150 lines
3.5 KiB
YAML
150 lines
3.5 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/leds/backlight/lp855x-backlight.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Texas Instruments LP855X backlight controllers
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maintainers:
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- Artur Weber <aweber.kernel@gmail.com>
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properties:
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compatible:
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enum:
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- ti,lp8550
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- ti,lp8551
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- ti,lp8552
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- ti,lp8553
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- ti,lp8555
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- ti,lp8556
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- ti,lp8557
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reg:
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maxItems: 1
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dev-ctrl:
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$ref: /schemas/types.yaml#/definitions/uint8
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description:
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Value of device control register. This is a device-specific value.
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bl-name:
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$ref: /schemas/types.yaml#/definitions/string
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description: Backlight device name.
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init-brt:
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$ref: /schemas/types.yaml#/definitions/uint8
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description: Initial value of backlight brightness.
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power-supply:
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description: Regulator which controls the 3V rail.
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enable-supply:
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description: Regulator which controls the EN/VDDIO input.
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pwms:
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maxItems: 1
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description: |
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PWM channel to use for controlling the backlight; setting this
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enables the PWM-based backlight control mode.
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pwm-names: true
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pwm-period:
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$ref: /schemas/types.yaml#/definitions/uint32
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description:
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PWM period value. Deprecated; set the period value in the pwms
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property instead.
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deprecated: true
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patternProperties:
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"^rom-[0-9a-f]{2}h$":
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type: object
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description: Nodes containing the values of configuration registers.
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additionalProperties: false
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properties:
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rom-addr:
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$ref: /schemas/types.yaml#/definitions/uint8
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description: Register address of ROM area to be updated.
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rom-val:
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$ref: /schemas/types.yaml#/definitions/uint8
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description: Value to write to the ROM register.
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required:
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- compatible
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- reg
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- dev-ctrl
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unevaluatedProperties: false
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examples:
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- |
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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backlight@2c {
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compatible = "ti,lp8555";
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reg = <0x2c>;
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dev-ctrl = /bits/ 8 <0x00>;
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pwms = <&pwm 0 10000>;
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pwm-names = "lp8555";
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/* 4V OV, 4 output LED0 string enabled */
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rom-14h {
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rom-addr = /bits/ 8 <0x14>;
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rom-val = /bits/ 8 <0xcf>;
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};
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/* Heavy smoothing, 24ms ramp time step */
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rom-15h {
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rom-addr = /bits/ 8 <0x15>;
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rom-val = /bits/ 8 <0xc7>;
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};
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/* 4 output LED1 string enabled */
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rom-19h {
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rom-addr = /bits/ 8 <0x19>;
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rom-val = /bits/ 8 <0x0f>;
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};
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};
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};
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- |
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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backlight@2c {
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compatible = "ti,lp8556";
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reg = <0x2c>;
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bl-name = "lcd-bl";
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dev-ctrl = /bits/ 8 <0x85>;
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init-brt = /bits/ 8 <0x10>;
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};
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};
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- |
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i2c {
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#address-cells = <1>;
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#size-cells = <0>;
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backlight@2c {
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compatible = "ti,lp8557";
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reg = <0x2c>;
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enable-supply = <&backlight_vddio>;
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power-supply = <&backlight_vdd>;
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dev-ctrl = /bits/ 8 <0x41>;
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init-brt = /bits/ 8 <0x0a>;
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/* 4V OV, 4 output LED string enabled */
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rom-14h {
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rom-addr = /bits/ 8 <0x14>;
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rom-val = /bits/ 8 <0xcf>;
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};
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};
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};
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