Based on kernel version 5.15
. Page generated on 2021-11-01 09:19 EST
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | Device Tree Bindings for Register Bit LEDs Register bit leds are used with syscon multifunctional devices where single bits in a certain register can turn on/off a single LED. The register bit LEDs appear as children to the syscon device, with the proper compatible string. For the syscon bindings see: Documentation/devicetree/bindings/mfd/syscon.yaml Each LED is represented as a sub-node of the syscon device. Each node's name represents the name of the corresponding LED. LED sub-node properties: Required properties: - compatible : must be "register-bit-led" - offset : register offset to the register controlling this LED - mask : bit mask for the bit controlling this LED in the register typically 0x01, 0x02, 0x04 ... Optional properties: - label : (optional) see Documentation/devicetree/bindings/leds/common.txt - linux,default-trigger : (optional) see Documentation/devicetree/bindings/leds/common.txt - default-state: (optional) The initial state of the LED see Documentation/devicetree/bindings/leds/common.txt Example: syscon: syscon@10000000 { compatible = "arm,realview-pb1176-syscon", "syscon"; reg = <0x10000000 0x1000>; led@8.0 { compatible = "register-bit-led"; offset = <0x08>; mask = <0x01>; label = "versatile:0"; linux,default-trigger = "heartbeat"; default-state = "on"; }; led@8.1 { compatible = "register-bit-led"; offset = <0x08>; mask = <0x02>; label = "versatile:1"; linux,default-trigger = "mmc0"; default-state = "off"; }; led@8.2 { compatible = "register-bit-led"; offset = <0x08>; mask = <0x04>; label = "versatile:2"; linux,default-trigger = "cpu0"; default-state = "off"; }; led@8.3 { compatible = "register-bit-led"; offset = <0x08>; mask = <0x08>; label = "versatile:3"; default-state = "off"; }; led@8.4 { compatible = "register-bit-led"; offset = <0x08>; mask = <0x10>; label = "versatile:4"; default-state = "off"; }; led@8.5 { compatible = "register-bit-led"; offset = <0x08>; mask = <0x20>; label = "versatile:5"; default-state = "off"; }; led@8.6 { compatible = "register-bit-led"; offset = <0x08>; mask = <0x40>; label = "versatile:6"; default-state = "off"; }; led@8.7 { compatible = "register-bit-led"; offset = <0x08>; mask = <0x80>; label = "versatile:7"; default-state = "off"; }; }; |