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authorJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>2012-02-02 19:20:01 +0400
committerGrant Likely <grant.likely@secretlab.ca>2012-02-06 10:08:30 +0400
commitff64abefb6680dfc2aca7ecaa5e695949e7335c9 (patch)
tree8e580bc26cb65edf3135b25e29ddf8f77d776569
parent9467d298e92455e6fd411d7ef1f367ced940587c (diff)
downloadlinux-ff64abefb6680dfc2aca7ecaa5e695949e7335c9.tar.xz
of_gpio: add support of of_gpio_named_count to be able to count named gpio
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Cc: devicetree-discuss@lists.ozlabs.org Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
-rw-r--r--drivers/of/gpio.c9
-rw-r--r--include/linux/of_gpio.h27
2 files changed, 30 insertions, 6 deletions
diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c
index 7e62d15d60f6..e034b38590a8 100644
--- a/drivers/of/gpio.c
+++ b/drivers/of/gpio.c
@@ -78,8 +78,9 @@ err0:
EXPORT_SYMBOL(of_get_named_gpio_flags);
/**
- * 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.
*
@@ -93,14 +94,14 @@ EXPORT_SYMBOL(of_get_named_gpio_flags);
* defines four GPIOs (so this function will return 4), two of which
* are not specified.
*/
-unsigned int of_gpio_count(struct device_node *np)
+unsigned int of_gpio_named_count(struct device_node *np, const char* propname)
{
unsigned int cnt = 0;
do {
int ret;
- ret = of_parse_phandle_with_args(np, "gpios", "#gpio-cells",
+ ret = of_parse_phandle_with_args(np, propname, "#gpio-cells",
cnt, NULL);
/* A hole in the gpios = <> counts anyway. */
if (ret < 0 && ret != -EEXIST)
@@ -109,7 +110,7 @@ unsigned int of_gpio_count(struct device_node *np)
return cnt;
}
-EXPORT_SYMBOL(of_gpio_count);
+EXPORT_SYMBOL(of_gpio_named_count);
/**
* of_gpio_simple_xlate - translate gpio_spec to the GPIO number and flags
diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index b254052a49d7..81733d12cbea 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -50,7 +50,8 @@ 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_count(struct device_node *np);
+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);
@@ -71,7 +72,8 @@ static inline int of_get_named_gpio_flags(struct device_node *np,
return -ENOSYS;
}
-static inline unsigned int of_gpio_count(struct device_node *np)
+static inline unsigned int of_gpio_named_count(struct device_node *np,
+ const char* propname)
{
return 0;
}
@@ -89,6 +91,27 @@ static inline void of_gpiochip_remove(struct gpio_chip *gc) { }
#endif /* CONFIG_OF_GPIO */
/**
+ * of_gpio_count - Count GPIOs for a device
+ * @np: device node to count GPIOs for
+ *
+ * The function returns the count of GPIOs specified for a node.
+ *
+ * Note that the empty GPIO specifiers counts too. For example,
+ *
+ * gpios = <0
+ * &pio1 1 2
+ * 0
+ * &pio2 3 4>;
+ *
+ * defines four GPIOs (so this function will return 4), two of which
+ * are not specified.
+ */
+static inline unsigned int of_gpio_count(struct device_node *np)
+{
+ return of_gpio_named_count(np, "gpios");
+}
+
+/**
* of_get_gpio_flags() - Get a GPIO number and flags to use with GPIO API
* @np: device node to get GPIO from
* @index: index of the GPIO