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