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-External Memory Interface
--------------------------
-
-The emifa node describes a simple external bus controller found on some C6X
-SoCs. This interface provides external busses with a number of chip selects.
-
-Required properties:
-
-- compatible: must be "ti,c64x+emifa", "simple-bus"
-- reg: register area base and size
-- #address-cells: must be 2 (chip-select + offset)
-- #size-cells: must be 1
-- ranges: mapping from EMIFA space to parent space
-
-
-Optional properties:
-
-- ti,dscr-dev-enable: Device ID if EMIF is enabled/disabled from DSCR
-
-- ti,emifa-burst-priority:
- Number of memory transfers after which the EMIF will elevate the priority
- of the oldest command in the command FIFO. Setting this field to 255
- disables this feature, thereby allowing old commands to stay in the FIFO
- indefinitely.
-
-- ti,emifa-ce-config:
- Configuration values for each of the supported chip selects.
-
-Example:
-
- emifa@70000000 {
- compatible = "ti,c64x+emifa", "simple-bus";
- #address-cells = <2>;
- #size-cells = <1>;
- reg = <0x70000000 0x100>;
- ranges = <0x2 0x0 0xa0000000 0x00000008
- 0x3 0x0 0xb0000000 0x00400000
- 0x4 0x0 0xc0000000 0x10000000
- 0x5 0x0 0xD0000000 0x10000000>;
-
- ti,dscr-dev-enable = <13>;
- ti,emifa-burst-priority = <255>;
- ti,emifa-ce-config = <0x00240120
- 0x00240120
- 0x00240122
- 0x00240122>;
-
- flash@3,0 {
- #address-cells = <1>;
- #size-cells = <1>;
- compatible = "cfi-flash";
- reg = <0x3 0x0 0x400000>;
- bank-width = <1>;
- device-width = <1>;
- partition@0 {
- reg = <0x0 0x400000>;
- label = "NOR";
- };
- };
- };
-
-This shows a flash chip attached to chip select 3.