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    SubjectRe: [PATCH v5 2/8] dt-bindings: media: max9286: Document 'maxim,initial-reverse-channel-mV'
    On Mon, Nov 16, 2020 at 02:52:59PM +0100, 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 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@ideasonboard.com>
    > Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.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..f61234d204fa 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:

    Use standard unit suffix.

    > + $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 (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 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>;
    > +
    > ports {
    > #address-cells = <1>;
    > #size-cells = <0>;
    > --
    > 2.29.1
    >

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