linux-kernel - Re: [PATCH v2 2/4] backlight: rt4831: Adds DT binding document for Richtek RT4831 backlight

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Date:   Tue, 8 Dec 2020 22:57:17 +0800
From:   ChiYuan Huang <u0084500@...il.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Lee Jones <lee.jones@...aro.org>, cy_huang <cy_huang@...htek.com>,
        lkml <linux-kernel@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 2/4] backlight: rt4831: Adds DT binding document for
 Richtek RT4831 backlight

Rob Herring <robh@...nel.org> 於 2020年12月8日 週二 上午12:42寫道：
>
> On Fri, Dec 04, 2020 at 12:06:33AM +0800, cy_huang wrote:
> > From: ChiYuan Huang <cy_huang@...htek.com>
> >
> > Adds DT binding document for Richtek RT4831 backlight.
> >
> > Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> > ---
> >  .../leds/backlight/richtek,rt4831-backlight.yaml   | 86 ++++++++++++++++++++++
> >  1 file changed, 86 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml
> >
> > 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..df1439a
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/leds/backlight/richtek,rt4831-backlight.yaml
> > @@ -0,0 +1,86 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%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@...htek.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>
> > +    i2c {
> > +      #address-cells = <1>;
> > +      #size-cells = <0>;
> > +
> > +      rt4831@11 {
> > +        compatible = "richtek,rt4831";
> > +        reg = <0x11>;
> > +
> > +        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>;
> > +        };
> > +      };
>
> Just do 1 complete example in the mfd binding.
>
Ack.
> > +    };
> > --
> > 2.7.4
> >