Based on kernel version 4.0. Page generated on 2015-04-14 21:20 EST.
1 ARM Broadcom STB platforms Device Tree Bindings 2 ----------------------------------------------- 3 Boards with Broadcom Brahma15 ARM-based BCMxxxx (generally BCM7xxx variants) 4 SoC shall have the following DT organization: 5 6 Required root node properties: 7 - compatible: "brcm,bcm<chip_id>", "brcm,brcmstb" 8 9 example: 10 / { 11 #address-cells = <2>; 12 #size-cells = <2>; 13 model = "Broadcom STB (bcm7445)"; 14 compatible = "brcm,bcm7445", "brcm,brcmstb"; 15 16 Further, syscon nodes that map platform-specific registers used for general 17 system control is required: 18 19 - compatible: "brcm,bcm<chip_id>-sun-top-ctrl", "syscon" 20 - compatible: "brcm,bcm<chip_id>-hif-cpubiuctrl", "syscon" 21 - compatible: "brcm,bcm<chip_id>-hif-continuation", "syscon" 22 23 example: 24 rdb { 25 #address-cells = <1>; 26 #size-cells = <1>; 27 compatible = "simple-bus"; 28 ranges = <0 0x00 0xf0000000 0x1000000>; 29 30 sun_top_ctrl: syscon@404000 { 31 compatible = "brcm,bcm7445-sun-top-ctrl", "syscon"; 32 reg = <0x404000 0x51c>; 33 }; 34 35 hif_cpubiuctrl: syscon@3e2400 { 36 compatible = "brcm,bcm7445-hif-cpubiuctrl", "syscon"; 37 reg = <0x3e2400 0x5b4>; 38 }; 39 40 hif_continuation: syscon@452000 { 41 compatible = "brcm,bcm7445-hif-continuation", "syscon"; 42 reg = <0x452000 0x100>; 43 }; 44 }; 45 46 Lastly, nodes that allow for support of SMP initialization and reboot are 47 required: 48 49 smpboot 50 ------- 51 Required properties: 52 53 - compatible 54 The string "brcm,brcmstb-smpboot". 55 56 - syscon-cpu 57 A phandle / integer array property which lets the BSP know the location 58 of certain CPU power-on registers. 59 60 The layout of the property is as follows: 61 o a phandle to the "hif_cpubiuctrl" syscon node 62 o offset to the base CPU power zone register 63 o offset to the base CPU reset register 64 65 - syscon-cont 66 A phandle pointing to the syscon node which describes the CPU boot 67 continuation registers. 68 o a phandle to the "hif_continuation" syscon node 69 70 example: 71 smpboot { 72 compatible = "brcm,brcmstb-smpboot"; 73 syscon-cpu = <&hif_cpubiuctrl 0x88 0x178>; 74 syscon-cont = <&hif_continuation>; 75 }; 76 77 reboot 78 ------- 79 Required properties 80 81 - compatible 82 The string property "brcm,brcmstb-reboot" for 40nm/28nm chips with 83 the new SYS_CTRL interface, or "brcm,bcm7038-reboot" for 65nm 84 chips with the old SUN_TOP_CTRL interface. 85 86 - syscon 87 A phandle / integer array that points to the syscon node which describes 88 the general system reset registers. 89 o a phandle to "sun_top_ctrl" 90 o offset to the "reset source enable" register 91 o offset to the "software master reset" register 92 93 example: 94 reboot { 95 compatible = "brcm,brcmstb-reboot"; 96 syscon = <&sun_top_ctrl 0x304 0x308>; 97 };