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

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Message-ID: <Z8A66l02Et4J7hj4@kekkonen.localdomain>
Date: Thu, 27 Feb 2025 10:14:02 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Mathis Foerst <mathis.foerst@...com>
Cc: 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

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.

> +
>  required:
>    - compatible
>    - reg

-- 
Regards,

Sakari Ailus