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.. _device-tree/ibm,opal/flash:
ibm,opal/flash device tree entries
==================================
The flash@<n> nodes under ibm,opal describe flash devices that can be
accessed through the OPAL_FLASH_{READ,ERASE,WRITE} interface.
These interfaces take an 'id' parameter, which corresponds to the ibm,opal-id
property of the node.
The properties under a flash node are:
- ``compatible = "ibm,opal-flash"``
``ibm,opal-id = <id>``
provides the index used for the OPAL_FLASH_XXX calls to reference this
flash device
``reg = <0 size>``
the offset and size of the flash device
``ibm,flash-block-size``
the read/write/erase block size for the flash interface. Calls
to read/write/erase must be aligned to the block size.
``#address-cells = <1>``, ``#size-cells = <1>``
flash devices are currently 32-bit addressable
If valid partitions are found on the flash device, then ``partition@<offset>``
sub-nodes are added to the flash node. These match the Linux binding for
flash partitions; the reg parameter contains the offset and size of the
partition.
Example:
.. code-block:: dts
flash@0 {
reg = <0x0 0x4000000>;
compatible = "ibm,opal-flash";
ibm,opal-id = <0x0>;
ibm,flash-block-size = <0x1000>;
#address-cells = <0x1>;
phandle = <0x100002bf>;
#size-cells = <0x1>;
};
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