linux-kernel - Re: [PATCH v9 4/5] dt-bindings: backlight: Add led-backlight binding

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Date:   Mon, 7 Oct 2019 11:15:17 -0500
From:   Rob Herring <robh+dt@...nel.org>
To:     Jean-Jacques Hiblot <jjhiblot@...com>
Cc:     Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>,
        Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Daniel Thompson <daniel.thompson@...aro.org>,
        Dan Murphy <dmurphy@...com>,
        Linux LED Subsystem <linux-leds@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Tomi Valkeinen <tomi.valkeinen@...com>
Subject: Re: [PATCH v9 4/5] dt-bindings: backlight: Add led-backlight binding

Please send DT bindings to DT list or it's never in my queue. IOW,
send patches to the lists that get_maintainers.pl tells you to.

On Mon, Oct 7, 2019 at 7:45 AM Jean-Jacques Hiblot <jjhiblot@...com> wrote:
>
> Add DT binding for led-backlight.
>
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@...com>
> Reviewed-by: Daniel Thompson <daniel.thompson@...aro.org>
> Reviewed-by: Sebastian Reichel <sebastian.reichel@...labora.com>
> ---
>  .../bindings/leds/backlight/led-backlight.txt | 28 +++++++++++++++++++
>  1 file changed, 28 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/backlight/led-backlight.txt

Please make this a DT schema.

> diff --git a/Documentation/devicetree/bindings/leds/backlight/led-backlight.txt b/Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
> new file mode 100644
> index 000000000000..4c7dfbe7f67a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/led-backlight.txt
> @@ -0,0 +1,28 @@
> +led-backlight bindings
> +
> +This binding is used to describe a basic backlight device made of LEDs.
> +It can also be used to describe a backlight device controlled by the output of
> +a LED driver.
> +
> +Required properties:
> +  - compatible: "led-backlight"
> +  - leds: a list of LEDs

'leds' is already used as a node name and mixing is not ideal.

We already have 'flash-leds' in use and with the same definition, so
lets continue that and use 'backlight-leds'.

> +
> +Optional properties:
> +  - brightness-levels: Array of distinct brightness levels. The levels must be
> +                       in the range accepted by the underlying LED devices.
> +                       This is used to translate a backlight brightness level
> +                       into a LED brightness level. If it is not provided, the
> +                       identity mapping is used.
> +
> +  - default-brightness-level: The default brightness level.

You can just assume these 2 get a common schema at some point. So just
need to define any additional constraints if possible.

Rob