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Date:   Mon, 14 Dec 2020 15:14:09 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     ChiYuan Huang <u0084500@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.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 v4 2/3] backlight: rt4831: Adds DT binding document for
 Richtek RT4831 backlight

On Mon, Dec 14, 2020 at 10:40:55PM +0800, ChiYuan Huang wrote:
> Hi,
> 
> Daniel Thompson <daniel.thompson@...aro.org> 於 2020年12月14日 週一 下午5:59寫道:
> >
> > Hi CY
> >
> > 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>
> >
> > This patch got keyword filtered and brought to my attention
> > but the rest of the series did not.
> >
> > If it was a backlight patch series you need to send it To: the
> > all the backlight maintainers.
> >
> Yes, I'm waiting for mfd reviewing.
> Due to mfd patch, I need to add backlight dt-binding patch prior to
> backlight source code.
> Or autobuild robot will said mfd dt-binding build fail from Rob.
> That's why I send the backlight dt-binding prior to the source code.
> 
> I still have backlight/regulator source code patch after mfd reviewing.
> Do you want me to send all the patches without waiting for mfd reviewing?

To some extent it's up to you.

I think I would have shared all the pieces at once (although not it Lee,
as mfd maintainer, had suggested otherwise).


Daniel.


> >
> > Daniel.
> >
> >
> > > ---
> > > 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
> > > +---
> > > +$id: http://devicetree.org/schemas/leds/backlight/richtek,rt4831-backlight.yaml#
> > > +$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>
> > > +    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@...htek.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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