From: Reinder de Haan <patchesrdh@xxxxxxxxx>
In some cases it is useful to be able to get a reset-controller by
index rather then by name. E.g. for a generic ip-block driver such
as the ehci-platform drivers which needs to support more then one reset,
without knowing the names of the reset lines (as that would make it
non generic).
Signed-off-by: Reinder de Haan <patchesrdh@xxxxxxxxx>
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/reset/core.c | 23 +++++++++++++++++++----
include/linux/reset.h | 8 ++++++++
2 files changed, 27 insertions(+), 4 deletions(-)
diff --git a/drivers/reset/core.c b/drivers/reset/core.c
index 7955e00..b2405d8 100644
--- a/drivers/reset/core.c
+++ b/drivers/reset/core.c
@@ -152,16 +152,31 @@ EXPORT_SYMBOL_GPL(reset_control_status);
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);
+}
+
+/**
+ * of_reset_control_get_by_index - Lookup and obtain a reference to a
+ * reset controller.
+ * @node: device to be reset by the controller
+ * @index: reset line index
+ *
+ * Returns a struct reset_control or IS_ERR() condition containing errno.
+ */
+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)
diff --git a/include/linux/reset.h b/include/linux/reset.h
index 7f65f9c..8f56b66 100644
--- 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 +109,11 @@ 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(-EINVAL);
+}
#endif /* CONFIG_RESET_CONTROLLER */
#endif
--
2.5.0
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