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path: root/drivers/of/base.c
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Diffstat (limited to 'drivers/of/base.c')
-rw-r--r--drivers/of/base.c128
1 files changed, 107 insertions, 21 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index af3b22ac7627..538e3cfad23e 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -45,7 +45,8 @@ struct alias_prop {
static LIST_HEAD(aliases_lookup);
-struct device_node *allnodes;
+struct device_node *of_allnodes;
+EXPORT_SYMBOL(of_allnodes);
struct device_node *of_chosen;
struct device_node *of_aliases;
@@ -199,7 +200,7 @@ struct device_node *of_find_all_nodes(struct device_node *prev)
struct device_node *np;
read_lock(&devtree_lock);
- np = prev ? prev->allnext : allnodes;
+ np = prev ? prev->allnext : of_allnodes;
for (; np != NULL; np = np->allnext)
if (of_node_get(np))
break;
@@ -422,7 +423,7 @@ EXPORT_SYMBOL(of_get_child_by_name);
*/
struct device_node *of_find_node_by_path(const char *path)
{
- struct device_node *np = allnodes;
+ struct device_node *np = of_allnodes;
read_lock(&devtree_lock);
for (; np; np = np->allnext) {
@@ -452,7 +453,7 @@ struct device_node *of_find_node_by_name(struct device_node *from,
struct device_node *np;
read_lock(&devtree_lock);
- np = from ? from->allnext : allnodes;
+ np = from ? from->allnext : of_allnodes;
for (; np; np = np->allnext)
if (np->name && (of_node_cmp(np->name, name) == 0)
&& of_node_get(np))
@@ -481,7 +482,7 @@ struct device_node *of_find_node_by_type(struct device_node *from,
struct device_node *np;
read_lock(&devtree_lock);
- np = from ? from->allnext : allnodes;
+ np = from ? from->allnext : of_allnodes;
for (; np; np = np->allnext)
if (np->type && (of_node_cmp(np->type, type) == 0)
&& of_node_get(np))
@@ -512,7 +513,7 @@ struct device_node *of_find_compatible_node(struct device_node *from,
struct device_node *np;
read_lock(&devtree_lock);
- np = from ? from->allnext : allnodes;
+ np = from ? from->allnext : of_allnodes;
for (; np; np = np->allnext) {
if (type
&& !(np->type && (of_node_cmp(np->type, type) == 0)))
@@ -545,7 +546,7 @@ struct device_node *of_find_node_with_property(struct device_node *from,
struct property *pp;
read_lock(&devtree_lock);
- np = from ? from->allnext : allnodes;
+ np = from ? from->allnext : of_allnodes;
for (; np; np = np->allnext) {
for (pp = np->properties; pp; pp = pp->next) {
if (of_prop_cmp(pp->name, prop_name) == 0) {
@@ -594,27 +595,35 @@ const struct of_device_id *of_match_node(const struct of_device_id *matches,
EXPORT_SYMBOL(of_match_node);
/**
- * of_find_matching_node - Find a node based on an of_device_id match
- * table.
+ * of_find_matching_node_and_match - Find a node based on an of_device_id
+ * match table.
* @from: The node to start searching from or NULL, the node
* you pass will not be searched, only the next one
* will; typically, you pass what the previous call
* returned. of_node_put() will be called on it
* @matches: array of of device match structures to search in
+ * @match Updated to point at the matches entry which matched
*
* Returns a node pointer with refcount incremented, use
* of_node_put() on it when done.
*/
-struct device_node *of_find_matching_node(struct device_node *from,
- const struct of_device_id *matches)
+struct device_node *of_find_matching_node_and_match(struct device_node *from,
+ const struct of_device_id *matches,
+ const struct of_device_id **match)
{
struct device_node *np;
+ if (match)
+ *match = NULL;
+
read_lock(&devtree_lock);
- np = from ? from->allnext : allnodes;
+ np = from ? from->allnext : of_allnodes;
for (; np; np = np->allnext) {
- if (of_match_node(matches, np) && of_node_get(np))
+ if (of_match_node(matches, np) && of_node_get(np)) {
+ if (match)
+ *match = matches;
break;
+ }
}
of_node_put(from);
read_unlock(&devtree_lock);
@@ -661,7 +670,7 @@ struct device_node *of_find_node_by_phandle(phandle handle)
struct device_node *np;
read_lock(&devtree_lock);
- for (np = allnodes; np; np = np->allnext)
+ for (np = of_allnodes; np; np = np->allnext)
if (np->phandle == handle)
break;
of_node_get(np);
@@ -671,12 +680,89 @@ struct device_node *of_find_node_by_phandle(phandle handle)
EXPORT_SYMBOL(of_find_node_by_phandle);
/**
+ * of_property_read_u8_array - Find and read an array of u8 from a property.
