| .. _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>; |
| }; |