dm: core: add ofnode and dev function to iterate on node property
Add functions to iterate on all property with livetree
- dev_read_first_prop
- dev_read_next_prop
- dev_read_prop_by_prop
and
- ofnode_get_first_property
- ofnode_get_next_property
- ofnode_get_property_by_prop
And helper: dev_for_each_property
For example:
struct ofprop property;
dev_for_each_property(property, config) {
value = dev_read_prop_by_prop(&property, &propname, &len);
or:
for (res = ofnode_get_first_property(node, &property);
!res;
res = ofnode_get_next_property(&property))
{
value = ofnode_get_property_by_prop(&property, &propname, &len);
....
}
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/include/dm/of_access.h b/include/dm/of_access.h
index 92876b3..f95a00d 100644
--- a/include/dm/of_access.h
+++ b/include/dm/of_access.h
@@ -104,6 +104,46 @@
int *lenp);
/**
+ * of_get_first_property()- get to the pointer of the first property
+ *
+ * Get pointer to the first property of the node, it is used to iterate
+ * and read all the property with of_get_next_property_by_prop().
+ *
+ * @np: Pointer to device node
+ * @return pointer to property or NULL if not found
+ */
+const struct property *of_get_first_property(const struct device_node *np);
+
+/**
+ * of_get_next_property() - get to the pointer of the next property
+ *
+ * Get pointer to the next property of the node, it is used to iterate
+ * and read all the property with of_get_property_by_prop().
+ *
+ * @np: Pointer to device node
+ * @property: pointer of the current property
+ * @return pointer to next property or NULL if not found
+ */
+const struct property *of_get_next_property(const struct device_node *np,
+ const struct property *property);
+
+/**
+ * of_get_property_by_prop() - get a property value of a node property
+ *
+ * Get value for the property identified by node and property pointer.
+ *
+ * @node: node to read
+ * @property: pointer of the property to read
+ * @propname: place to property name on success
+ * @lenp: place to put length on success
+ * @return pointer to property value or NULL if error
+ */
+const void *of_get_property_by_prop(const struct device_node *np,
+ const struct property *property,
+ const char **name,
+ int *lenp);
+
+/**
* of_device_is_compatible() - Check if the node matches given constraints
* @device: pointer to node
* @compat: required compatible string, NULL or "" for any match
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index ce5e366..618fc10 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -59,6 +59,31 @@
};
/**
+ * ofprop - reference to a property of a device tree node
+ *
+ * This struct hold the reference on one property of one node,
+ * using struct ofnode and an offset within the flat device tree or either
+ * a pointer to a struct property in the live device tree.
+ *
+ * Thus we can reference arguments in both the live tree and the flat tree.
+ *
+ * The property reference can also hold a null reference. This corresponds to
+ * a struct property NULL pointer or an offset of -1.
+ *
+ * @node: Pointer to device node
+ * @offset: Pointer into flat device tree, used for flat tree.
+ * @prop: Pointer to property, used for live treee.
+ */
+
+struct ofprop {
+ ofnode node;
+ union {
+ int offset;
+ const struct property *prop;
+ };
+};
+
+/**
* _ofnode_to_np() - convert an ofnode to a live DT node pointer
*
* This cannot be called if the reference contains an offset.
@@ -595,7 +620,7 @@
struct display_timing *config);
/**
- * ofnode_get_property()- - get a pointer to the value of a node property
+ * ofnode_get_property() - get a pointer to the value of a node property
*
* @node: node to read
* @propname: property to read
@@ -605,6 +630,42 @@
const void *ofnode_get_property(ofnode node, const char *propname, int *lenp);
/**
+ * ofnode_get_first_property()- get the reference of the first property
+ *
+ * Get reference to the first property of the node, it is used to iterate
+ * and read all the property with ofnode_get_property_by_prop().
