# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) # Copyright (C) 2019 Renesas Electronics Corp. %YAML 1.2 --- $id: http://devicetree.org/schemas/media/i2c/maxim,max9286.yaml# $schema: http://devicetree.org/meta-schemas/core.yaml# title: Maxim Integrated Quad GMSL Deserializer maintainers: - Jacopo Mondi - Kieran Bingham - Laurent Pinchart - Niklas Söderlund description: | The MAX9286 deserializer receives video data on up to 4 Gigabit Multimedia Serial Links (GMSL) and outputs them on a CSI-2 D-PHY port using up to 4 data lanes. In addition to video data, the GMSL links carry a bidirectional control channel that encapsulates I2C messages. The MAX9286 forwards all I2C traffic not addressed to itself to the other side of the links, where a GMSL serializer will output it on a local I2C bus. In the other direction all I2C traffic received over GMSL by the MAX9286 is output on the local I2C bus. properties: '#address-cells': const: 1 '#size-cells': const: 0 compatible: const: maxim,max9286 reg: description: I2C device address maxItems: 1 poc-supply: description: Regulator providing Power over Coax to all the ports enable-gpios: description: GPIO connected to the \#PWDN pin with inverted polarity maxItems: 1 gpio-controller: true '#gpio-cells': const: 2 maxim,bus-width: $ref: /schemas/types.yaml#/definitions/uint32 enum: [ 24, 27, 32 ] description: | The GMSL serial data bus width. This setting is normally controlled by the BWS pin, but may be overridden with this property. The value must match the configuration of the remote serializers. maxim,i2c-remote-bus-hz: enum: [ 8470, 28300, 84700, 105000, 173000, 339000, 533000, 837000 ] default: 105000 description: | The I2C clock frequency for the remote I2C buses. The value must match the configuration of the remote serializers. 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 maxim,gpio-poc: $ref: /schemas/types.yaml#/definitions/uint32-array minItems: 2 maxItems: 2 description: | Index of the MAX9286 gpio output line (0 or 1) that controls Power over Coax to the cameras and its associated polarity flag. The property accepts an array of two unsigned integers, the first being the gpio line index (0 or 1) and the second being the gpio line polarity flag (GPIO_ACTIVE_HIGH or GPIO_ACTIVE_LOW) as defined in . When the remote cameras power is controlled by one of the MAX9286 gpio lines, this property has to be used to specify which line among the two available ones controls the remote camera power enablement. When this property is used it is not possible to register a gpio controller as the gpio lines are controlled directly by the MAX9286 and not available for consumers, nor the 'poc-supply' property should be specified. ports: $ref: /schemas/graph.yaml#/properties/ports properties: port@0: $ref: /schemas/graph.yaml#/properties/port description: GMSL Input 0 port@1: $ref: /schemas/graph.yaml#/properties/port description: GMSL Input 1 port@2: $ref: /schemas/graph.yaml#/properties/port description: GMSL Input 2 port@3: $ref: /schemas/graph.yaml#/properties/port description: GMSL Input 3 port@4: $ref: /schemas/graph.yaml#/$defs/port-base unevaluatedProperties: false description: CSI-2 Output properties: endpoint: $ref: /schemas/media/video-interfaces.yaml# unevaluatedProperties: false properties: data-lanes: true required: - data-lanes required: - port@4 i2c-mux: type: object $ref: /schemas/i2c/i2c-mux.yaml# unevaluatedProperties: false description: | Each GMSL link is modelled as a child bus of an i2c bus multiplexer/switch. patternProperties: "^i2c@[0-3]$": type: object description: | Child node of the i2c bus multiplexer which represents a GMSL link. Each serializer device on the GMSL link remote end