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authorGrant Likely <grant.likely@secretlab.ca>2013-02-12 21:48:37 +0400
committerGrant Likely <grant.likely@secretlab.ca>2013-02-13 14:11:53 +0400
commite80beb27d2f81a1c3c8887e0e0a82d77bb392d28 (patch)
tree1f81c7ffb20b23d5f7a157e996fbb176779af88a /include/linux/of_gpio.h
parentbd69f73f2c81eed9a398708b8c4bb3409ba1b0f9 (diff)
downloadlinux-e80beb27d2f81a1c3c8887e0e0a82d77bb392d28.tar.xz
gpio: Make of_count_named_gpios() use new of_count_phandle_with_args()
This patch replaces the horribly coded of_count_named_gpios() with a call to of_count_phandle_with_args() which is far more efficient. This also changes the return value of of_gpio_count() & of_gpio_named_count() from 'unsigned int' to 'int' so that it can return an error code. All the users of that function are fixed up to correctly handle a negative return value. v2: Split GPIO portion into a separate patch Tested-by: Andreas Larsson <andreas@gaisler.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Cc: Linus Walleij <linus.walleij@linaro.org> Cc: Rob Herring <rob.herring@calxeda.com>
Diffstat (limited to 'include/linux/of_gpio.h')
-rw-r--r--include/linux/of_gpio.h40
1 files changed, 23 insertions, 17 deletions
diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index c454f5796747..a83dc6f5008e 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -50,9 +50,6 @@ static inline struct of_mm_gpio_chip *to_of_mm_gpio_chip(struct gpio_chip *gc)
extern int of_get_named_gpio_flags(struct device_node *np,
const char *list_name, int index, enum of_gpio_flags *flags);
-extern unsigned int of_gpio_named_count(struct device_node *np,
- const char* propname);
-
extern int of_mm_gpiochip_add(struct device_node *np,
struct of_mm_gpio_chip *mm_gc);
@@ -71,12 +68,6 @@ static inline int of_get_named_gpio_flags(struct device_node *np,
return -ENOSYS;
}
-static inline unsigned int of_gpio_named_count(struct device_node *np,
- const char* propname)
-{
- return 0;
-}
-
static inline int of_gpio_simple_xlate(struct gpio_chip *gc,
const struct of_phandle_args *gpiospec,
u32 *flags)
@@ -90,22 +81,37 @@ static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
#endif /* CONFIG_OF_GPIO */
/**
- * of_gpio_count - Count GPIOs for a device
+ * of_gpio_named_count() - Count GPIOs for a device
* @np: device node to count GPIOs for
+ * @propname: property name containing gpio specifier(s)
*
* The function returns the count of GPIOs specified for a node.
+ * Note that the empty GPIO specifiers count too. Returns either
+ * Number of gpios defined in property,
+ * -EINVAL for an incorrectly formed gpios property, or
+ * -ENOENT for a missing gpios property
*
- * Note that the empty GPIO specifiers counts too. For example,
- *
+ * Example:
* gpios = <0
- * &pio1 1 2
+ * &gpio1 1 2
* 0
- * &pio2 3 4>;
+ * &gpio2 3 4>;
+ *
+ * The above example defines four GPIOs, two of which are not specified.
+ * This function will return '4'
+ */
+static inline int of_gpio_named_count(struct device_node *np, const char* propname)
+{
+ return of_count_phandle_with_args(np, propname, "#gpio-cells");
+}
+
+/**
+ * of_gpio_count() - Count GPIOs for a device
+ * @np: device node to count GPIOs for
*
- * defines four GPIOs (so this function will return 4), two of which
- * are not specified.
+ * Same as of_gpio_named_count, but hard coded to use the 'gpios' property
*/
-static inline unsigned int of_gpio_count(struct device_node *np)
+static inline int of_gpio_count(struct device_node *np)
{
return of_gpio_named_count(np, "gpios");
}