+ *
+ * @node: node to read
+ * @prop: place to put argument reference
+ * @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
+ */
+int ofnode_get_first_property(ofnode node, struct ofprop *prop);
+
+/**
+ * ofnode_get_next_property() - get the reference of the next property
+ *
+ * Get reference to the next property of the node, it is used to iterate
+ * and read all the property with ofnode_get_property_by_prop().
+ *
+ * @prop: reference of current argument and place to put reference of next one
+ * @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
+ */
+int ofnode_get_next_property(struct ofprop *prop);
+
+/**
+ * ofnode_get_property_by_prop() - get a pointer to the value of a property
+ *
+ * Get value for the property identified by the provided reference.
+ *
+ * @prop: reference on property
+ * @propname: If non-NULL, place to property name on success,
+ * @lenp: If non-NULL, place to put length on success
+ * @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
+ */
+const void *ofnode_get_property_by_prop(const struct ofprop *prop,
+ const char **propname, int *lenp);
+
+/**
* ofnode_is_available() - check if a node is marked available
*
* @node: node to check
diff --git a/include/dm/read.h b/include/dm/read.h
index 77d3bc8..03c15b8 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -495,6 +495,42 @@
int *lenp);
/**
+ * dev_read_first_prop()- get the reference of the first property
+ *
+ * Get reference to the first property of the node, it is used to iterate
+ * and read all the property with dev_read_prop_by_prop().
+ *
+ * @dev: device to check
+ * @prop: place to put argument reference
+ * @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
+ */
+int dev_read_first_prop(const struct udevice *dev, struct ofprop *prop);
+
+/**
+ * ofnode_get_next_property() - get the reference of the next property
+ *
+ * Get reference to the next property of the node, it is used to iterate
+ * and read all the property with dev_read_prop_by_prop().
+ *
+ * @prop: reference of current argument and place to put reference of next one
+ * @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
+ */
+int dev_read_next_prop(struct ofprop *prop);
+
+/**
+ * dev_read_prop_by_prop() - get a pointer to the value of a property
+ *
+ * Get value for the property identified by the provided reference.
+ *
+ * @prop: reference on property
+ * @propname: If non-NULL, place to property name on success,
+ * @lenp: If non-NULL, place to put length on success
+ * @return 0 if OK, -ve on error. -FDT_ERR_NOTFOUND if not found
+ */
+const void *dev_read_prop_by_prop(struct ofprop *prop,
+ const char **propname, int *lenp);
+
+/**
* dev_read_alias_seq() - Get the alias sequence number of a node
*
* This works out whether a node is pointed to by an alias, and if so, the
@@ -860,6 +896,23 @@
return ofnode_get_property(dev_ofnode(dev), propname, lenp);
}
+static inline int dev_read_first_prop(const struct udevice *dev, struct ofprop *prop)
+{
+ return ofnode_get_first_property(dev_ofnode(dev), prop);
+}
+
+static inline int dev_read_next_prop(struct ofprop *prop)
+{
+ return ofnode_get_next_property(prop);
+}
+
+static inline const void *dev_read_prop_by_prop(struct ofprop *prop,
+ const char **propname,
+ int *lenp)
+{
+ return ofnode_get_property_by_prop(prop, propname, lenp);
+}
+
static inline int dev_read_alias_seq(const struct udevice *dev, int *devnump)
{
return fdtdec_get_alias_seq(gd->fdt_blob, dev->uclass->uc_drv->name,
@@ -941,4 +994,18 @@
ofnode_valid(subnode); \
subnode = ofnode_next_subnode(subnode))
+/**
+ * dev_for_each_property() - Helper function to iterate through property
+ *
+ * This creates a for() loop which works through the property in a device's
+ * device-tree node.
+ *
+ * @prop: struct ofprop holding the current property
+ * @dev: device to use for interation (struct udevice *)
+ */
+#define dev_for_each_property(prop, dev) \
+ for (int ret_prop = dev_read_first_prop(dev, &prop); \
+ !ret_prop; \
+ ret_prop = dev_read_next_prop(&prop))
+
#endif