linux-kernel - Re: [PATCH v1 2/8] MT9M114: Add pad-slew-rate DT-binding

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Message-ID: <20250228-helpless-delivery-42162772caa3@spud>
Date: Fri, 28 Feb 2025 19:11:31 +0000
From: Conor Dooley <conor@...nel.org>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc: Mathis Foerst <mathis.foerst@...com>, linux-kernel@...r.kernel.org,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, linux-media@...r.kernel.org,
	devicetree@...r.kernel.org, manuel.traut@...com
Subject: Re: [PATCH v1 2/8] MT9M114: Add pad-slew-rate DT-binding

On Thu, Feb 27, 2025 at 10:14:02AM +0000, Sakari Ailus wrote:
> Hi Mathis,
> 
> On Wed, Feb 26, 2025 at 04:39:23PM +0100, Mathis Foerst wrote:
> > The MT9M114 supports the different slew rates (0 to 7) on the output pads.
> 
> "the output pads" probably means pixel data interface (DVP or CSI-2)
> signals in this cases? I suppose this is about clock modulation?
> It'd be good to say that.
> 
> > At the moment, this is hardcoded to 7 (the fastest rate).
> > The user might want to change this values due to EMC requirements.
> > 
> > Add the 'pad-slew-rate' property to the MT9M114 DT-bindings for selecting
> > the desired slew rate.
> > 
> > Signed-off-by: Mathis Foerst <mathis.foerst@...com>
> > ---
> >  .../devicetree/bindings/media/i2c/onnn,mt9m114.yaml         | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/media/i2c/onnn,mt9m114.yaml b/Documentation/devicetree/bindings/media/i2c/onnn,mt9m114.yaml
> > index 72e258d57186..666afe10c538 100644
> > --- a/Documentation/devicetree/bindings/media/i2c/onnn,mt9m114.yaml
> > +++ b/Documentation/devicetree/bindings/media/i2c/onnn,mt9m114.yaml
> > @@ -74,6 +74,12 @@ properties:
> >      description: Bypass the internal PLL of the sensor to use EXTCLK directly as SYSCLK.
> >      type: boolean
> >  
> > +  onnn,slew-rate:
> > +    $ref: /schemas/types.yaml#/definitions/uint8
> 
> No need to make this 8-bit (i.e. just use 32 bits).
> 
> > +    description: Slew rate ot the output pads DOUT[7:0], LINE_VALID, FRAME_VALID and PIXCLK
> 
> Please wrap at 80 characters.
> 
> Is there more information on the effect than 7 is the fastest?
> 
> > +    minimum: 0
> > +    maximum: 7
> 
> Please also add a default.

It'd also be great (IMO) if it were given in terms of actual units, not
nebulous values that I assume to be the register values.

> 
> > +
> >  required:
> >    - compatible
> >    - reg
> 
> -- 
> Regards,
> 
> Sakari Ailus

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