio', gpio >= 0 is always true.
Thats true...
Ignore this one then.

Sorry, forgot to cc mailing list.

Teresa

> Regards,
> Jan Lübbe


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Re: [PATCH 1/2] drivers gpio: Check for negativ gpio values

[Jean-Christophe PLAGNIOL-VILLARD]

On 11:16 Mon 24 Sep     , Jan Lübbe wrote:
> On Mon, 2012-09-24 at 10:59 +0200, Teresa Gámez wrote:
> >  static int gpio_is_valid(unsigned gpio)
> >  {
> > -	if (gpio < ARCH_NR_GPIOS)
> > +	if (gpio < ARCH_NR_GPIOS && gpio >= 0)
> 
> For an 'unsigned gpio', gpio >= 0 is always true.
unsigned is wrong type gpio need to int

Best Regards,
J.

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Re: [PATCH 2/2] ARM OMAP: switch to gpiolib support

[Sascha Hauer]

Hi Teresa,

On Mon, Sep 24, 2012 at 10:59:36AM +0200, Teresa Gámez wrote:
> 
> Signed-off-by: Teresa Gámez <t.gamez@phytec.de>

Nice cleanup. Applied, thanks

Sascha

> ---
>  arch/arm/Kconfig                   |    1 +
>  arch/arm/mach-omap/gpio.c          |  171 ++++++++++++++++-------------------
>  arch/arm/mach-omap/omap3_generic.c |   19 ++++
>  arch/arm/mach-omap/omap4_generic.c |   19 ++++
>  4 files changed, 117 insertions(+), 93 deletions(-)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index a54ad03..7b7b058 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -58,6 +58,7 @@ config ARCH_NOMADIK
>  config ARCH_OMAP
>  	bool "TI OMAP"
>  	select HAS_DEBUG_LL
> +	select GPIOLIB
>  
>  config ARCH_PXA
>  	bool "Intel/Marvell PXA based"
> diff --git a/arch/arm/mach-omap/gpio.c b/arch/arm/mach-omap/gpio.c
> index 142cf52..d217550 100644
> --- a/arch/arm/mach-omap/gpio.c
> +++ b/arch/arm/mach-omap/gpio.c
> @@ -36,11 +36,10 @@
>   * published by the Free Software Foundation.
>   */
>  #include <common.h>
> -#include <mach/gpio.h>
>  #include <io.h>
>  #include <errno.h>
> -
> -#ifdef CONFIG_ARCH_OMAP3
> +#include <gpio.h>
> +#include <init.h>
>  
>  #define OMAP_GPIO_OE		0x0034
>  #define OMAP_GPIO_DATAIN	0x0038
> @@ -48,129 +47,115 @@
>  #define OMAP_GPIO_CLEARDATAOUT	0x0090
>  #define OMAP_GPIO_SETDATAOUT	0x0094
>  
> -static void __iomem *gpio_bank[] = {
> -	(void *)0x48310000,
> -	(void *)0x49050000,
> -	(void *)0x49052000,
> -	(void *)0x49054000,
> -	(void *)0x49056000,
> -	(void *)0x49058000,
> -};
> -#endif
> -
> -#ifdef CONFIG_ARCH_OMAP4
> -
> -#define OMAP_GPIO_OE		0x0134
> -#define OMAP_GPIO_DATAIN	0x0138
> -#define OMAP_GPIO_DATAOUT	0x013c
> -#define OMAP_GPIO_CLEARDATAOUT	0x0190
> -#define OMAP_GPIO_SETDATAOUT	0x0194
> -
> -static void __iomem *gpio_bank[] = {
> -	(void *)0x4a310000,
> -	(void *)0x48055000,
> -	(void *)0x48057000,
> -	(void *)0x48059000,
> -	(void *)0x4805b000,
> -	(void *)0x4805d000,
> +struct omap_gpio_chip {
> +	void __iomem *base;
> +	struct gpio_chip chip;
>  };
> -#endif
> -
> -static inline void __iomem *get_gpio_base(int gpio)
> -{
> -	return gpio_bank[gpio >> 5];
> -}
>  
> -static inline int get_gpio_index(int gpio)
> +static inline int omap_get_gpio_index(int gpio)
>  {
>  	return gpio & 0x1f;
