linux-kernel - Re: [PATCH v2 1/2] dt-bindings: iio: max30100: Add pulse-width property

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Message-ID: <CAHc1_P4L2oiM09YhewH69GHcVW667b0xW5eeH9+UY0xi2aO28w@mail.gmail.com>
Date: Sun, 12 Oct 2025 23:07:16 +0530
From: Shrikant <raskar.shree97@...il.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org, 
	dlechner@...libre.com, nuno.sa@...log.com, andy@...nel.org, matt@...ostay.sg, 
	skhan@...uxfoundation.org, david.hunter.linux@...il.com, 
	linux-iio@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-kernel-mentees@...ts.linux.dev
Subject: Re: [PATCH v2 1/2] dt-bindings: iio: max30100: Add pulse-width property

On Sun, Oct 12, 2025 at 10:36 PM Jonathan Cameron <jic23@...nel.org> wrote:
>
> On Wed,  8 Oct 2025 08:47:36 +0530
> Shrikant Raskar <raskar.shree97@...il.com> wrote:
>
> > The appropriate LED pulse width for the MAX30100 depends on
> > board-specific optical and mechanical design (lens, enclosure,
> > LED-to-sensor distance) and the trade-off between measurement
> > resolution and power consumption. Encoding it in Device Tree
> > documents these platform choices and ensures consistent behavior.
> >
> > Tested on: Raspberry Pi 3B + MAX30100 breakout board.
> >
> > Signed-off-by: Shrikant Raskar <raskar.shree97@...il.com>
> >
> > Changes since v1:
> > Add unit suffix.
> > Drop redundant description.
> >
> > Link to v1:
> > https://lore.kernel.org/all/20251004015623.7019-2-raskar.shree97@gmail.com/
> > ---
> >  .../devicetree/bindings/iio/health/maxim,max30100.yaml      | 6 ++++++
> >  1 file changed, 6 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml b/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml
> > index 967778fb0ce8..5c651a0151cc 100644
> > --- a/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml
> > +++ b/Documentation/devicetree/bindings/iio/health/maxim,max30100.yaml
> > @@ -27,6 +27,11 @@ properties:
> >        LED current whilst the engine is running. First indexed value is
> >        the configuration for the RED LED, and second value is for the IR LED.
> >
> > +  maxim,pulse-width-us:
> > +    maxItems: 1
> > +    description: Pulse width in microseconds
> I continued the discussion on v1 but just to make sure it is not
> missed, add a bit more here briefly touching on factors that govern what
> the right value is here.
I have considered the feedback from v1 and updated the description
with suggested factors. I have shared the v3 patches with updates for your
review.
Thanks and Regards,
Shrikant
>
> > +    enum: [200, 400, 800, 1600]
> > +
> >  additionalProperties: false
> >
> >  required:
> > @@ -44,6 +49,7 @@ examples:
> >              compatible = "maxim,max30100";
> >              reg = <0x57>;
> >              maxim,led-current-microamp = <24000 50000>;
> > +            maxim,pulse-width-us = <1600>;
> >              interrupt-parent = <&gpio1>;
> >              interrupts = <16 2>;
> >          };
>