OF: gpio: convert DT based gpio handling to new OF API

This creates a Linux OF API compatible counterpart of of_get_named_gpio_flags.
Existing of_get_named_gpio is converted to a static inline function, which is
in the corresponding of_gpio.h include. While at it, drivers/of/gpio.c is
also renamed to drivers/of/of_gpio.c to follow the of_ prefix naming scheme.
The new include is also added to existing users of of_get_named_gpio.

Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 44 insertions, 0 deletions

diff --git a/include/of_gpio.h b/include/of_gpio.h
new file mode 100644
index 0000000000..50536a8a38
--- /dev/null
+++ b/include/of_gpio.h
@@ -0,0 +1,44 @@
+/*
+ * OF helpers for the GPIO API
+ *
+ * based on Linux OF_GPIO API
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifndef __OF_GPIO_H
+#define __OF_GPIO_H
+
+/*
+ * This is Linux-specific flags. By default controllers' and Linux' mapping
+ * match, but GPIO controllers are free to translate their own flags to
+ * Linux-specific in their .xlate callback. Though, 1:1 mapping is recommended.
+ */
+enum of_gpio_flags {
+	OF_GPIO_ACTIVE_LOW = 0x1,
+};
+
+#ifdef CONFIG_OFTREE
+extern int of_get_named_gpio_flags(struct device_node *np,
+		const char *list_name, int index, enum of_gpio_flags *flags);
+
+#else /* CONFIG_OFTREE */
+
+static inline int of_get_named_gpio_flags(struct device_node *np,
+		const char *list_name, int index, enum of_gpio_flags *flags)
+{
+	return -ENOSYS;
+}
+
+#endif /* CONFIG_OFTREE */
+
+static inline int of_get_named_gpio(struct device_node *np,
+				const char *list_name, int index)
+{
+	return of_get_named_gpio_flags(np, list_name, index, NULL);
+}
+
+#endif