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authorGeorgi Djakov <georgi.djakov@linaro.org>2020-05-12 15:53:20 +0300
committerGeorgi Djakov <georgi.djakov@linaro.org>2020-05-13 14:06:32 +0300
commit1597d453289b385237628cd96d57d147632ab105 (patch)
tree9af03d1e45b6202065fdd5f27aaf55c8e56c6e5d /drivers/interconnect
parentae83d0b416db002fe95601e7f97f64b59514d936 (diff)
downloadlinux-1597d453289b385237628cd96d57d147632ab105.tar.xz
interconnect: Add of_icc_get_by_index() helper function
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. Reviewed-by: Matthias Kaehlcke <mka@chromium.org> Reviewed-by: Sibi Sankar <sibis@codeaurora.org> Link: https://lore.kernel.org/r/20200512125327.1868-4-georgi.djakov@linaro.org Signed-off-by: Georgi Djakov <georgi.djakov@linaro.org>
Diffstat (limited to 'drivers/interconnect')
-rw-r--r--drivers/interconnect/core.c72
1 files changed, 54 insertions, 18 deletions
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index 2c6515e3ecf1..aba5d38ea9d1 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -351,9 +351,9 @@ 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
@@ -365,13 +365,12 @@ 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_path *path;
struct icc_node *src_node, *dst_node;
- struct device_node *np = NULL;
+ struct device_node *np;
struct of_phandle_args src_args, dst_args;
- int idx = 0;
int ret;
if (!dev || !dev->of_node)
@@ -391,12 +390,6 @@ 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);
@@ -439,12 +432,8 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
return path;
}
- if (name)
- path->name = kstrdup_const(name, GFP_KERNEL);
- else
- path->name = kasprintf(GFP_KERNEL, "%s-%s",
- src_node->name, dst_node->name);
-
+ path->name = kasprintf(GFP_KERNEL, "%s-%s",
+ src_node->name, dst_node->name);
if (!path->name) {
kfree(path);
return ERR_PTR(-ENOMEM);
@@ -452,6 +441,53 @@ struct icc_path *of_icc_get(struct device *dev, const char *name)
return path;
}
+EXPORT_SYMBOL_GPL(of_icc_get_by_index);
+
+/**
+ * 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)
+{
+ struct device_node *np;
+ int idx = 0;
+
+ if (!dev || !dev->of_node)
+ return ERR_PTR(-ENODEV);
+
+ np = dev->of_node;
+
+ /*
+ * When the consumer DT node do not have "interconnects" property
+ * return a NULL path to skip setting constraints.
+ */
+ if (!of_find_property(np, "interconnects", NULL))
+ return NULL;
+
+ /*
+ * We use a combination of phandle and specifier for endpoint. For now
+ * 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);
+ }
+
+ return of_icc_get_by_index(dev, idx);
+}
EXPORT_SYMBOL_GPL(of_icc_get);
/**