+ *
+ * @np: device node from which the property value is to be read.
+ * @propname: name of the property to be searched.
+ * @out_value: pointer to return value, modified only if return value is 0.
+ * @sz: number of array elements to read
+ *
+ * Search for a property in a device node and read 8-bit value(s) from
+ * it. Returns 0 on success, -EINVAL if the property does not exist,
+ * -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ * dts entry of array should be like:
+ * property = /bits/ 8 <0x50 0x60 0x70>;
+ *
+ * The out_value is modified only if a valid u8 value can be decoded.
+ */
+int of_property_read_u8_array(const struct device_node *np,
+ const char *propname, u8 *out_values, size_t sz)
+{
+ struct property *prop = of_find_property(np, propname, NULL);
+ const u8 *val;
+
+ if (!prop)
+ return -EINVAL;
+ if (!prop->value)
+ return -ENODATA;
+ if ((sz * sizeof(*out_values)) > prop->length)
+ return -EOVERFLOW;
+
+ val = prop->value;
+ while (sz--)
+ *out_values++ = *val++;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_u8_array);
+
+/**
+ * of_property_read_u16_array - Find and read an array of u16 from a property.
+ *
+ * @np: device node from which the property value is to be read.
+ * @propname: name of the property to be searched.
+ * @out_value: pointer to return value, modified only if return value is 0.
+ * @sz: number of array elements to read
+ *
+ * Search for a property in a device node and read 16-bit value(s) from
+ * it. Returns 0 on success, -EINVAL if the property does not exist,
+ * -ENODATA if property does not have a value, and -EOVERFLOW if the
+ * property data isn't large enough.
+ *
+ * dts entry of array should be like:
+ * property = /bits/ 16 <0x5000 0x6000 0x7000>;
+ *
+ * The out_value is modified only if a valid u16 value can be decoded.
+ */
+int of_property_read_u16_array(const struct device_node *np,
+ const char *propname, u16 *out_values, size_t sz)
+{
+ struct property *prop = of_find_property(np, propname, NULL);
+ const __be16 *val;
+
+ if (!prop)
+ return -EINVAL;
+ if (!prop->value)
+ return -ENODATA;
+ if ((sz * sizeof(*out_values)) > prop->length)
+ return -EOVERFLOW;
+
+ val = prop->value;
+ while (sz--)
+ *out_values++ = be16_to_cpup(val++);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_property_read_u16_array);
+
+/**
* of_property_read_u32_array - Find and read an array of 32 bit integers
* from a property.
*
* @np: device node from which the property value is to be read.
* @propname: name of the property to be searched.
* @out_value: pointer to return value, modified only if return value is 0.
+ * @sz: number of array elements to read
*
* Search for a property in a device node and read 32-bit value(s) from
* it. Returns 0 on success, -EINVAL if the property does not exist,
@@ -893,8 +979,8 @@ EXPORT_SYMBOL_GPL(of_property_count_strings);
* Returns the device_node pointer with refcount incremented. Use
* of_node_put() on it when done.
*/
-struct device_node *
-of_parse_phandle(struct device_node *np, const char *phandle_name, int index)
+struct device_node *of_parse_phandle(const struct device_node *np,
+ const char *phandle_name, int index)
{
const __be32 *phandle;
int size;
@@ -1169,9 +1255,9 @@ void of_attach_node(struct device_node *np)
write_lock_irqsave(&devtree_lock, flags);
np->sibling = np->parent->child;
- np->allnext = allnodes;
+ np->allnext = of_allnodes;
np->parent->child = np;
- allnodes = np;
+ of_allnodes = np;
write_unlock_irqrestore(&devtree_lock, flags);
}
@@ -1192,11 +1278,11 @@ void of_detach_node(struct device_node *np)
if (!parent)
goto out_unlock;
- if (allnodes == np)
- allnodes = np->allnext;
+ if (of_allnodes == np)
+ of_allnodes = np->allnext;
else {
struct device_node *prev;
- for (prev = allnodes;
+ for (prev = of_allnodes;
prev->allnext != np;
prev = prev->allnext)
;