linux-kernel - Re: [PATCH 2/4] dt-bindings: iio: adc: Add the GE HealthCare PMC ADC

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Message-ID: <20241001184602.7912c10d@bootlin.com>
Date: Tue, 1 Oct 2024 18:46:02 +0200
From: Herve Codina <herve.codina@...tlin.com>
To: Conor Dooley <conor@...nel.org>
Cc: Jonathan Cameron <jic23@...nel.org>, Lars-Peter Clausen
 <lars@...afoo.de>, Rob Herring <robh@...nel.org>, Krzysztof Kozlowski
 <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, Luca Ceresoli <luca.ceresoli@...tlin.com>,
 Ian Ray <ian.ray@...ealthcare.com>, Thomas Petazzoni
 <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH 2/4] dt-bindings: iio: adc: Add the GE HealthCare PMC
 ADC

On Tue, 1 Oct 2024 17:18:30 +0100
Conor Dooley <conor@...nel.org> wrote:

> On Tue, Oct 01, 2024 at 09:46:16AM +0200, Herve Codina wrote:
> > The GE HealthCare PMC Analog to Digital Converter (ADC) is a 16-Channel
> > (voltage and current), 16-Bit ADC with an I2C Interface.
> > 
> > Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> > ---
> >  .../bindings/iio/adc/gehc,pmc-adc.yaml        | 82 +++++++++++++++++++
> >  include/dt-bindings/iio/adc/gehc,pmc-adc.h    | 10 +++
...
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  clock-names:
> > +    items:
> > +      - const: osc  
> 
> Since there's no datasheet for me to look up, why is the clock optional?

The component uses an external oscillator (osc) if an external oscillator is
connected to its clock pins. Otherwise, it uses an internal reference clock.

Best regards,
Hervé

-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com