Re: [PATCH v2 2/4] backlight: rt4831: Adds DT binding document for Richtek RT4831 backlight
From: ChiYuan Huang
Date: Tue Dec 08 2020 - 09:58:18 EST
Rob Herring <robh@xxxxxxxxxx> 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@xxxxxxxxxxx>
> >
> > Adds DT binding document for Richtek RT4831 backlight.
> >
> > Signed-off-by: ChiYuan Huang <cy_huang@xxxxxxxxxxx>
> > ---
> > .../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@xxxxxxxxxxx>
> > +
> > +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
> >