linux-kernel - Re: [PATCH v3 3/4] regulator: rt4831: Adds DT binding document for Richtek RT4831 DSV regulator

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Date:   Fri, 11 Dec 2020 18:42:20 +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 v3 3/4] regulator: rt4831: Adds DT binding document for
 Richtek RT4831 DSV regulator

Rob Herring <robh@...nel.org> 於 2020年12月10日 週四 下午11:17寫道：
>
> On Tue, Dec 08, 2020 at 11:54:45PM +0800, cy_huang wrote:
> > From: ChiYuan Huang <cy_huang@...htek.com>
> >
> > Adds DT binding document for Richtek RT4831 DSV regulator.
> >
> > Signed-off-by: ChiYuan Huang <cy_huang@...htek.com>
> > ---
> > since v3
> > - Add dual license tag in regulator binding document.
> > - Left regulator dt-binding example only.
> > ---
> >  .../regulator/richtek,rt4831-regulator.yaml        | 57 ++++++++++++++++++++++
> >  1 file changed, 57 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/regulator/richtek,rt4831-regulator.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/regulator/richtek,rt4831-regulator.yaml b/Documentation/devicetree/bindings/regulator/richtek,rt4831-regulator.yaml
> > new file mode 100644
> > index 00000000..c6741f2
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/regulator/richtek,rt4831-regulator.yaml
> > @@ -0,0 +1,57 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/regulator/richtek,rt4831-regulator.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Richtek RT4831 Display Bias Voltage Regulator
> > +
> > +maintainers:
> > +  - ChiYuan Huang <cy_huang@...htek.com>
> > +
> > +description: |
> > +  RT4831 is a multifunctional device that can provide power to the LCD display
> > +  and LCD backlight.
> > +
> > +  For Display Bias Voltage DSVP and DSVN, the output range is about 4V to 6.5V.
> > +  It is sufficient to meet the current LCD power requirement.
> > +
> > +  DSVLCM is a boost regulator in IC internal as DSVP and DSVN input power.
> > +  Its voltage should be configured above 0.15V to 0.2V gap larger than the
> > +  voltage needed for DSVP and DSVN. Too much voltage gap could improve the
> > +  voltage drop from the heavy loading scenario. But it also make the power
> > +  efficiency worse. It's a trade-off.
> > +
> > +  Datasheet is available at
> > +  https://www.richtek.com/assets/product_file/RT4831A/DS4831A-05.pdf
> > +
> > +patternProperties:
> > +  "^DSV(LCM|P|N)$":
> > +    type: object
> > +    $ref: regulator.yaml#
> > +    description:
> > +      Properties for single Display Bias Voltage regulator.
>
> Just put this into the MFD schema directly if you don't have any custom
> properties to add.
>
OK, I'll directly remove rt4831 regulator dt-binding and put the
descriptions into mfd binding.
Ack in next series of patch.
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    regulators {
> > +      DSVLCM {
> > +        regulator-min-microvolt = <4000000>;
> > +        regulator-max-microvolt = <7150000>;
> > +        regulator-allow-bypass;
> > +      };
> > +      DSVP {
> > +        regulator-name = "rt4831-dsvp";
> > +        regulator-min-microvolt = <4000000>;
> > +        regulator-max-microvolt = <6500000>;
> > +        regulator-boot-on;
> > +      };
> > +      DSVN {
> > +        regulator-name = "rt4831-dsvn";
> > +        regulator-min-microvolt = <4000000>;
> > +        regulator-max-microvolt = <6500000>;
> > +        regulator-boot-on;
> > +      };
> > +    };
> > --
> > 2.7.4
> >