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Some PWM LED driver chips like TPS92380 and LT3743 require a separate enable signal in addition to PWM control. Add this property to allow device trees to specify such GPIO, which will be controlled automatically by the driver based on the LED brightness state. Signed-off-by: LI Qingwu <Qing-wu.Li@leica-geosystems.com.cn> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> Link: https://patch.msgid.link/20251117054511.730246-1-Qing-wu.Li@leica-geosystems.com.cn Signed-off-by: Lee Jones <lee@kernel.org>
79 lines
1.8 KiB
YAML
79 lines
1.8 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/leds/leds-pwm.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: LEDs connected to PWM
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maintainers:
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- Pavel Machek <pavel@ucw.cz>
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description:
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Each LED is represented as a sub-node of the pwm-leds device. Each
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node's name represents the name of the corresponding LED.
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properties:
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compatible:
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const: pwm-leds
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patternProperties:
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"^led(-[0-9a-f]+)?$":
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type: object
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$ref: common.yaml#
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unevaluatedProperties: false
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properties:
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pwms:
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maxItems: 1
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pwm-names: true
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max-brightness:
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description:
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Maximum brightness possible for the LED
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$ref: /schemas/types.yaml#/definitions/uint32
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default-brightness:
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description:
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Brightness to be set if LED's default state is on. Used only during
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initialization. If the option is not set then max brightness is used.
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$ref: /schemas/types.yaml#/definitions/uint32
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enable-gpios:
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description:
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GPIO for LED hardware enable control. Set active when brightness is
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non-zero and inactive when brightness is zero.
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The GPIO default state follows the "default-state" property.
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maxItems: 1
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required:
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- pwms
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- max-brightness
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additionalProperties: false
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examples:
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- |
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#include <dt-bindings/leds/common.h>
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led-controller {
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compatible = "pwm-leds";
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led-1 {
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label = "omap4::keypad";
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pwms = <&twl_pwm 0 7812500>;
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max-brightness = <127>;
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};
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led-2 {
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color = <LED_COLOR_ID_GREEN>;
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function = LED_FUNCTION_CHARGING;
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pwms = <&twl_pwmled 0 7812500>;
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max-brightness = <255>;
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};
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};
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...
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