linux-kernel - Re: [PATCH v4 2/3] backlight: rt4831: Adds DT binding document for Richtek RT4831 backlight

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Message-ID: <1608009198.2963.10.camel@richtek.com>
Date:   Tue, 15 Dec 2020 05:13:18 +0000
From:   cy_huang(黃啟原) <cy_huang@...htek.com>
To:     "robh@...nel.org" <robh@...nel.org>,
        "u0084500@...il.com" <u0084500@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "lee.jones@...aro.org" <lee.jones@...aro.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] backlight: rt4831: Adds DT binding document for
 Richtek RT4831 backlight


> On Sat, Dec 12, 2020 at 12:33:43AM +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>
> > ---
> > since v3
> > - Move inlcude/dt-bindings/leds/rt4831-backlight.h from v3 mfd
> > binding patch 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
> > +---
> > +$id: http://devicetree.org/schemas/leds/backlight/richtek,rt4831-b
> > acklight.yaml#
> > +$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.p
> > df
> > +
> > +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>;
> This is in the MFD schema already, so drop the example.
>
Will ack in next series patch.

> >
> > +    };
> > 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@...htek.com>
> > + */
> > +
> > +#ifndef _DT_BINDINGS_RT4831_BACKLIGHT_H
> > +#define _DT_BINDINGS_RT4831_BACKLIGHT_H
> > +
> > +#define RT4831_BLOVPLVL_17V0
> > +#define RT4831_BLOVPLVL_21V1
> > +#define RT4831_BLOVPLVL_25V2
> > +#define RT4831_BLOVPLVL_29V3
> > +
> > +#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 */
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