Dependency tracking

Macros
#define	DT_DEP_ORD(node_id)   DT_CAT(node_id, _ORD)
	Get a node's dependency ordinal. More...
#define	DT_REQUIRES_DEP_ORDS(node_id)   DT_CAT(node_id, _REQUIRES_ORDS)
	Get a list of dependency ordinals of a node's direct dependencies. More...
#define	DT_SUPPORTS_DEP_ORDS(node_id)   DT_CAT(node_id, _SUPPORTS_ORDS)
	Get a list of dependency ordinals of what depends directly on a node. More...
#define	DT_INST_DEP_ORD(inst)   DT_DEP_ORD(DT_DRV_INST(inst))
	Get a DT_DRV_COMPAT instance's dependency ordinal. More...
#define	DT_INST_REQUIRES_DEP_ORDS(inst)   DT_REQUIRES_DEP_ORDS(DT_DRV_INST(inst))
	Get a list of dependency ordinals of a DT_DRV_COMPAT instance's direct dependencies. More...
#define	DT_INST_SUPPORTS_DEP_ORDS(inst)   DT_SUPPORTS_DEP_ORDS(DT_DRV_INST(inst))
	Get a list of dependency ordinals of what depends directly on a DT_DRV_COMPAT instance. More...

Detailed Description

Macro Definition Documentation

DT_DEP_ORD

#define DT_DEP_ORD

(

node_id

)

DT_CAT(node_id, _ORD)

#include <include/devicetree/ordinals.h>

Get a node's dependency ordinal.

Parameters

node_id

Node identifier

Returns

the node's dependency ordinal as an integer literal

DT_INST_DEP_ORD

#define DT_INST_DEP_ORD

(

inst

)

DT_DEP_ORD(DT_DRV_INST(inst))

#include <include/devicetree/ordinals.h>

Get a DT_DRV_COMPAT instance's dependency ordinal.

Equivalent to DT_DEP_ORD(DT_DRV_INST(inst)).

Parameters

inst	instance number

Returns

The instance's dependency ordinal

DT_INST_REQUIRES_DEP_ORDS

#define DT_INST_REQUIRES_DEP_ORDS

(

inst

)

DT_REQUIRES_DEP_ORDS(DT_DRV_INST(inst))

#include <include/devicetree/ordinals.h>

Get a list of dependency ordinals of a DT_DRV_COMPAT instance's direct dependencies.

Equivalent to DT_REQUIRES_DEP_ORDS(DT_DRV_INST(inst)).

Parameters

inst	instance number

Returns

a list of dependency ordinals for the nodes the instance depends on directly

DT_INST_SUPPORTS_DEP_ORDS

#define DT_INST_SUPPORTS_DEP_ORDS

(

inst

)

DT_SUPPORTS_DEP_ORDS(DT_DRV_INST(inst))

#include <include/devicetree/ordinals.h>

Get a list of dependency ordinals of what depends directly on a DT_DRV_COMPAT instance.

Equivalent to DT_SUPPORTS_DEP_ORDS(DT_DRV_INST(inst)).

Parameters

inst	instance number

Returns

a list of node identifiers for the nodes that depend directly on the instance

DT_REQUIRES_DEP_ORDS

#define DT_REQUIRES_DEP_ORDS

(

node_id

)

DT_CAT(node_id, _REQUIRES_ORDS)

#include <include/devicetree/ordinals.h>

Get a list of dependency ordinals of a node's direct dependencies.

There is a comma after each ordinal in the expansion, including the last one:

DT_REQUIRES_DEP_ORDS(my_node) // required_ord_1, ..., required_ord_n,

The one case DT_REQUIRES_DEP_ORDS() expands to nothing is when given the root node identifier DT_ROOT as argument. The root has no direct dependencies; every other node at least depends on its parent.

Parameters

node_id

Node identifier

Returns

a list of dependency ordinals, with each ordinal followed by a comma (,), or an empty expansion

DT_SUPPORTS_DEP_ORDS

#define DT_SUPPORTS_DEP_ORDS

(

node_id

)

DT_CAT(node_id, _SUPPORTS_ORDS)

#include <include/devicetree/ordinals.h>

Get a list of dependency ordinals of what depends directly on a node.

There is a comma after each ordinal in the expansion, including the last one:

DT_SUPPORTS_DEP_ORDS(my_node) // supported_ord_1, ..., supported_ord_n,

DT_SUPPORTS_DEP_ORDS() may expand to nothing. This happens when node_id refers to a leaf node that nothing else depends on.

Parameters

node_id

Node identifier

Returns

a list of dependency ordinals, with each ordinal followed by a comma (,), or an empty expansion