| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 1 | # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/leds/backlight/lp855x-backlight.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: Texas Instruments LP855X backlight controllers |
| 8 | |
| 9 | maintainers: |
| 10 | - Artur Weber <aweber.kernel@gmail.com> |
| 11 | |
| 12 | properties: |
| 13 | compatible: |
| 14 | enum: |
| 15 | - ti,lp8550 |
| 16 | - ti,lp8551 |
| 17 | - ti,lp8552 |
| 18 | - ti,lp8553 |
| 19 | - ti,lp8555 |
| 20 | - ti,lp8556 |
| 21 | - ti,lp8557 |
| 22 | |
| 23 | reg: |
| 24 | maxItems: 1 |
| 25 | |
| 26 | dev-ctrl: |
| 27 | $ref: /schemas/types.yaml#/definitions/uint8 |
| 28 | description: |
| 29 | Value of device control register. This is a device-specific value. |
| 30 | |
| 31 | bl-name: |
| 32 | $ref: /schemas/types.yaml#/definitions/string |
| 33 | description: Backlight device name. |
| 34 | |
| 35 | init-brt: |
| 36 | $ref: /schemas/types.yaml#/definitions/uint8 |
| 37 | description: Initial value of backlight brightness. |
| 38 | |
| 39 | power-supply: |
| 40 | description: Regulator which controls the 3V rail. |
| 41 | |
| 42 | enable-supply: |
| 43 | description: Regulator which controls the EN/VDDIO input. |
| 44 | |
| 45 | pwms: |
| 46 | maxItems: 1 |
| 47 | description: | |
| 48 | PWM channel to use for controlling the backlight; setting this |
| 49 | enables the PWM-based backlight control mode. |
| 50 | |
| 51 | pwm-names: true |
| 52 | |
| 53 | pwm-period: |
| 54 | $ref: /schemas/types.yaml#/definitions/uint32 |
| 55 | description: |
| 56 | PWM period value. Deprecated; set the period value in the pwms |
| 57 | property instead. |
| 58 | deprecated: true |
| 59 | |
| 60 | patternProperties: |
| 61 | "^rom-[0-9a-f]{2}h$": |
| 62 | type: object |
| 63 | description: Nodes containing the values of configuration registers. |
| 64 | additionalProperties: false |
| 65 | properties: |
| 66 | rom-addr: |
| 67 | $ref: /schemas/types.yaml#/definitions/uint8 |
| 68 | description: Register address of ROM area to be updated. |
| 69 | |
| 70 | rom-val: |
| 71 | $ref: /schemas/types.yaml#/definitions/uint8 |
| 72 | description: Value to write to the ROM register. |
| 73 | |
| 74 | required: |
| 75 | - compatible |
| 76 | - reg |
| 77 | - dev-ctrl |
| 78 | |
| 79 | unevaluatedProperties: false |
| 80 | |
| 81 | examples: |
| 82 | - | |
| 83 | i2c { |
| 84 | #address-cells = <1>; |
| 85 | #size-cells = <0>; |
| 86 | |
| 87 | backlight@2c { |
| 88 | compatible = "ti,lp8555"; |
| 89 | reg = <0x2c>; |
| 90 | |
| 91 | dev-ctrl = /bits/ 8 <0x00>; |
| 92 | |
| 93 | pwms = <&pwm 0 10000>; |
| 94 | pwm-names = "lp8555"; |
| 95 | |
| 96 | /* 4V OV, 4 output LED0 string enabled */ |
| 97 | rom-14h { |
| 98 | rom-addr = /bits/ 8 <0x14>; |
| 99 | rom-val = /bits/ 8 <0xcf>; |
| 100 | }; |
| 101 | |
| 102 | /* Heavy smoothing, 24ms ramp time step */ |
| 103 | rom-15h { |
| 104 | rom-addr = /bits/ 8 <0x15>; |
| 105 | rom-val = /bits/ 8 <0xc7>; |
| 106 | }; |
| 107 | |
| 108 | /* 4 output LED1 string enabled */ |
| 109 | rom-19h { |
| 110 | rom-addr = /bits/ 8 <0x19>; |
| 111 | rom-val = /bits/ 8 <0x0f>; |
| 112 | }; |
| 113 | }; |
| 114 | }; |
| 115 | - | |
| 116 | i2c { |
| 117 | #address-cells = <1>; |
| 118 | #size-cells = <0>; |
| 119 | |
| 120 | backlight@2c { |
| 121 | compatible = "ti,lp8556"; |
| 122 | reg = <0x2c>; |
| 123 | |
| 124 | bl-name = "lcd-bl"; |
| 125 | dev-ctrl = /bits/ 8 <0x85>; |
| 126 | init-brt = /bits/ 8 <0x10>; |
| 127 | }; |
| 128 | }; |
| 129 | - | |
| 130 | i2c { |
| 131 | #address-cells = <1>; |
| 132 | #size-cells = <0>; |
| 133 | |
| 134 | backlight@2c { |
| 135 | compatible = "ti,lp8557"; |
| 136 | reg = <0x2c>; |
| 137 | enable-supply = <&backlight_vddio>; |
| 138 | power-supply = <&backlight_vdd>; |
| 139 | |
| 140 | dev-ctrl = /bits/ 8 <0x41>; |
| 141 | init-brt = /bits/ 8 <0x0a>; |
| 142 | |
| 143 | /* 4V OV, 4 output LED string enabled */ |
| 144 | rom-14h { |
| 145 | rom-addr = /bits/ 8 <0x14>; |
| 146 | rom-val = /bits/ 8 <0xcf>; |
| 147 | }; |
| 148 | }; |
| 149 | }; |