Documentation/devicetree/bindings/media/video-interfaces.yaml - linux - Git at Google

 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
 $id: http://devicetree.org/schemas/media/video-interfaces.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#

 title: Common Properties for Video Receiver and Transmitter Interface Endpoints

 maintainers:
   - Sakari Ailus <sakari.ailus@linux.intel.com>
   - Laurent Pinchart <laurent.pinchart@ideasonboard.com>

 description: |
   Video data pipelines usually consist of external devices, e.g. camera sensors,
   controlled over an I2C, SPI or UART bus, and SoC internal IP blocks, including
   video DMA engines and video data processors.

   SoC internal blocks are described by DT nodes, placed similarly to other SoC
   blocks.  External devices are represented as child nodes of their respective
   bus controller nodes, e.g. I2C.

   Data interfaces on all video devices are described by their child 'port' nodes.
   Configuration of a port depends on other devices participating in the data
   transfer and is described by 'endpoint' subnodes.

   device {
       ...
       ports {
           #address-cells = <1>;
           #size-cells = <0>;

           port@0 {
               ...
               endpoint@0 { ... };
               endpoint@1 { ... };
           };
           port@1 { ... };
       };
   };

   If a port can be configured to work with more than one remote device on the same
   bus, an 'endpoint' child node must be provided for each of them.  If more than
   one port is present in a device node or there is more than one endpoint at a
   port, or port node needs to be associated with a selected hardware interface,
   a common scheme using '#address-cells', '#size-cells' and 'reg' properties is
   used.

   All 'port' nodes can be grouped under optional 'ports' node, which allows to
   specify #address-cells, #size-cells properties independently for the 'port'
   and 'endpoint' nodes and any child device nodes a device might have.

   Two 'endpoint' nodes are linked with each other through their 'remote-endpoint'
   phandles.  An endpoint subnode of a device contains all properties needed for
   configuration of this device for data exchange with other device.  In most
   cases properties at the peer 'endpoint' nodes will be identical, however they
   might need to be different when there is any signal modifications on the bus
   between two devices, e.g. there are logic signal inverters on the lines.

   It is allowed for multiple endpoints at a port to be active simultaneously,
   where supported by a device.  For example, in case where a data interface of
   a device is partitioned into multiple data busses, e.g. 16-bit input port
   divided into two separate ITU-R BT.656 8-bit busses.  In such case bus-width
   and data-shift properties can be used to assign physical data lines to each
   endpoint node (logical bus).

   Documenting bindings for devices
   --------------------------------

   All required and optional bindings the device supports shall be explicitly
   documented in device DT binding documentation. This also includes port and
   endpoint nodes for the device, including unit-addresses and reg properties
   where relevant.

 allOf:
   - $ref: /schemas/graph.yaml#/$defs/endpoint-base

 properties:
   slave-mode:
     type: boolean
     description:
       Indicates that the link is run in slave mode. The default when this
       property is not specified is master mode. In the slave mode horizontal and
       vertical synchronization signals are provided to the slave device (data
       source) by the master device (data sink). In the master mode the data
       source device is also the source of the synchronization signals.

   bus-type:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum:
       - 1 # MIPI CSI-2 C-PHY
       - 2 # MIPI CSI1
       - 3 # CCP2
       - 4 # MIPI CSI-2 D-PHY
       - 5 # Parallel
       - 6 # BT.656
       - 7 # DPI
     description:
       Data bus type.

   bus-width:
     $ref: /schemas/types.yaml#/definitions/uint32
     maximum: 64
     description:
       Number of data lines actively used, valid for the parallel busses.

   data-shift:
     $ref: /schemas/types.yaml#/definitions/uint32
     maximum: 64
     description:
       On the parallel data busses, if bus-width is used to specify the number of
       data lines, data-shift can be used to specify which data lines are used,
       e.g. "bus-width=<8>; data-shift=<2>;" means, that lines 9:2 are used.

   hsync-active:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 0, 1 ]
     description:
       Active state of the HSYNC signal, 0/1 for LOW/HIGH respectively.

   vsync-active:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 0, 1 ]
     description:
       Active state of the VSYNC signal, 0/1 for LOW/HIGH respectively. Note,
       that if HSYNC and VSYNC polarities are not specified, embedded
       synchronization may be required, where supported.

   data-active:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 0, 1 ]
     description:
       Similar to HSYNC and VSYNC, specifies data line polarity.

   data-enable-active:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 0, 1 ]
     description:
       Similar to HSYNC and VSYNC, specifies the data enable signal polarity.

   field-even-active:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 0, 1 ]
     description:
       Field signal level during the even field data transmission.

   pclk-sample:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 0, 1, 2 ]
     description:
       Sample data on falling (0), rising (1) or both (2) edges of the pixel
       clock signal.

