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The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a programmable switching frequency to optimize efficiency. The brightness can be controlled either by I2C commands (called "analog" mode) or by a PWM input signal (PWM mode). This driver supports both modes. For device driver details, please refer to: - drivers/video/backlight/mp3309c_bl.c The datasheet is available at: - https://www.monolithicpower.com/en/mp3309c.html Signed-off-by: Flavio Suligoi <f.suligoi@asem.it> Reviewed-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20230925122609.78849-1-f.suligoi@asem.it Signed-off-by: Lee Jones <lee@kernel.org>
74 lines
1.7 KiB
YAML
74 lines
1.7 KiB
YAML
# 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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$id: http://devicetree.org/schemas/leds/backlight/mps,mp3309c.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: MPS MP3309C backlight
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maintainers:
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- Flavio Suligoi <f.suligoi@asem.it>
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description: |
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The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a
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programmable switching frequency to optimize efficiency.
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It supports two different dimming modes:
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- analog mode, via I2C commands (default)
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- PWM controlled mode.
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The datasheet is available at:
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https://www.monolithicpower.com/en/mp3309c.html
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allOf:
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- $ref: common.yaml#
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properties:
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compatible:
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const: mps,mp3309c
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reg:
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maxItems: 1
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pwms:
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description: if present, the backlight is controlled in PWM mode.
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maxItems: 1
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enable-gpios:
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description: GPIO used to enable the backlight in "analog-i2c" dimming mode.
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maxItems: 1
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mps,overvoltage-protection-microvolt:
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description: Overvoltage protection (13.5V, 24V or 35.5V).
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enum: [ 13500000, 24000000, 35500000 ]
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default: 35500000
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mps,no-sync-mode:
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description: disable synchronous rectification mode
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type: boolean
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required:
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- compatible
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- reg
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- max-brightness
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- default-brightness
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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 with PWM control */
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backlight_pwm: backlight@17 {
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compatible = "mps,mp3309c";
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reg = <0x17>;
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pwms = <&pwm1 0 3333333 0>; /* 300 Hz --> (1/f) * 1*10^9 */
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max-brightness = <100>;
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default-brightness = <80>;
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mps,overvoltage-protection-microvolt = <24000000>;
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};
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};
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