linux-kernel - Re: [PATCH 02/17] dt-bindings: auxdisplay: ht16k33: Document Adafruit segment displays

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Date:   Wed, 19 May 2021 12:37:02 +0200
From:   Robin van der Gracht <robin@...tonic.nl>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Paul Burton <paulburton@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: [PATCH 02/17] dt-bindings: auxdisplay: ht16k33: Document Adafruit
 segment displays

Hi Rob,

On 2021-05-18 16:35, Geert Uytterhoeven wrote:
> Hoi Robin,
> 
> On Tue, Mar 23, 2021 at 10:12 AM robin <robin@...tonic.nl> wrote:
>> On 2021-03-22 15:48, Geert Uytterhoeven wrote:
>> > The Holtek HT16K33 LED controller is not only used for driving
>> > dot-matrix displays, but also for driving segment displays.
>> >
>> > Document compatible values for the Adafruit 7-segment[1] and
>> > 14-segment[2] FeatherWing expansion boards with red displays.
>> > According
>> > to the schematics, all other Adafruit 7-segment and 14-segment display
>> > backpack and FeatherWing expansion boards (including bare boards and
>> > boards fitted with displays) are compatible with these two boards.
>> > Add a "color" property to support the different color variants.
>> >
>> > [1] https://www.adafruit.com/product/3108
>> > [2] https://www.adafruit.com/product/3130
>> >
>> > Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> 
>> > --- a/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml
>> > +++ b/Documentation/devicetree/bindings/auxdisplay/holtek,ht16k33.yaml
>> > @@ -14,14 +14,23 @@ allOf:
>> >
>> >  properties:
>> >    compatible:
>> > -    const: holtek,ht16k33
>> > +    oneOf:
>> > +      - items:
>> > +          - const: adafruit,3108  # 0.56" 4-Digit 7-Segment
>> > FeatherWing Display (Red)
>> > +          - const: holtek,ht16k33
>> > +
>> > +      - items:
>> > +          - const: adafruit,3130  # 0.54" Quad Alphanumeric
>> > FeatherWing Display (Red)
>> > +          - const: holtek,ht16k33
>> > +
>> > +      - const: holtek,ht16k33     # Generic 16*8 LED controller with
>> > dot-matrix display
>> >
>> >    reg:
>> >      maxItems: 1
>> >
>> >    refresh-rate-hz:
>> >      maxItems: 1
>> > -    description: Display update interval in Hertz
>> > +    description: Display update interval in Hertz for dot-matrix
>> > displays
>> 
>> The above should be included in patch 16
> 
> I disagree: bindings are independent from the driver implementation.
> 
>> >    interrupts:
>> >      maxItems: 1
>> > @@ -41,10 +50,17 @@ properties:
>> >      default: 16
>> >      description: Initial brightness level
>> >
>> > +  color: true
>> > +    description:
>> > +      Color of the display.  Use one of the LED_COLOR_ID_* prefixed
>> > definitions
>> > +      from the header include/dt-bindings/leds/common.h.  The default
>> > is red.
>> > +    minimum: 0
>> > +    maximum: 9
>> > +    default: 1
>> > +
>> 
>> The above should be included in patch 17
> 
> Same here.

My thought was that one without the other makes no sense. But if it's common
practice to create a separate patch for device tree bindings (it's a 
patch-set
after all) than that's fine with me.

@Rob what do you think?

Best regards,
Met vriendelijke groet,

Robin van der Gracht