From c00b72491366529be722de20679b169c4f479f39 Mon Sep 17 00:00:00 2001
From: Jacopo Mondi <jacopo+renesas@jmondi.org>
Date: Thu, 14 Jan 2021 18:04:26 +0100
Subject: 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: Rob Herring <robh@kernel.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 .../bindings/media/i2c/maxim,max9286.yaml          | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

(limited to 'Documentation/devicetree/bindings/media')

diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
index bf4fa56ffcc7..ee16102fdfe7 100644
--- a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
+++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
@@ -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>;
-- 
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