Commit c00b7249 authored by Jacopo Mondi's avatar Jacopo Mondi Committed by Mauro Carvalho Chehab
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media: dt-bindings: media: max9286: Document 'maxim,reverse-channel-microvolt' 



Document the 'maxim,reverse-channel-microvolt' vendor property in the
bindings document of the max9286 driver.

The newly introduced property allows to specify 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: default avatarRob Herring <robh@kernel.org>
Reviewed-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: default avatarKieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: default avatarJacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: default avatarSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+huawei@kernel.org>
parent a59f853b

Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml

+22 −0
Original line number Diff line number Diff line
@@ -50,6 +50,26 @@ 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:

    $ref: /schemas/graph.yaml#/properties/ports
@@ -185,6 +205,8 @@ examples: 
        gpio-controller;

        #gpio-cells = <2>;



        maxim,reverse-channel-microvolt = <170000>;



        ports {

          #address-cells = <1>;

          #size-cells = <0>;