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dm: core: add ofnode and dev function to iterate on node property

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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>
This commit is contained in:
Patrick Delaunay 2020-01-13 11:34:56 +01:00 • committed by Tom Rini
parent 719cab6d2e
commit ce891fcada
8 changed files with 317 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

63
include/dm/ofnode.h
View file

@ -58,6 +58,31 @@ struct ofnode_phandle_args {
uint32_t args[OF_MAX_PHANDLE_ARGS];
};
/**
* 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
*
@ -595,7 +620,7 @@ int ofnode_decode_display_timing(ofnode node, int index,
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
@ -604,6 +629,42 @@ int ofnode_decode_display_timing(ofnode node, int index,
*/
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
*