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of/gpio: export of_gpio_simple_xlate 

Allow GPIO drivers to use of_gpio_simple_xlate.  This is useful for the
generic GPIO driver for example where gpio_chip is embedded in
bgpio_chip and doesn't need of_mm_gpio_chip but has a simple 1:1 GPIO
mapping.

Cc: Anton Vorontsov <avorontsov@ru.mvista.com>
Cc: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Jamie Iles 2011-07-28 16:25:41 +01:00 committed by Grant Likely
parent 95b6886526
commit 3038bbdf74
2 changed files with 12 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/of/gpio.c
View File

@ -127,8 +127,8 @@ EXPORT_SYMBOL(of_gpio_count);
* gpio chips. This function performs only one sanity check: whether gpio
* is less than ngpios (that is specified in the gpio_chip).
*/
static int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
const void *gpio_spec, u32 *flags)
int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
const void *gpio_spec, u32 *flags)
{
const __be32 *gpio = gpio_spec;
const u32 n = be32_to_cpup(gpio);
@ -152,6 +152,7 @@ static int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
return n;
}
EXPORT_SYMBOL(of_gpio_simple_xlate);
/**
* of_mm_gpiochip_add - Add memory mapped GPIO chip (bank)

9
include/linux/of_gpio.h
View File

@ -57,6 +57,8 @@ extern int of_mm_gpiochip_add(struct device_node *np,
extern void of_gpiochip_add(struct gpio_chip *gc);
extern void of_gpiochip_remove(struct gpio_chip *gc);
extern struct gpio_chip *of_node_to_gpiochip(struct device_node *np);
extern int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
const void *gpio_spec, u32 *flags);
#else /* CONFIG_OF_GPIO */
@ -72,6 +74,13 @@ static inline unsigned int of_gpio_count(struct device_node *np)
return 0;
}
static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
struct device_node *np,
const void *gpio_spec, u32 *flags)
{
return -ENOSYS;
}
static inline void of_gpiochip_add(struct gpio_chip *gc) { }
static inline void of_gpiochip_remove(struct gpio_chip *gc) { }