reset: add of_reset_control_get_by_index()

Add of_reset_control_get_by_index() to allow the drivers to get reset
device without knowing its name.

Signed-off-by: Vince Hsu <vinceh@nvidia.com>
[jonathanh@nvidia.com: Updated stub function to return -ENOTSUPP instead
 of -ENOSYS which should only be used for system calls.]
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>

diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 7955e00..81ae17d 100644 (file)
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -141,27 +141,24 @@ int reset_control_status(struct reset_control *rstc)
 EXPORT_SYMBOL_GPL(reset_control_status);
 
 /**
- * of_reset_control_get - Lookup and obtain a reference to a reset controller.
+ * of_reset_control_get_by_index - Lookup and obtain a reference to a reset
+ * controller by index.
  * @node: device to be reset by the controller
- * @id: reset line name
- *
- * Returns a struct reset_control or IS_ERR() condition containing errno.
+ * @index: index of the reset controller
  *
- * Use of id names is optional.
+ * This is to be used to perform a list of resets for a device or power domain
+ * in whatever order. Returns a struct reset_control or IS_ERR() condition
+ * containing errno.
  */
-struct reset_control *of_reset_control_get(struct device_node *node,
-                                          const char *id)
+struct reset_control *of_reset_control_get_by_index(struct device_node *node,
+                                          int index)
 {
        struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER);
        struct reset_controller_dev *r, *rcdev;
        struct of_phandle_args args;
-       int index = 0;
        int rstc_id;
        int ret;
 
-       if (id)
-               index = of_property_match_string(node,
-                                                "reset-names", id);
        ret = of_parse_phandle_with_args(node, "resets", "#reset-cells",
                                         index, &args);
        if (ret)
@@ -202,6 +199,27 @@ struct reset_control *of_reset_control_get(struct device_node *node,
 
        return rstc;
 }
+EXPORT_SYMBOL_GPL(of_reset_control_get_by_index);
+
+/**
+ * of_reset_control_get - Lookup and obtain a reference to a reset controller.
+ * @node: device to be reset by the controller
+ * @id: reset line name
+ *
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ *
+ * Use of id names is optional.
+ */
+struct reset_control *of_reset_control_get(struct device_node *node,
+                                          const char *id)
+{
+       int index = 0;
+
+       if (id)
+               index = of_property_match_string(node,
+                                                "reset-names", id);
+       return of_reset_control_get_by_index(node, index);
+}
 EXPORT_SYMBOL_GPL(of_reset_control_get);
 
 /**

diff --git a/include/linux/reset.h b/include/linux/reset.h
index 7f65f9c..6db74ad 100644 (file)
--- a/include/linux/reset.h
+++ b/include/linux/reset.h
@@ -38,6 +38,9 @@ static inline struct reset_control *devm_reset_control_get_optional(
 struct reset_control *of_reset_control_get(struct device_node *node,
                                           const char *id);
 
+struct reset_control *of_reset_control_get_by_index(
+                                       struct device_node *node, int index);
+
 #else
 
 static inline int reset_control_reset(struct reset_control *rstc)
@@ -106,6 +109,12 @@ static inline struct reset_control *of_reset_control_get(
        return ERR_PTR(-ENOSYS);
 }
 
+static inline struct reset_control *of_reset_control_get_by_index(
+                               struct device_node *node, int index)
+{
+       return ERR_PTR(-ENOTSUPP);
+}
+
 #endif /* CONFIG_RESET_CONTROLLER */
 
 #endif