| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame^] | 1 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/mfd/richtek,rt4831.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: Richtek RT4831 DSV and Backlight Integrated IC |
| 8 | |
| 9 | maintainers: |
| 10 | - ChiYuan Huang <cy_huang@richtek.com> |
| 11 | |
| 12 | description: | |
| 13 | RT4831 is a multifunctional device that can provide power to the LCD display |
| 14 | and LCD backlight. |
| 15 | |
| 16 | For Display Bias Voltage DSVP and DSVN, the output range is about 4V to 6.5V. |
| 17 | It's sufficient to meet the current LCD power requirement. |
| 18 | |
| 19 | For the LCD backlight, it can provide four channel WLED driving capability. |
| 20 | Each channel driving current is up to 30mA |
| 21 | |
| 22 | Datasheet is available at |
| 23 | https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf |
| 24 | |
| 25 | properties: |
| 26 | compatible: |
| 27 | const: richtek,rt4831 |
| 28 | |
| 29 | reg: |
| 30 | description: I2C device address. |
| 31 | maxItems: 1 |
| 32 | |
| 33 | enable-gpios: |
| 34 | description: | |
| 35 | GPIO to enable/disable the chip. It is optional. |
| 36 | Some usage directly tied this pin to follow VIO 1.8V power on sequence. |
| 37 | maxItems: 1 |
| 38 | |
| 39 | regulators: |
| 40 | $ref: ../regulator/richtek,rt4831-regulator.yaml |
| 41 | |
| 42 | backlight: |
| 43 | $ref: ../leds/backlight/richtek,rt4831-backlight.yaml |
| 44 | |
| 45 | required: |
| 46 | - compatible |
| 47 | - reg |
| 48 | |
| 49 | additionalProperties: false |
| 50 | |
| 51 | examples: |
| 52 | - | |
| 53 | #include <dt-bindings/leds/rt4831-backlight.h> |
| 54 | i2c { |
| 55 | #address-cells = <1>; |
| 56 | #size-cells = <0>; |
| 57 | |
| 58 | rt4831@11 { |
| 59 | compatible = "richtek,rt4831"; |
| 60 | reg = <0x11>; |
| 61 | |
| 62 | regulators { |
| 63 | DSVLCM { |
| 64 | regulator-min-microvolt = <4000000>; |
| 65 | regulator-max-microvolt = <7150000>; |
| 66 | regulator-allow-bypass; |
| 67 | }; |
| 68 | DSVP { |
| 69 | regulator-name = "rt4831-dsvp"; |
| 70 | regulator-min-microvolt = <4000000>; |
| 71 | regulator-max-microvolt = <6500000>; |
| 72 | regulator-boot-on; |
| 73 | }; |
| 74 | DSVN { |
| 75 | regulator-name = "rt4831-dsvn"; |
| 76 | regulator-min-microvolt = <4000000>; |
| 77 | regulator-max-microvolt = <6500000>; |
| 78 | regulator-boot-on; |
| 79 | }; |
| 80 | }; |
| 81 | |
| 82 | backlight { |
| 83 | compatible = "richtek,rt4831-backlight"; |
| 84 | default-brightness = <1024>; |
| 85 | max-brightness = <2048>; |
| 86 | richtek,bled-ovp-sel = /bits/ 8 <RT4831_BLOVPLVL_21V>; |
| 87 | richtek,channel-use = /bits/ 8 <RT4831_BLED_ALLCHEN>; |
| 88 | }; |
| 89 | }; |
| 90 | }; |