| # 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 <jacopo+renesas@jmondi.org> |
| - Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> |
| - Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> |
| - Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> |
| |
| 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 the cameras |
| |
| enable-gpios: |
| description: GPIO connected to the \#PWDN pin with inverted polarity |
| maxItems: 1 |
| |
| gpio-controller: true |
| |
| '#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 |
| |
| 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 |
| <include/dt-bindings/gpio/gpio.h>. |
| |
| 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 |
| |
| required: |
| - compatible |
| - reg |
| - ports |
| - i2c-mux |
| |
| # If 'maxim,gpio-poc' is present, then 'poc-supply' and 'gpio-controller' |
| # are not allowed. |
| if: |
| required: |
| - maxim,gpio-poc |
| then: |
| properties: |
| poc-supply: false |
| gpio-controller: false |
| |
| additionalProperties: false |
| |
| examples: |
| - | |
| #include <dt-bindings/gpio/gpio.h> |
| |
| 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,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>; |
| }; |
| }; |
| }; |
