1*4882a593SmuzhiyunExternal Memory Interface 2*4882a593Smuzhiyun------------------------- 3*4882a593Smuzhiyun 4*4882a593SmuzhiyunThe emifa node describes a simple external bus controller found on some C6X 5*4882a593SmuzhiyunSoCs. This interface provides external busses with a number of chip selects. 6*4882a593Smuzhiyun 7*4882a593SmuzhiyunRequired properties: 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun- compatible: must be "ti,c64x+emifa", "simple-bus" 10*4882a593Smuzhiyun- reg: register area base and size 11*4882a593Smuzhiyun- #address-cells: must be 2 (chip-select + offset) 12*4882a593Smuzhiyun- #size-cells: must be 1 13*4882a593Smuzhiyun- ranges: mapping from EMIFA space to parent space 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun 16*4882a593SmuzhiyunOptional properties: 17*4882a593Smuzhiyun 18*4882a593Smuzhiyun- ti,dscr-dev-enable: Device ID if EMIF is enabled/disabled from DSCR 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun- ti,emifa-burst-priority: 21*4882a593Smuzhiyun Number of memory transfers after which the EMIF will elevate the priority 22*4882a593Smuzhiyun of the oldest command in the command FIFO. Setting this field to 255 23*4882a593Smuzhiyun disables this feature, thereby allowing old commands to stay in the FIFO 24*4882a593Smuzhiyun indefinitely. 25*4882a593Smuzhiyun 26*4882a593Smuzhiyun- ti,emifa-ce-config: 27*4882a593Smuzhiyun Configuration values for each of the supported chip selects. 28*4882a593Smuzhiyun 29*4882a593SmuzhiyunExample: 30*4882a593Smuzhiyun 31*4882a593Smuzhiyun emifa@70000000 { 32*4882a593Smuzhiyun compatible = "ti,c64x+emifa", "simple-bus"; 33*4882a593Smuzhiyun #address-cells = <2>; 34*4882a593Smuzhiyun #size-cells = <1>; 35*4882a593Smuzhiyun reg = <0x70000000 0x100>; 36*4882a593Smuzhiyun ranges = <0x2 0x0 0xa0000000 0x00000008 37*4882a593Smuzhiyun 0x3 0x0 0xb0000000 0x00400000 38*4882a593Smuzhiyun 0x4 0x0 0xc0000000 0x10000000 39*4882a593Smuzhiyun 0x5 0x0 0xD0000000 0x10000000>; 40*4882a593Smuzhiyun 41*4882a593Smuzhiyun ti,dscr-dev-enable = <13>; 42*4882a593Smuzhiyun ti,emifa-burst-priority = <255>; 43*4882a593Smuzhiyun ti,emifa-ce-config = <0x00240120 44*4882a593Smuzhiyun 0x00240120 45*4882a593Smuzhiyun 0x00240122 46*4882a593Smuzhiyun 0x00240122>; 47*4882a593Smuzhiyun 48*4882a593Smuzhiyun flash@3,0 { 49*4882a593Smuzhiyun #address-cells = <1>; 50*4882a593Smuzhiyun #size-cells = <1>; 51*4882a593Smuzhiyun compatible = "cfi-flash"; 52*4882a593Smuzhiyun reg = <0x3 0x0 0x400000>; 53*4882a593Smuzhiyun bank-width = <1>; 54*4882a593Smuzhiyun device-width = <1>; 55*4882a593Smuzhiyun partition@0 { 56*4882a593Smuzhiyun reg = <0x0 0x400000>; 57*4882a593Smuzhiyun label = "NOR"; 58*4882a593Smuzhiyun }; 59*4882a593Smuzhiyun }; 60*4882a593Smuzhiyun }; 61*4882a593Smuzhiyun 62*4882a593SmuzhiyunThis shows a flash chip attached to chip select 3. 63