1Allwinnner SoC SRAM controllers 2----------------------------------------------------- 3 4The SRAM controller found on most Allwinner devices is represented by 5a regular node for the SRAM controller itself, with sub-nodes 6reprensenting the SRAM handled by the SRAM controller. 7 8Controller Node 9--------------- 10 11Required properties: 12- compatible : "allwinner,sun4i-a10-sram-controller" 13- reg : sram controller register offset + length 14 15SRAM nodes 16---------- 17 18Each SRAM is described using the mmio-sram bindings documented in 19Documentation/devicetree/bindings/misc/sram.txt 20 21Each SRAM will have SRAM sections that are going to be handled by the 22SRAM controller as subnodes. These sections are represented following 23once again the representation described in the mmio-sram binding. 24 25The valid sections compatible are: 26 - allwinner,sun4i-a10-sram-a3-a4 27 - allwinner,sun4i-a10-sram-d 28 29Devices using SRAM sections 30--------------------------- 31 32Some devices need to request to the SRAM controller to map an SRAM for 33their exclusive use. 34 35The relationship between such a device and an SRAM section is 36expressed through the allwinner,sram property, that will take a 37phandle and an argument. 38 39This valid values for this argument are: 40 - 0: CPU 41 - 1: Device 42 43Example 44------- 45sram-controller@01c00000 { 46 compatible = "allwinner,sun4i-a10-sram-controller"; 47 reg = <0x01c00000 0x30>; 48 #address-cells = <1>; 49 #size-cells = <1>; 50 ranges; 51 52 sram_a: sram@00000000 { 53 compatible = "mmio-sram"; 54 reg = <0x00000000 0xc000>; 55 #address-cells = <1>; 56 #size-cells = <1>; 57 ranges = <0 0x00000000 0xc000>; 58 59 emac_sram: sram-section@8000 { 60 compatible = "allwinner,sun4i-a10-sram-a3-a4"; 61 reg = <0x8000 0x4000>; 62 status = "disabled"; 63 }; 64 }; 65}; 66 67emac: ethernet@01c0b000 { 68 compatible = "allwinner,sun4i-a10-emac"; 69 ... 70 71 allwinner,sram = <&emac_sram 1>; 72}; 73