Commit f3e6c298 authored by ChiYuan Huang's avatar ChiYuan Huang Committed by Lee Jones
Browse files

backlight: rt4831: Adds DT binding document for Richtek RT4831 backlight 



Adds DT binding document for Richtek RT4831 backlight.

Signed-off-by: default avatarChiYuan Huang <cy_huang@richtek.com>
Reviewed-by: default avatarDaniel Thompson <daniel.thompson@linaro.org>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 6d1c32db

Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml

0 → 100644
+62 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)

%YAML 1.2

---

$id: http://devicetree.org/schemas/leds/backlight/richtek,rt4831-backlight.yaml#

$schema: http://devicetree.org/meta-schemas/core.yaml#



title: Richtek RT4831 Backlight



maintainers:

  - ChiYuan Huang <cy_huang@richtek.com>



description: |

  RT4831 is a mutifunctional device that can provide power to the LCD display

  and LCD backlight.



  For the LCD backlight, it can provide four channel WLED driving capability.

  Each channel driving current is up to 30mA



  Datasheet is available at

  https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf



allOf:

  - $ref: common.yaml#



properties:

  compatible:

    const: richtek,rt4831-backlight



  default-brightness:

    minimum: 0

    maximum: 2048



  max-brightness:

    minimum: 0

    maximum: 2048



  richtek,pwm-enable:

    description: |

      Specify the backlight dimming following by PWM duty or by SW control.

    type: boolean



  richtek,bled-ovp-sel:

    description: |

      Backlight OVP level selection, currently support 17V/21V/25V/29V.

    $ref: /schemas/types.yaml#/definitions/uint8

    default: 1

    minimum: 0

    maximum: 3



  richtek,channel-use:

    description: |

      Backlight LED channel to be used.

      BIT 0/1/2/3 is used to indicate led channel 1/2/3/4 enable or disable.

    $ref: /schemas/types.yaml#/definitions/uint8

    minimum: 1

    maximum: 15



required:

  - compatible

  - richtek,channel-use



additionalProperties: false

include/dt-bindings/leds/rt4831-backlight.h

0 → 100644
+23 −0
Original line number Diff line number Diff line 
/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */

/*

 * This header provides constants for rt4831 backlight bindings.

 *

 * Copyright (C) 2020, Richtek Technology Corp.

 * Author: ChiYuan Huang <cy_huang@richtek.com>

 */



#ifndef _DT_BINDINGS_RT4831_BACKLIGHT_H

#define _DT_BINDINGS_RT4831_BACKLIGHT_H



#define RT4831_BLOVPLVL_17V	0

#define RT4831_BLOVPLVL_21V	1

#define RT4831_BLOVPLVL_25V	2

#define RT4831_BLOVPLVL_29V	3



#define RT4831_BLED_CH1EN	(1 << 0)

#define RT4831_BLED_CH2EN	(1 << 1)

#define RT4831_BLED_CH3EN	(1 << 2)

#define RT4831_BLED_CH4EN	(1 << 3)

#define RT4831_BLED_ALLCHEN	((1 << 4) - 1)



#endif /* _DT_BINDINGS_RT4831_BACKLIGHT_H */