Based on kernel version 4.3. Page generated on 2015-11-02 12:47 EST.
1 Allwinnner SoC SRAM controllers 2 ----------------------------------------------------- 3 4 The SRAM controller found on most Allwinner devices is represented by 5 a regular node for the SRAM controller itself, with sub-nodes 6 reprensenting the SRAM handled by the SRAM controller. 7 8 Controller Node 9 --------------- 10 11 Required properties: 12 - compatible : "allwinner,sun4i-a10-sram-controller" 13 - reg : sram controller register offset + length 14 15 SRAM nodes 16 ---------- 17 18 Each SRAM is described using the mmio-sram bindings documented in 19 Documentation/devicetree/bindings/misc/sram.txt 20 21 Each SRAM will have SRAM sections that are going to be handled by the 22 SRAM controller as subnodes. These sections are represented following 23 once again the representation described in the mmio-sram binding. 24 25 The valid sections compatible are: 26 - allwinner,sun4i-a10-sram-a3-a4 27 - allwinner,sun4i-a10-sram-d 28 29 Devices using SRAM sections 30 --------------------------- 31 32 Some devices need to request to the SRAM controller to map an SRAM for 33 their exclusive use. 34 35 The relationship between such a device and an SRAM section is 36 expressed through the allwinner,sram property, that will take a 37 phandle and an argument. 38 39 This valid values for this argument are: 40 - 0: CPU 41 - 1: Device 42 43 Example 44 ------- 45 sram-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 67 emac: ethernet@01c0b000 { 68 compatible = "allwinner,sun4i-a10-emac"; 69 ... 70 71 allwinner,sram = <&emac_sram 1>; 72 };