Devicetree NVMEM API

Macros
#define	DT_NVMEM_CELLS_HAS_IDX(node_id, idx)
	Test if a node has an nvmem-cells phandle-array property at a given index.
#define	DT_NVMEM_CELLS_HAS_NAME(node_id, name)
	Test if a node has an nvmem-cell-names array property hold a given name.
#define	DT_NUM_NVMEM_CELLS(node_id)
	Get the number of elements in an nvmem-cells property.
#define	DT_NVMEM_CELL_BY_IDX(node_id, idx)
	Get the node identifier for the NVMEM cell from the nvmem-cells property by index.
#define	DT_NVMEM_CELL(node_id)
	Equivalent to DT_NVMEM_CELL_BY_IDX(node_id, 0)
#define	DT_NVMEM_CELL_BY_NAME(node_id, name)
	Get the node identifier for the NVMEM cell from the nvmem-cells property by name.
#define	DT_INST_NVMEM_CELLS_HAS_IDX(inst, idx)
	Equivalent to DT_NVMEM_CELLS_HAS_IDX(DT_DRV_INST(inst), idx)
#define	DT_INST_NVMEM_CELLS_HAS_NAME(inst, name)
	Equivalent to DT_NVMEM_CELLS_HAS_NAME(DT_DRV_INST(inst), name)
#define	DT_INST_NUM_NVMEM_CELLS(inst)
	Equivalent to DT_NUM_NVMEM_CELLS(DT_DRV_INST(inst))
#define	DT_INST_NVMEM_CELL_BY_IDX(inst, idx)
	Get the node identifier for the controller phandle from an nvmem-cells phandle-array property at an index.
#define	DT_INST_NVMEM_CELL(inst)
	Equivalent to DT_INST_NVMEM_CELL_BY_IDX(inst, 0)
#define	DT_INST_NVMEM_CELL_BY_NAME(inst, name)
	Get the node identifier for the controller phandle from an nvmem-cells phandle-array property by name.
#define	DT_MTD_FROM_NVMEM_CELL(node_id)
	Get the node identifier of the memory controller for an nvmem cell.

Detailed Description

Macro Definition Documentation

DT_INST_NUM_NVMEM_CELLS

#define DT_INST_NUM_NVMEM_CELLS

(

inst

)

#include <zephyr/devicetree/nvmem.h>

Value:

DT_NUM_NVMEM_CELLS(DT_DRV_INST(inst))

Equivalent to DT_NUM_NVMEM_CELLS(DT_DRV_INST(inst))

Parameters

inst	instance number

Returns

number of elements in the nvmem-cells property

DT_INST_NVMEM_CELL

#define DT_INST_NVMEM_CELL

(

inst

)

#include <zephyr/devicetree/nvmem.h>

Value:

DT_INST_NVMEM_CELL_BY_IDX(inst, 0)

Equivalent to DT_INST_NVMEM_CELL_BY_IDX(inst, 0)

Parameters

inst	instance number

Returns

a node identifier for the nvmem cell at index 0 in nvmem-cells

See also

DT_NVMEM_CELL()

DT_INST_NVMEM_CELL_BY_IDX

#define DT_INST_NVMEM_CELL_BY_IDX	(		inst,
			idx )

#include <zephyr/devicetree/nvmem.h>

Value:

DT_NVMEM_CELL_BY_IDX(DT_DRV_INST(inst), idx)

Get the node identifier for the controller phandle from an nvmem-cells phandle-array property at an index.

Parameters

inst	instance number
idx	logical index into nvmem-cells

Returns

the node identifier for the nvmem cell referenced at index "idx"

See also

DT_NVMEM_CELL_CTLR_BY_IDX()

DT_INST_NVMEM_CELL_BY_NAME

#define DT_INST_NVMEM_CELL_BY_NAME	(		inst,
			name )

#include <zephyr/devicetree/nvmem.h>

Value:

DT_NVMEM_CELL_BY_NAME(DT_DRV_INST(inst), name)

Get the node identifier for the controller phandle from an nvmem-cells phandle-array property by name.