>  }
>  
> -static inline int gpio_valid(int gpio)
> +static void omap_gpio_set_value(struct gpio_chip *chip,
> +					unsigned gpio, int value)
>  {
> -	if (gpio < 0)
> -		return -1;
> -	if (gpio / 32 < ARRAY_SIZE(gpio_bank))
> -		return 0;
> -	return -1;
> -}
> -
> -static int check_gpio(int gpio)
> -{
> -	if (gpio_valid(gpio) < 0) {
> -		printf("ERROR : check_gpio: invalid GPIO %d\n", gpio);
> -		return -1;
> -	}
> -	return 0;
> -}
> -
> -void gpio_set_value(unsigned gpio, int value)
> -{
> -	void __iomem *reg;
> +	struct omap_gpio_chip *omapgpio =
> +			container_of(chip, struct omap_gpio_chip, chip);
> +	void __iomem *base = omapgpio->base;
>  	u32 l = 0;
>  
> -	if (check_gpio(gpio) < 0)
> -		return;
> -
> -	reg = get_gpio_base(gpio);
> -
>  	if (value)
> -		reg += OMAP_GPIO_SETDATAOUT;
> +		base += OMAP_GPIO_SETDATAOUT;
>  	else
> -		reg += OMAP_GPIO_CLEARDATAOUT;
> -	l = 1 << get_gpio_index(gpio);
> +		base += OMAP_GPIO_CLEARDATAOUT;
> +
> +	l = 1 << omap_get_gpio_index(gpio);
>  
> -	__raw_writel(l, reg);
> +	writel(l, base);
>  }
>  
> -int gpio_direction_input(unsigned gpio)
> +static int omap_gpio_direction_input(struct gpio_chip *chip,
> +					unsigned gpio)
>  {
> -	void __iomem *reg;
> +	struct omap_gpio_chip *omapgpio =
> +			container_of(chip, struct omap_gpio_chip, chip);
> +	void __iomem *base = omapgpio->base;
>  	u32 val;
>  
> -	if (check_gpio(gpio) < 0)
> -		return -EINVAL;
> -
> -	reg = get_gpio_base(gpio);
> -
> -	reg += OMAP_GPIO_OE;
> +	base += OMAP_GPIO_OE;
>  
> -	val = __raw_readl(reg);
> -	val |= 1 << get_gpio_index(gpio);
> -	__raw_writel(val, reg);
> +	val = readl(base);
> +	val |= 1 << omap_get_gpio_index(gpio);
> +	writel(val, base);
>  
>  	return 0;
>  }
>  
> -int gpio_direction_output(unsigned gpio, int value)
> +static int omap_gpio_direction_output(struct gpio_chip *chip,
> +					unsigned gpio, int value)
>  {
> -	void __iomem *reg;
> +	struct omap_gpio_chip *omapgpio =
> +			container_of(chip, struct omap_gpio_chip, chip);
> +	void __iomem *base = omapgpio->base;
>  	u32 val;
>  
> -	if (check_gpio(gpio) < 0)
> -		return -EINVAL;
> -	reg = get_gpio_base(gpio);
> +	omap_gpio_set_value(chip, gpio, value);
>  
> -	gpio_set_value(gpio, value);
> +	base += OMAP_GPIO_OE;
>  
> -	reg += OMAP_GPIO_OE;
> -
> -	val = __raw_readl(reg);
> -	val &= ~(1 << get_gpio_index(gpio));
> -	__raw_writel(val, reg);
> +	val = readl(base);
> +	val &= ~(1 << omap_get_gpio_index(gpio));
> +	writel(val, base);
>  
>  	return 0;
>  }
>  
> -int gpio_get_value(unsigned gpio)
> +static int omap_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
> +{
> +	struct omap_gpio_chip *omapgpio =
> +			container_of(chip, struct omap_gpio_chip, chip);
> +	void __iomem *base = omapgpio->base;
> +
> +	base  += OMAP_GPIO_DATAIN;
> +
> +	return (readl(base) & (1 << omap_get_gpio_index(gpio))) != 0;
> +
> +}
> +
> +static struct gpio_ops omap_gpio_ops = {
> +	.direction_input = omap_gpio_direction_input,
> +	.direction_output = omap_gpio_direction_output,
