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dt-bindings: leds: Convert pwm to yaml

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The example was adapted in the following ways:

- make use of the now supported 'function' and 'color' properties
- remove pwm nodes, those are documented elsewhere
- align node names to new dt schema rules and dt recommendations

License was not explicitly set before.  The license set now is
recommended by DT project.

Suggested-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: Alexander Dahl <post@lespocky.de>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
[For the license change only:]
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Pavel Machek <pavel@ucw.cz>
This commit is contained in:
Alexander Dahl 2020-10-05 22:34:41 +02:00 committed by Pavel Machek
parent 6d8d014c7d
commit 0fe5ac3d96
2 changed files with 70 additions and 50 deletions
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50
Documentation/devicetree/bindings/leds/leds-pwm.txt
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LED connected to PWM
Required properties:
- compatible : should be "pwm-leds".
Each LED is represented as a sub-node of the pwm-leds device. Each
node's name represents the name of the corresponding LED.
LED sub-node properties:
- pwms : PWM property to point to the PWM device (phandle)/port (id) and to
specify the period time to be used: <&phandle id period_ns>;
- pwm-names : (optional) Name to be used by the PWM subsystem for the PWM device
For the pwms and pwm-names property please refer to:
Documentation/devicetree/bindings/pwm/pwm.txt
- max-brightness : Maximum brightness possible for the LED
- active-low : (optional) For PWMs where the LED is wired to supply
rather than ground.
- label : (optional)
see Documentation/devicetree/bindings/leds/common.txt
- linux,default-trigger : (optional)
see Documentation/devicetree/bindings/leds/common.txt
Example:
twl_pwm: pwm {
/* provides two PWMs (id 0, 1 for PWM1 and PWM2) */
compatible = "ti,twl6030-pwm";
#pwm-cells = <2>;
};
twl_pwmled: pwmled {
/* provides one PWM (id 0 for Charing indicator LED) */
compatible = "ti,twl6030-pwmled";
#pwm-cells = <2>;
};
pwmleds {
compatible = "pwm-leds";
kpad {
label = "omap4::keypad";
pwms = <&twl_pwm 0 7812500>;
max-brightness = <127>;
};
charging {
label = "omap4:green:chrg";
pwms = <&twl_pwmled 0 7812500>;
max-brightness = <255>;
};
};

70
Documentation/devicetree/bindings/leds/leds-pwm.yaml Normal file
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%YAML 1.2
---
$id: http://devicetree.org/schemas/leds/leds-pwm.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: LEDs connected to PWM
maintainers:
- Pavel Machek <pavel@ucw.cz>
description:
Each LED is represented as a sub-node of the pwm-leds device. Each
node's name represents the name of the corresponding LED.
properties:
compatible:
const: pwm-leds
patternProperties:
"^led(-[0-9a-f]+)?$":
type: object
$ref: common.yaml#
properties:
pwms:
maxItems: 1
pwm-names: true
max-brightness:
description:
Maximum brightness possible for the LED
$ref: /schemas/types.yaml#/definitions/uint32
active-low:
description:
For PWMs where the LED is wired to supply rather than ground.
type: boolean
required:
- pwms
- max-brightness
additionalProperties: false
examples:
- |
#include <dt-bindings/leds/common.h>
led-controller {
compatible = "pwm-leds";
led-1 {
label = "omap4::keypad";
pwms = <&twl_pwm 0 7812500>;
max-brightness = <127>;
};
led-2 {
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_CHARGING;
pwms = <&twl_pwmled 0 7812500>;
max-brightness = <255>;
};
};
...