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@xxxxxxx> --- v4: - remove not more used allOf keyword - add brightness-levels and default-brightness properties - remove max-brightness and default-brightness from required properties - update example, adding brightness-levels and default-brightness properties v3: - add default value for mps,overvoltage-protection-microvolt property - fix the example, changing from "mps,mp3309c-backlight" to "mps,mp3309c" in compatible property v2: - remove useless properties (dimming-mode, pinctrl-names, pinctrl-0, switch-on-delay-ms, switch-off-delay-ms, reset-gpios, reset-on-delay-ms, reset-on-length-ms) - add common.yaml# - remove already included properties (default-brightness, max-brightness) - substitute three boolean properties, used for the overvoltage-protection values, with a single enum property - remove some conditional definitions - remove the 2nd example v1: - first version .../bindings/leds/backlight/mps,mp3309c.yaml | 82 +++++++++++++++++++ 1 file changed, 82 insertions(+) create mode 100644 Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml diff --git a/Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml b/Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml new file mode 100644 index 000000000000..e2f9ae2b3fb4 --- /dev/null +++ b/Documentation/devicetree/bindings/leds/backlight/mps,mp3309c.yaml @@ -0,0 +1,82 @@ +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/leds/backlight/mps,mp3309c.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: MPS MP3309C backlight + +maintainers: + - Flavio Suligoi <f.suligoi@xxxxxxx> + +description: | + The Monolithic Power (MPS) MP3309C is a WLED step-up converter, featuring a + programmable switching frequency to optimize efficiency. + It supports two different dimming modes: + + - analog mode, via I2C commands, as default mode (32 dimming levels) + - PWM controlled mode (optional) + + The datasheet is available at: + https://www.monolithicpower.com/en/mp3309c.html + +properties: + compatible: + const: mps,mp3309c + + reg: + maxItems: 1 + + pwms: + description: if present, the backlight is controlled in PWM mode. + maxItems: 1 + + enable-gpios: + description: GPIO used to enable the backlight in "analog-i2c" dimming mode. + maxItems: 1 + + brightness-levels: + description: + Array of distinct brightness levels, in PWM dimming mode. + Typically these are in the range from 0 to 255, but any range starting + at 0 will do. + The 0 value means a 0% duty cycle (darkest/off), while the last value in + the array represents a 100% duty cycle (brightest). + $ref: /schemas/types.yaml#/definitions/uint32-array + + default-brightness: + description: + The default brightness (index into the levels array). + $ref: /schemas/types.yaml#/definitions/uint32 + + mps,overvoltage-protection-microvolt: + description: Overvoltage protection (13.5V, 24V or 35.5V). + enum: [ 13500000, 24000000, 35500000 ] + default: 35500000 + + mps,no-sync-mode: + description: disable synchronous rectification mode + type: boolean + +required: + - compatible + - reg + +unevaluatedProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + /* Backlight with PWM control */ + backlight_pwm: backlight@17 { + compatible = "mps,mp3309c"; + reg = <0x17>; + pwms = <&pwm1 0 3333333 0>; /* 300 Hz --> (1/f) * 1*10^9 */ + brightness-levels = <0 1 2 3 4 5 6 7 8 9 10>; + default-brightness = <8>; + mps,overvoltage-protection-microvolt = <24000000>; + }; + }; -- 2.34.1