is represented with an i2c-mux child node. The MAX9286 chip supports up to 4 GMSL channels. properties: reg: description: The index of the GMSL channel. maxItems: 1 patternProperties: "^camera@[a-f0-9]+$": type: object description: | The remote camera device, composed by a GMSL serializer and a connected video source. properties: compatible: description: The remote device compatible string. reg: minItems: 2 maxItems: 3 description: | The I2C addresses to be assigned to the remote devices through address reprogramming. The number of entries depends on the requirements of the currently connected remote device. port: $ref: /schemas/graph.yaml#/properties/port description: Connection to the MAX9286 sink. required: - compatible - reg - port additionalProperties: false patternProperties: "^port[0-3]-poc-supply$": description: Regulator providing Power over Coax for a particular port required: - compatible - reg - ports - i2c-mux allOf: # Only one way of specifying power supplies is allowed: 'maxim,gpio-poc', # 'poc-supply' or per-port poc-supply. Additionally, if 'maxim,gpio-poc' is # present, then 'gpio-controller' isn't allowed. - if: required: - maxim,gpio-poc then: properties: poc-supply: false gpio-controller: false patternProperties: "^port[0-3]-poc-supply$": false - if: required: - poc-supply then: patternProperties: "^port[0-3]-poc-supply$": false additionalProperties: false examples: - | #include i2c@e66d8000 { #address-cells = <1>; #size-cells = <0>; reg = <0 0xe66d8000>; gmsl-deserializer@2c { compatible = "maxim,max9286"; reg = <0x2c>; poc-supply = <&camera_poc_12v>; enable-gpios = <&gpio 13 GPIO_ACTIVE_HIGH>; gpio-controller; #gpio-cells = <2>; maxim,i2c-remote-bus-hz = <339000>; maxim,reverse-channel-microvolt = <170000>; ports { #address-cells = <1>; #size-cells = <0>; port@0 { reg = <0>; max9286_in0: endpoint { remote-endpoint = <&rdacm20_out0>; }; }; port@1 { reg = <1>; max9286_in1: endpoint { remote-endpoint = <&rdacm20_out1>; }; }; port@2 { reg = <2>; max9286_in2: endpoint { remote-endpoint = <&rdacm20_out2>; }; }; port@3 { reg = <3>; max9286_in3: endpoint { remote-endpoint = <&rdacm20_out3>; }; }; port@4 { reg = <4>; max9286_out: endpoint { data-lanes = <1 2 3 4>; remote-endpoint = <&csi40_in>; }; }; }; i2c-mux { #address-cells = <1>; #size-cells = <0>; i2c@0 { #address-cells = <1>; #size-cells = <0>; reg = <0>; camera@51 { compatible = "imi,rdacm20"; reg = <0x51>, <0x61>; port { rdacm20_out0: endpoint { remote-endpoint = <&max9286_in0>; }; }; }; }; i2c@1 { #address-cells = <1>; #size-cells = <0>; reg = <1>; camera@52 { compatible = "imi,rdacm20"; reg = <0x52>, <0x62>; port { rdacm20_out1: endpoint { remote-endpoint = <&max9286_in1>; }; }; }; }; i2c@2 { #address-cells = <1>; #size-cells = <0>; reg = <2>; camera@53 { compatible = "imi,rdacm20"; reg = <0x53>, <0x63>; port { rdacm20_out2: endpoint { remote-endpoint = <&max9286_in2>; }; }; }; }; i2c@3 { #address-cells = <1>; #size-cells = <0>; reg = <3>; camera@54 { compatible = "imi,rdacm20"; reg = <0x54>, <0x64>; port { rdacm20_out3: endpoint { remote-endpoint = <&max9286_in3>; }; }; }; }; }; }; /* * Example of a deserializer that controls the camera Power over Coax * through one of its gpio lines. */ gmsl-deserializer@6c { compatible = "maxim,max9286"; reg = <0x6c>; enable-gpios = <&gpio 14 GPIO_ACTIVE_HIGH>; /* * The remote camera power is controlled by MAX9286 GPIO line #0. * No 'poc-supply' nor 'gpio-controller' are specified. */ maxim,gpio-poc = <0 GPIO_ACTIVE_LOW>; /* * Do not describe connections as they're the same as in the previous * example. */ ports { #address-cells = <1>; #size-cells = <0>; port@4 { reg = <4>; }; }; i2c-mux { #address-cells = <1>; #size-cells = <0>; }; }; };