   sync-on-green-active:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 0, 1 ]
     description:
       Active state of Sync-on-green (SoG) signal, 0/1 for LOW/HIGH respectively.

   data-lanes:
     $ref: /schemas/types.yaml#/definitions/uint32-array
     minItems: 1
     maxItems: 8
     uniqueItems: true
     items:
       # Assume up to 9 physical lane indices
       maximum: 8
     description:
       An array of physical data lane indexes. Position of an entry determines
       the logical lane number, while the value of an entry indicates physical
       lane, e.g. for 2-lane MIPI CSI-2 bus we could have "data-lanes = <1 2>;",
       assuming the clock lane is on hardware lane 0. If the hardware does not
       support lane reordering, monotonically incremented values shall be used
       from 0 or 1 onwards, depending on whether or not there is also a clock
       lane. This property is valid for serial busses only (e.g. MIPI CSI-2).

   clock-lanes:
     $ref: /schemas/types.yaml#/definitions/uint32
     # Assume up to 9 physical lane indices
     maximum: 8
     description:
       Physical clock lane index. Position of an entry determines the logical
       lane number, while the value of an entry indicates physical lane, e.g. for
       a MIPI CSI-2 bus we could have "clock-lanes = <0>;", which places the
       clock lane on hardware lane 0. This property is valid for serial busses
       only (e.g. MIPI CSI-2).

   clock-noncontinuous:
     type: boolean
     description:
       Allow MIPI CSI-2 non-continuous clock mode.

   link-frequencies:
     $ref: /schemas/types.yaml#/definitions/uint64-array
     description:
       Allowed data bus frequencies. For MIPI CSI-2, for instance, this is the
       actual frequency of the bus, not bits per clock per lane value. An array
       of 64-bit unsigned integers.

   lane-polarities:
     $ref: /schemas/types.yaml#/definitions/uint32-array
     minItems: 1
     maxItems: 9
     items:
       enum: [ 0, 1 ]
     description:
       An array of polarities of the lanes starting from the clock lane and
       followed by the data lanes in the same order as in data-lanes. Valid
       values are 0 (normal) and 1 (inverted). The length of the array should be
       the combined length of data-lanes and clock-lanes properties. If the
       lane-polarities property is omitted, the value must be interpreted as 0
       (normal). This property is valid for serial busses only.

   strobe:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [ 0, 1 ]
     description:
       Whether the clock signal is used as clock (0) or strobe (1). Used with
       CCP2, for instance.

 additionalProperties: true
	# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
	%YAML 1.2
	---
	$id: http://devicetree.org/schemas/media/video-interfaces.yaml#
	$schema: http://devicetree.org/meta-schemas/core.yaml#

	title: Common Properties for Video Receiver and Transmitter Interface Endpoints

	maintainers:
	- Sakari Ailus <sakari.ailus@linux.intel.com>
	- Laurent Pinchart <laurent.pinchart@ideasonboard.com>

	description: \|
	Video data pipelines usually consist of external devices, e.g. camera sensors,
	controlled over an I2C, SPI or UART bus, and SoC internal IP blocks, including
	video DMA engines and video data processors.

	SoC internal blocks are described by DT nodes, placed similarly to other SoC
	blocks. External devices are represented as child nodes of their respective
	bus controller nodes, e.g. I2C.

	Data interfaces on all video devices are described by their child 'port' nodes.
	Configuration of a port depends on other devices participating in the data
	transfer and is described by 'endpoint' subnodes.

	device {
	...
	ports {
	#address-cells = <1>;
	#size-cells = <0>;

	port@0 {
	...
	endpoint@0 { ... };
	endpoint@1 { ... };
	};
	port@1 { ... };
	};
	};

	If a port can be configured to work with more than one remote device on the same
	bus, an 'endpoint' child node must be provided for each of them. If more than
	one port is present in a device node or there is more than one endpoint at a
	port, or port node needs to be associated with a selected hardware interface,
	a common scheme using '#address-cells', '#size-cells' and 'reg' properties is
	used.

	All 'port' nodes can be grouped under optional 'ports' node, which allows to
	specify #address-cells, #size-cells properties independently for the 'port'
	and 'endpoint' nodes and any child device nodes a device might have.

	Two 'endpoint' nodes are linked with each other through their 'remote-endpoint'
	phandles. An endpoint subnode of a device contains all properties needed for
	configuration of this device for data exchange with other device. In most
	cases properties at the peer 'endpoint' nodes will be identical, however they
	might need to be different when there is any signal modifications on the bus
	between two devices, e.g. there are logic signal inverters on the lines.

	It is allowed for multiple endpoints at a port to be active simultaneously,
	where supported by a device. For example, in case where a data interface of
	a device is partitioned into multiple data busses, e.g. 16-bit input port
	divided into two separate ITU-R BT.656 8-bit busses. In such case bus-width
	and data-shift properties can be used to assign physical data lines to each
	endpoint node (logical bus).

