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    Subject[PATCH v3 2/4] backlight: rt4831: Adds DT binding document for Richtek RT4831 backlight
    Date
    From: ChiYuan Huang <cy_huang@richtek.com>

    Adds DT binding document for Richtek RT4831 backlight.

    Signed-off-by: ChiYuan Huang <cy_huang@richtek.com>
    ---
    since v3
    - Move inlcude/dt-bindings/leds/rt4831-backlight.h from patch 0004 to here.
    - Add dual license tag in header and backlight binding document.
    - Left backlight dt-binding example only.
    ---
    .../leds/backlight/richtek,rt4831-backlight.yaml | 76 ++++++++++++++++++++++
    include/dt-bindings/leds/rt4831-backlight.h | 23 +++++++
    2 files changed, 99 insertions(+)
    create mode 100644 Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml
    create mode 100644 include/dt-bindings/leds/rt4831-backlight.h

    diff --git a/Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml
    new file mode 100644
    index 00000000..f24c8d1
    --- /dev/null
    +++ b/Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml
    @@ -0,0 +1,76 @@
    +# 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
    +
    +properties:
    + compatible:
    + const: richtek,rt4831-backlight
    +
    + default-brightness:
    + description: |
    + The default brightness that applied to the system on start-up.
    + $ref: /schemas/types.yaml#/definitions/uint32
    + minimum: 0
    + maximum: 2048
    +
    + max-brightness:
    + description: |
    + The max brightness for the H/W limit
    + $ref: /schemas/types.yaml#/definitions/uint32
    + 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
    +
    +examples:
    + - |
    + #include <dt-bindings/leds/rt4831-backlight.h>
    + backlight {
    + compatible = "richtek,rt4831-backlight";
    + default-brightness = <1024>;
    + max-brightness = <2048>;
    + richtek,bled-ovp-sel = /bits/ 8 <RT4831_BLOVPLVL_21V>;
    + richtek,channel-use = /bits/ 8 <RT4831_BLED_ALLCHEN>;
    + };
    diff --git a/include/dt-bindings/leds/rt4831-backlight.h b/include/dt-bindings/leds/rt4831-backlight.h
    new file mode 100644
    index 00000000..125c635
    --- /dev/null
    +++ b/include/dt-bindings/leds/rt4831-backlight.h
    @@ -0,0 +1,23 @@
    +/* 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 */
    --
    2.7.4
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