linux-kernel - Re: [PATCH 1/2] dt-bindings: backlight: add Kinetic KTD2801 binding

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Message-ID: <20231006123014.GA96854@aspen.lan>
Date:   Fri, 6 Oct 2023 13:30:14 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Duje Mihanović <duje.mihanovic@...le.hr>
Cc:     Lee Jones <lee@...nel.org>, Jingoo Han <jingoohan1@...il.com>,
        Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Helge Deller <deller@....de>, Karel Balej <balejk@...fyz.cz>,
        dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fbdev@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH 1/2] dt-bindings: backlight: add Kinetic KTD2801 binding

On Thu, Oct 05, 2023 at 08:49:08PM +0200, Duje Mihanović wrote:
> Add the dt binding for the Kinetic KTD2801 backlight driver.
>
> Signed-off-by: Duje Mihanović <duje.mihanovic@...le.hr>
> ---
>  .../bindings/leds/backlight/kinetic,ktd2801.yaml   | 46 ++++++++++++++++++++++
>  1 file changed, 46 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd2801.yaml b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd2801.yaml
> new file mode 100644
> index 000000000000..970d54bac18e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd2801.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktd2801.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Kinetic Technologies KTD2801 one-wire backlight
> +
> +maintainers:
> +  - Duje Mihanović <duje.mihanovic@...le.hr>
> +
> +description: |
> +  The Kinetic Technologies KTD2801 is a LED backlight driver controlled
> +  by a single GPIO line. The driver can be controlled with a PWM signal
> +  or by pulsing the GPIO line to set the backlight level. This is called
> +  "ExpressWire".
> +
> +allOf:
> +  - $ref: common.yaml#
> +
> +properties:
> +  compatible:
> +    const: kinetic,ktd2801
> +
> +  enable-gpios:
> +    maxItems: 1

Why "enable"? This is the line we are going to us to bitbang the
ExpressWire protocol. Doesn't that make it a control or data pin?


Daniel.