# Re: \[PATCH 1/2\] dt-bindings: leds: backlight: add Kinetic KTD3137

- From: Roman Vivchar \<rva333@protonmail.com\>
- Date: 2026-11-03 14:34:09 
- List: linux-fbdev
- Page: https://ratatoskr.run/linux-fbdev/2026/11/17853378
- Thread: https://ratatoskr.run/dri-devel/2026/11/17847320/t.md

```text
Hi Daniel,

On Tuesday, November 3rd, 2026 at 4:05 PM, Daniel Thompson [ref] wrote:

> On Mon, Nov 02, 2026 at 09:58:48PM +0200, Roman Vivchar via B4 Relay wrote:
> > From: Roman Vivchar <rva333@protonmail.com>
> >
> > Kinetic KTD3137 is an LED IC, used in various mobile devices for the
> > display backlight. Add devicetree bindings documentation for this chip.
> >
> > Datasheet: https://www.kinet-ic.com/uploads/KTD3137-04a.pdf
> >
> > Signed-off-by: Roman Vivchar <rva333@protonmail.com>
> > ---
> >  .../bindings/leds/backlight/kinetic,ktd3137.yaml   | 64 ++++++++++++++++++++++
> >  MAINTAINERS                                        |  5 ++
> >  2 files changed, 69 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd3137.yaml b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd3137.yaml
> > new file mode 100644
> > index 000000000000..140615640a9a
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/leds/backlight/kinetic,ktd3137.yaml
> > @@ -0,0 +1,64 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/leds/backlight/kinetic,ktd3137.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Kinetic Technologies KTD3137 LED Backlight
> > +
> > +maintainers:
> > +  - Roman Vivchar [ref]
> > +
> > +description:
> > +  The Kinetic Technologies KTD3137 is an I2C LED backlight driver for medium
> > +  to large size LCD panels.
> > <snip>
> > +  led-max-microamp:
> > +    minimum: 5000
> > +    maximum: 29800
> > +    default: 20200
> > +
> > +  vin-supply: true
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - vin-supply
> 
> Why is vin-supply required?
>

The chip cannot function without VIN power supply. Even if it's on the
always-on power rail on certain board, there's always a chance it might be
accidentally left disabled on the other. It's better to document supply in
the bindings as far as I understand.

Best regards,
Roman

> 
> Daniel.
> 
```