linux-kernel - Re: [PATCH v4 2/8] dt-bindings: media: max9286: Document 'maxim,,initial-reverse-channel-mV"

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Message-ID: <3307f226-9dd1-8460-f4a3-56992a0ae191@ideasonboard.com>
Date:   Thu, 12 Nov 2020 22:34:34 +0000
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        laurent.pinchart+renesas@...asonboard.com,
        niklas.soderlund+renesas@...natech.se, geert@...ux-m68k.org
Cc:     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>
Subject: Re: [PATCH v4 2/8] dt-bindings: media: max9286: Document
 'maxim,,initial-reverse-channel-mV"

Hi Jacopo,

in $SUBJECT, there's a double ',' between maxim,,initial and it swaps
from a single quote to a double quote which you might want to fix too.


On 12/11/2020 16:27, Jacopo Mondi wrote:
> Document the 'initial-reverse-channel-mV' vendor property in the
> bindings document of the max9286 driver.
> 
> The newly introduced property allows to specify the initial

s/to specify/specifying/

> configuration of the GMSL reverse control channel to accommodate
> remote serializers pre-programmed with the high threshold power
> supply noise immunity enabled.
> 
> Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> ---
>  .../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..c506a0261325 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,initial-reverse-channel-mV:
> +    $ref: '/schemas/types.yaml#/definitions/uint32'
> +    minimum: 30
> +    maximum: 200
> +    default: 170
> +    description: |
> +      Initial amplitude of the reverse control channel, in millivolts.
> +
> +      The initial amplitude shall be adjusted to a value compatible with the
> +      configuration of the connected remote serializer.
> +
> +      Some camera modules (in example RDACM20) include an on-board MCU that

s/in example/for example/

> +      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 170mV.
> +
> +      A typical value for the reverse channel amplitude to communicate with
> +      a remote serializer whose high-threshold noise immunity is not enabled
> +      is 100mV.
> +
>    ports:
>      type: object
>      description: |
> @@ -221,6 +241,7 @@ required:
>    - ports
>    - i2c-mux
>    - gpio-controller
> +  - maxim,initial-reverse-channel-mV
>  
>  additionalProperties: false
>  
> @@ -243,6 +264,8 @@ examples:
>          gpio-controller;
>          #gpio-cells = <2>;
>  
> +        maxim,initial-reverse-channel-mV = <170>;
> +

Sounds good to me.

Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>

>          ports {
>            #address-cells = <1>;
>            #size-cells = <0>;
>