Parameters

inst	instance number
name	lowercase-and-underscores name of an nvmem-cells element as defined by the node's nvmem-cell-names property

Returns

the node identifier for the nvmem cell referenced by the named element

See also

DT_NVMEM_CELL_BY_NAME()

DT_INST_NVMEM_CELLS_HAS_IDX

#define DT_INST_NVMEM_CELLS_HAS_IDX	(		inst,
			idx )

#include <zephyr/devicetree/nvmem.h>

Value:

DT_NVMEM_CELLS_HAS_IDX(DT_DRV_INST(inst), idx)

Equivalent to DT_NVMEM_CELLS_HAS_IDX(DT_DRV_INST(inst), idx)

Parameters

inst	DT_DRV_COMPAT instance number; may or may not have any nvmem-cells property
idx	index of an nvmem-cells property phandle-array whose existence to check

Returns

1 if the index exists, 0 otherwise

DT_INST_NVMEM_CELLS_HAS_NAME

#define DT_INST_NVMEM_CELLS_HAS_NAME	(		inst,
			name )

#include <zephyr/devicetree/nvmem.h>

Value:

DT_NVMEM_CELLS_HAS_NAME(DT_DRV_INST(inst), name)

Equivalent to DT_NVMEM_CELLS_HAS_NAME(DT_DRV_INST(inst), name)

Parameters

inst	DT_DRV_COMPAT instance number; may or may not have any nvmem-cell-names property.
name	lowercase-and-underscores nvmem-cell-names cell value name to check

Returns

1 if the nvmem cell name exists, 0 otherwise

DT_MTD_FROM_NVMEM_CELL

#define DT_MTD_FROM_NVMEM_CELL

(

node_id

)

#include <zephyr/devicetree/nvmem.h>

Value:

DT_GPARENT(node_id)

Get the node identifier of the memory controller for an nvmem cell.

Example devicetree fragment:

mac_eeprom: mac_eeprom@2 {
   nvmem-layout {
           compatible = "fixed-layout";
           #address-cells = <1>;
           #size-cells = <1>;
 
           mac_address: mac_address@fa {
                   reg = <0xfa 0x06>;
                   #nvmem-cell-cells = <0>;
           };
   };
};
 
eth: ethernet {
   nvmem-cells = <&mac_address>;
   nvmem-cell-names = "mac-address";
};

Example usage:

DT_MTD_FROM_NVMEM_CELL(DT_NVMEM_CELL(DT_NODELABEL(eth))) // DT_NODELABEL(mac_eeprom)

Parameters

node_id

node identifier for an nvmem cell node

Returns

the node identifier of the Memory Technology Device (MTD) that contains the nvmem cell node.

DT_NUM_NVMEM_CELLS

#define DT_NUM_NVMEM_CELLS

(

node_id

)

#include <zephyr/devicetree/nvmem.h>

Value:

DT_PROP_LEN(node_id, nvmem_cells)

Get the number of elements in an nvmem-cells property.

Example devicetree fragment:

eth: ethernet {
   nvmem-cells = <&mac_address>;
   nvmem-cell-names = "mac-address";
};

Example usage:

DT_NUM_NVMEM_CELLS(DT_NODELABEL(eth)) // 1

Parameters

node_id

node identifier with an nvmem-cells property

Returns

number of elements in the property

DT_NVMEM_CELL

#define DT_NVMEM_CELL

(

node_id

)

#include <zephyr/devicetree/nvmem.h>

Value:

DT_NVMEM_CELL_BY_IDX(node_id, 0)

Equivalent to DT_NVMEM_CELL_BY_IDX(node_id, 0)

Parameters

node_id

node identifier

Returns

a node identifier for the NVMEM cell at index 0 in "nvmem-cells"

See also

DT_NVMEM_CELL_BY_IDX()

DT_NVMEM_CELL_BY_IDX

#define DT_NVMEM_CELL_BY_IDX	(		node_id,
			idx )

#include <zephyr/devicetree/nvmem.h>

Value:

DT_PHANDLE_BY_IDX(node_id, nvmem_cells, idx)

Get the node identifier for the NVMEM cell from the nvmem-cells property by index.

