linux-kernel - Re: [PATCH v4 2/2] dt-bindings: leds: backlight: Add Kinetic KTZ8866 backlight

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Date:   Tue, 17 Jan 2023 14:22:04 +0000
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Jianhua Lu <lujianhua000@...il.com>
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>,
        Helge Deller <deller@....de>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-leds@...r.kernel.org,
        devicetree@...r.kernel.org, linux-fbdev@...r.kernel.org
Subject: Re: [PATCH v4 2/2] dt-bindings: leds: backlight: Add Kinetic KTZ8866
 backlight

On Tue, Jan 17, 2023 at 09:47:42PM +0800, Jianhua Lu wrote:
> Add Kinetic KTZ8866 backlight binding documentation.
>
> Signed-off-by: Jianhua Lu <lujianhua000@...il.com>

Might be a good idea to take a look at this bit of the docs because
the patchset is not in the right order (I.5):
https://docs.kernel.org/devicetree/bindings/submitting-patches.html


> ---
> Changes in v2:
>   - Remove "items" between "compatible" and "const: kinetic,ktz8866"
>   - Change "additionalProperties" to "unevaluatedProperties"
>
> Changes in v3:
>   - Add Krzysztof's R-b
>
> Changes in v4:
>   - Drop Krzysztof's R-b
>   - Add some new properties
>
>  .../leds/backlight/kinetic,ktz8866.yaml       | 54 +++++++++++++++++++
>  1 file changed, 54 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
>
> diff --git a/Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
> new file mode 100644
> index 000000000000..18571d69accb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktz8866.yaml
> @@ -0,0 +1,54 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktz8866.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Kinetic Technologies KTZ8866 backlight
> +
> +maintainers:
> +  - Jianhua Lu <lujianhua000@...il.com>
> +
> +description: |
> +  The Kinetic Technologies KTZ8866 is a high efficiency 6-sinks led backlight
> +  with dual lcd bias power.
> +  https://www.kinet-ic.com/ktz8866/
> +
> +allOf:
> +  - $ref: common.yaml#
> +
> +properties:
> +  compatible:
> +    const: kinetic,ktz8866
> +
> +  current-num-sinks:
> +    description: Number of LED current sinks.
> +
> +  current-ramping-time:
> +    description: LED current ramping time.

Needs to document know what units this value is expressed in. IIRC
this should be expressed in SI units and included the property name.
Something like:

  current-ramping-time-us:
    description: LED current ramping time in microseconds.


> +
> +  led-ramping-time:
> +    description: LED on/off ramping time.

+1


Daniel.