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Subject[PATCH v2 2/5] interconnect: Add of_icc_get_by_index() helper function
Date
This is the same as the traditional of_icc_get() function, but the
difference is that it takes index as an argument, instead of name.

Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
---
drivers/interconnect/core.c | 45 ++++++++++++++++++++++++++++--------
include/linux/interconnect.h | 6 +++++
2 files changed, 41 insertions(+), 10 deletions(-)

diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 871eb4bc4efc..a7c3c262c974 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -295,9 +295,9 @@ static struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec)
}

/**
- * of_icc_get() - get a path handle from a DT node based on name
+ * of_icc_get_by_index() - get a path handle from a DT node based on index
* @dev: device pointer for the consumer device
- * @name: interconnect path name
+ * @idx: interconnect path index
*
* This function will search for a path between two endpoints and return an
* icc_path handle on success. Use icc_put() to release constraints when they
@@ -309,13 +309,12 @@ static struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec)
* Return: icc_path pointer on success or ERR_PTR() on error. NULL is returned
* when the API is disabled or the "interconnects" DT property is missing.
*/
-struct icc_path *of_icc_get(struct device *dev, const char *name)
+struct icc_path *of_icc_get_by_index(struct device *dev, int idx)
{
struct icc_path *path = ERR_PTR(-EPROBE_DEFER);
struct icc_node *src_node, *dst_node;
struct device_node *np = NULL;
struct of_phandle_args src_args, dst_args;
- int idx = 0;
int ret;

if (!dev || !dev->of_node)
@@ -335,12 +334,6 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
* lets support only global ids and extend this in the future if needed
* without breaking DT compatibility.
*/
- if (name) {
- idx = of_property_match_string(np, "interconnect-names", name);
- if (idx < 0)
- return ERR_PTR(idx);
- }
-
ret = of_parse_phandle_with_args(np, "interconnects",
"#interconnect-cells", idx * 2,
&src_args);
@@ -383,6 +376,38 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)

return path;
}
+
+/**
+ * of_icc_get() - get a path handle from a DT node based on name
+ * @dev: device pointer for the consumer device
+ * @name: interconnect path name
+ *
+ * This function will search for a path between two endpoints and return an
+ * icc_path handle on success. Use icc_put() to release constraints when they
+ * are not needed anymore.
+ * If the interconnect API is disabled, NULL is returned and the consumer
+ * drivers will still build. Drivers are free to handle this specifically,
+ * but they don't have to.
+ *
+ * Return: icc_path pointer on success or ERR_PTR() on error. NULL is returned
+ * when the API is disabled or the "interconnects" DT property is missing.
+ */
+struct icc_path *of_icc_get(struct device *dev, const char *name)
+{
+ int idx = 0;
+
+ if (!dev || !dev->of_node)
+ return ERR_PTR(-ENODEV);
+
+ if (name) {
+ idx = of_property_match_string(dev->of_node,
+ "interconnect-names", name);
+ if (idx < 0)
+ return ERR_PTR(idx);
+ }
+
+ return of_icc_get_by_index(dev, idx);
+}
EXPORT_SYMBOL_GPL(of_icc_get);

/**
diff --git a/include/linux/interconnect.h b/include/linux/interconnect.h
index dc25864755ba..0e430b3b6519 100644
--- a/include/linux/interconnect.h
+++ b/include/linux/interconnect.h
@@ -28,6 +28,7 @@ struct device;
struct icc_path *icc_get(struct device *dev, const int src_id,
const int dst_id);
struct icc_path *of_icc_get(struct device *dev, const char *name);
+struct icc_path *of_icc_get_by_index(struct device *dev, int idx);
void icc_put(struct icc_path *path);
int icc_set_bw(struct icc_path *path, u32 avg_bw, u32 peak_bw);

@@ -45,6 +46,11 @@ static inline struct icc_path *of_icc_get(struct device *dev,
return NULL;
}

+struct icc_path *of_icc_get_by_index(struct device *dev, int idx)
+{
+ return NULL;
+}
+
static inline void icc_put(struct icc_path *path)
{
}
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