Example devicetree fragment:

mac_eeprom: mac_eeprom@2 {
   nvmem-layout {
           compatible = "fixed-layout";
           #address-cells = <1>;
           #size-cells = <1>;
 
           mac_address: mac_address@fa {
                   reg = <0xfa 0x06>;
                   #nvmem-cell-cells = <0>;
           };
   };
};
 
eth: ethernet {
   nvmem-cells = <&mac_address>;
   nvmem-cell-names = "mac-address";
};

Example usage:

DT_NVMEM_CELL_BY_IDX(DT_NODELABEL(eth), 0) // DT_NODELABEL(mac_address)

Parameters

node_id	node identifier for a node with a nvmem-cells property
idx	index into the nvmem-cells property

Returns

the node identifier for the NVMEM cell at index idx

DT_NVMEM_CELL_BY_NAME

#define DT_NVMEM_CELL_BY_NAME	(		node_id,
			name )

#include <zephyr/devicetree/nvmem.h>

Value:

DT_PHANDLE_BY_NAME(node_id, nvmem_cells, name)

Get the node identifier for the NVMEM cell from the nvmem-cells property by name.

Example devicetree fragment:

mac_eeprom: mac_eeprom@2 {
   nvmem-layout {
           compatible = "fixed-layout";
           #address-cells = <1>;
           #size-cells = <1>;
 
           mac_address: mac_address@fa {
                   reg = <0xfa 0x06>;
                   #nvmem-cell-cells = <0>;
           };
   };
};
 
eth: ethernet {
   nvmem-cells = <&mac_address>;
   nvmem-cell-names = "mac-address";
};

Example usage:

DT_NVMEM_CELL_BY_NAME(DT_NODELABEL(eth), mac_address) // DT_NODELABEL(mac_address)

Parameters

node_id	node identifier for a node with a nvmem-cells property
name	lowercase-and-underscores name of an nvmem-cells element as defined by the node's nvmem-cell-names property

Returns

the node identifier for the NVMEM cell by name

DT_NVMEM_CELLS_HAS_IDX

#define DT_NVMEM_CELLS_HAS_IDX	(		node_id,
			idx )

#include <zephyr/devicetree/nvmem.h>

Value:

DT_PROP_HAS_IDX(node_id, nvmem_cells, idx)

Test if a node has an nvmem-cells phandle-array property at a given index.

This expands to 1 if the given index is a valid nvmem-cells property phandle-array index. Otherwise, it expands to 0.

Example devicetree fragment:

eth: ethernet {
   nvmem-cells = <&mac_address>;
   nvmem-cell-names = "mac-address";
};

Example usage:

DT_NVMEM_CELLS_HAS_IDX(DT_NODELABEL(eth), 0) // 1
DT_NVMEM_CELLS_HAS_IDX(DT_NODELABEL(eth), 1) // 0

Parameters

node_id	node identifier; may or may not have any nvmem-cells property
idx	index of a nvmem-cells property phandle-array whose existence to check

Returns

1 if the index exists, 0 otherwise

DT_NVMEM_CELLS_HAS_NAME

#define DT_NVMEM_CELLS_HAS_NAME	(		node_id,
			name )

#include <zephyr/devicetree/nvmem.h>

Value:

DT_PROP_HAS_NAME(node_id, nvmem_cells, name)

Test if a node has an nvmem-cell-names array property hold a given name.

This expands to 1 if the name is available as nvmem-cells-name array property cell. Otherwise, it expands to 0.

Example devicetree fragment:

eth: ethernet {
   nvmem-cells = <&mac_address>;
   nvmem-cell-names = "mac-address";
};

Example usage:

DT_NVMEM_CELLS_HAS_NAME(DT_NODELABEL(eth), mac_address) // 1
DT_NVMEM_CELLS_HAS_NAME(DT_NODELABEL(eth), bogus)       // 0

Parameters

node_id	node identifier; may or may not have any nvmem-cell-names property
name	lowercase-and-underscores nvmem-cell-names cell value name to check

Returns

1 if the index exists, 0 otherwise