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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>
This commit is contained in:
Georgi Djakov 2020-05-12 15:53:20 +03:00
parent ae83d0b416
commit 1597d45328
2 changed files with 60 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
drivers/interconnect/core.c
View File

@ -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);
/**

6
include/linux/interconnect.h
View File

@ -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);
void icc_set_tag(struct icc_path *path, u32 tag);
@ -46,6 +47,11 @@ static inline struct icc_path *of_icc_get(struct device *dev,
return NULL;
}
static inline struct icc_path *of_icc_get_by_index(struct device *dev, int idx)
{
return NULL;
}
static inline void icc_put(struct icc_path *path)
{
}