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>
diff --git a/include/linux/of_gpio.h b/include/linux/of_gpio.h
index b254052..81733d1 100644
--- a/include/linux/of_gpio.h
+++ b/include/linux/of_gpio.h
@@ -50,7 +50,8 @@
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 @@
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 @@
#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