linux-kernel - Re: [PATCH v6 2/5] dt-bindings: media: max9286: Document 'maxim,reverse-channel-microvolt'

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Message-ID: <X9o+XT3z1sVlh73x@pendragon.ideasonboard.com>
Date:   Wed, 16 Dec 2020 19:05:33 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>
Cc:     kieran.bingham+renesas@...asonboard.com,
        laurent.pinchart+renesas@...asonboard.com,
        niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org,
        robh@...nel.org, devicetree@...r.kernel.org,
        linux-media@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, Hyun Kwon <hyunk@...inx.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        sergei.shtylyov@...il.com
Subject: Re: [PATCH v6 2/5] dt-bindings: media: max9286: Document
 'maxim,reverse-channel-microvolt'

Hi Jacopo,

Thank you for the patch.

On Tue, Dec 15, 2020 at 06:09:54PM +0100, Jacopo Mondi wrote:
> Document the 'reverse-channel-microvolt' vendor property in the
> bindings document of the max9286 driver.
> 
> The newly introduced property allows to specifying the initial
> configuration of the GMSL reverse control channel to accommodate
> remote serializers pre-programmed with the high threshold power
> supply noise immunity enabled.
> 
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> ---
> v5->v6:
> - Use standard unit suffix 'microvolt' for the custom property
> - Drop '$ref' as according to 'example-schema.yaml':
>   "Vendor specific properties having a standard unit suffix don't need a type."
> ---
>  .../bindings/media/i2c/maxim,max9286.yaml     | 23 +++++++++++++++++++
>  1 file changed, 23 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> index 9ea827092fdd..b22ba3e0db4a 100644
> --- a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> @@ -51,6 +51,26 @@ properties:
>    '#gpio-cells':
>      const: 2
> 
> +  maxim,reverse-channel-microvolt:
> +    minimum: 30000
> +    maximum: 200000
> +    default: 170000
> +    description: |
> +      Initial amplitude of the reverse control channel, in micro volts.
> +
> +      The initial amplitude shall be adjusted to a value compatible with the
> +      configuration of the connected remote serializer.
> +
> +      Some camera modules (for example RDACM20) include an on-board MCU that
> +      pre-programs the embedded serializer with power supply noise immunity
> +      (high-threshold) enabled. A typical value of the deserializer's reverse
> +      channel amplitude to communicate with pre-programmed serializers is
> +      170000 micro volts.
> +
> +      A typical value for the reverse channel amplitude to communicate with
> +      a remote serializer whose high-threshold noise immunity is not enabled
> +      is 100000 micro volts
> +
>    ports:
>      type: object
>      description: |
> @@ -221,6 +241,7 @@ required:
>    - ports
>    - i2c-mux
>    - gpio-controller
> +  - maxim,reverse-channel-microvolt
> 
>  additionalProperties: false
> 
> @@ -243,6 +264,8 @@ examples:
>          gpio-controller;
>          #gpio-cells = <2>;
> 
> +        maxim,reverse-channel-microvolt = <170000>;
> +
>          ports {
>            #address-cells = <1>;
>            #size-cells = <0>;

-- 
Regards,

Laurent Pinchart