> +	.get = omap_gpio_get_value,
> +	.set = omap_gpio_set_value,
> +};
> +
> +static int omap_gpio_probe(struct device_d *dev)
>  {
> -	void __iomem *reg;
> +	struct omap_gpio_chip *omapgpio;
> +
> +	omapgpio = xzalloc(sizeof(*omapgpio));
> +	omapgpio->base = dev_request_mem_region(dev, 0);
> +	omapgpio->chip.ops = &omap_gpio_ops;
> +	omapgpio->chip.base = -1;
> +	omapgpio->chip.ngpio = 32;
> +	omapgpio->chip.dev = dev;
> +	gpiochip_add(&omapgpio->chip);
>  
> -	if (check_gpio(gpio) < 0)
> -		return -EINVAL;
> -	reg = get_gpio_base(gpio);
> +	dev_info(dev, "probed gpiochip%d with base %d\n",
> +				dev->id, omapgpio->chip.base);
> +
> +	return 0;
> +}
>  
> -	reg += OMAP_GPIO_DATAIN;
> +static struct driver_d omap_gpio_driver = {
> +	.name = "omap-gpio",
> +	.probe = omap_gpio_probe,
> +};
>  
> -	return (__raw_readl(reg) & (1 << get_gpio_index(gpio))) != 0;
> +static int omap_gpio_add(void)
> +{
> +	register_driver(&omap_gpio_driver);
> +	return 0;
>  }
> +coredevice_initcall(omap_gpio_add);
> diff --git a/arch/arm/mach-omap/omap3_generic.c b/arch/arm/mach-omap/omap3_generic.c
> index 4ab265a..0e9cd71 100644
> --- a/arch/arm/mach-omap/omap3_generic.c
> +++ b/arch/arm/mach-omap/omap3_generic.c
> @@ -515,3 +515,22 @@ const struct gpmc_config omap3_nand_cfg = {
>  	.base = 0x28000000,
>  	.size = GPMC_SIZE_16M,
>  };
> +
> +static int omap3_gpio_init(void)
> +{
> +	add_generic_device("omap-gpio", 0, NULL, 0x48310000,
> +					0x100, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 1, NULL, 0x49050000,
> +					0x100, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 2, NULL, 0x49052000,
> +					0x100, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 3, NULL, 0x49054000,
> +					0x100, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 4, NULL, 0x49056000,
> +					0x100, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 5, NULL, 0x49058000,
> +					0x100, IORESOURCE_MEM, NULL);
> +
> +	return 0;
> +}
> +coredevice_initcall(omap3_gpio_init);
> diff --git a/arch/arm/mach-omap/omap4_generic.c b/arch/arm/mach-omap/omap4_generic.c
> index 617d786..a159dfc 100644
> --- a/arch/arm/mach-omap/omap4_generic.c
> +++ b/arch/arm/mach-omap/omap4_generic.c
> @@ -572,3 +572,22 @@ const struct gpmc_config omap4_nand_cfg = {
>  	.base = 0x28000000,
>  	.size = GPMC_SIZE_16M,
>  };
> +
> +static int omap4_gpio_init(void)
> +{
> +	add_generic_device("omap-gpio", 0, NULL, 0x4a310100,
> +				0x1000, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 1, NULL, 0x48055100,
> +				0x1000, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 2, NULL, 0x48057100,
> +				0x1000, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 3, NULL, 0x48059100,
> +				0x1000, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 4, NULL, 0x4805b100,
> +				0x1000, IORESOURCE_MEM, NULL);
> +	add_generic_device("omap-gpio", 5, NULL, 0x4805d100,
> +				0x1000, IORESOURCE_MEM, NULL);
> +
> +	return 0;
> +}
> +coredevice_initcall(omap4_gpio_init);
> -- 
> 1.7.0.4
> 
> 
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