1Generic on-chip SRAM 2 3Simple IO memory regions to be managed by the genalloc API. 4 5Required properties: 6 7- compatible : mmio-sram 8 9- reg : SRAM iomem address range 10 11Reserving sram areas: 12--------------------- 13 14Each child of the sram node specifies a region of reserved memory. Each 15child node should use a 'reg' property to specify a specific range of 16reserved memory. 17 18Following the generic-names recommended practice, node names should 19reflect the purpose of the node. Unit address (@<address>) should be 20appended to the name. 21 22Required properties in the sram node: 23 24- #address-cells, #size-cells : should use the same values as the root node 25- ranges : standard definition, should translate from local addresses 26 within the sram to bus addresses 27 28Required properties in the area nodes: 29 30- reg : iomem address range, relative to the SRAM range 31 32Optional properties in the area nodes: 33 34- compatible : standard definition, should contain a vendor specific string 35 in the form <vendor>,[<device>-]<usage> 36- pool : indicates that the particular reserved SRAM area is addressable 37 and in use by another device or devices 38- export : indicates that the reserved SRAM area may be accessed outside 39 of the kernel, e.g. by bootloader or userspace 40- label : the name for the reserved partition, if omitted, the label 41 is taken from the node name excluding the unit address. 42 43Example: 44 45sram: sram@5c000000 { 46 compatible = "mmio-sram"; 47 reg = <0x5c000000 0x40000>; /* 256 KiB SRAM at address 0x5c000000 */ 48 49 #adress-cells = <1>; 50 #size-cells = <1>; 51 ranges = <0 0x5c000000 0x40000>; 52 53 smp-sram@100 { 54 compatible = "socvendor,smp-sram"; 55 reg = <0x100 0x50>; 56 }; 57 58 device-sram@1000 { 59 reg = <0x1000 0x1000>; 60 pool; 61 }; 62 63 exported@20000 { 64 reg = <0x20000 0x20000>; 65 export; 66 }; 67}; 68