	Documenting bindings for devices
	--------------------------------

	All required and optional bindings the device supports shall be explicitly
	documented in device DT binding documentation. This also includes port and
	endpoint nodes for the device, including unit-addresses and reg properties
	where relevant.

	allOf:
	- $ref: /schemas/graph.yaml#/$defs/endpoint-base

	properties:
	slave-mode:
	type: boolean
	description:
	Indicates that the link is run in slave mode. The default when this
	property is not specified is master mode. In the slave mode horizontal and
	vertical synchronization signals are provided to the slave device (data
	source) by the master device (data sink). In the master mode the data
	source device is also the source of the synchronization signals.

	bus-type:
	$ref: /schemas/types.yaml#/definitions/uint32
	enum:
	- 1 # MIPI CSI-2 C-PHY
	- 2 # MIPI CSI1
	- 3 # CCP2
	- 4 # MIPI CSI-2 D-PHY
	- 5 # Parallel
	- 6 # BT.656
	- 7 # DPI
	description:
	Data bus type.

	bus-width:
	$ref: /schemas/types.yaml#/definitions/uint32
	maximum: 64
	description:
	Number of data lines actively used, valid for the parallel busses.

	data-shift:
	$ref: /schemas/types.yaml#/definitions/uint32
	maximum: 64
	description:
	On the parallel data busses, if bus-width is used to specify the number of
	data lines, data-shift can be used to specify which data lines are used,
	e.g. "bus-width=<8>; data-shift=<2>;" means, that lines 9:2 are used.

	hsync-active:
	$ref: /schemas/types.yaml#/definitions/uint32
	enum: [ 0, 1 ]
	description:
	Active state of the HSYNC signal, 0/1 for LOW/HIGH respectively.

	vsync-active:
	$ref: /schemas/types.yaml#/definitions/uint32
	enum: [ 0, 1 ]
	description:
	Active state of the VSYNC signal, 0/1 for LOW/HIGH respectively. Note,
	that if HSYNC and VSYNC polarities are not specified, embedded
	synchronization may be required, where supported.

	data-active:
	$ref: /schemas/types.yaml#/definitions/uint32
	enum: [ 0, 1 ]
	description:
	Similar to HSYNC and VSYNC, specifies data line polarity.

	data-enable-active:
	$ref: /schemas/types.yaml#/definitions/uint32
	enum: [ 0, 1 ]
	description:
	Similar to HSYNC and VSYNC, specifies the data enable signal polarity.

	field-even-active:
	$ref: /schemas/types.yaml#/definitions/uint32
	enum: [ 0, 1 ]
	description:
	Field signal level during the even field data transmission.

	pclk-sample:
	$ref: /schemas/types.yaml#/definitions/uint32
	enum: [ 0, 1, 2 ]
	description:
	Sample data on falling (0), rising (1) or both (2) edges of the pixel
	clock signal.

	sync-on-green-active:
	$ref: /schemas/types.yaml#/definitions/uint32
	enum: [ 0, 1 ]
	description:
	Active state of Sync-on-green (SoG) signal, 0/1 for LOW/HIGH respectively.

	data-lanes:
	$ref: /schemas/types.yaml#/definitions/uint32-array
	minItems: 1
	maxItems: 8
	uniqueItems: true
	items:
	# Assume up to 9 physical lane indices
	maximum: 8
	description:
	An array of physical data lane indexes. Position of an entry determines
	the logical lane number, while the value of an entry indicates physical
	lane, e.g. for 2-lane MIPI CSI-2 bus we could have "data-lanes = <1 2>;",
	assuming the clock lane is on hardware lane 0. If the hardware does not
	support lane reordering, monotonically incremented values shall be used
	from 0 or 1 onwards, depending on whether or not there is also a clock
	lane. This property is valid for serial busses only (e.g. MIPI CSI-2).

	clock-lanes:
	$ref: /schemas/types.yaml#/definitions/uint32
	# Assume up to 9 physical lane indices
	maximum: 8
	description:
	Physical clock lane index. Position of an entry determines the logical
	lane number, while the value of an entry indicates physical lane, e.g. for
	a MIPI CSI-2 bus we could have "clock-lanes = <0>;", which places the
	clock lane on hardware lane 0. This property is valid for serial busses
	only (e.g. MIPI CSI-2).

	clock-noncontinuous:
	type: boolean
	description:
	Allow MIPI CSI-2 non-continuous clock mode.

	link-frequencies:
	$ref: /schemas/types.yaml#/definitions/uint64-array
	description:
	Allowed data bus frequencies. For MIPI CSI-2, for instance, this is the
	actual frequency of the bus, not bits per clock per lane value. An array
	of 64-bit unsigned integers.

	lane-polarities:
	$ref: /schemas/types.yaml#/definitions/uint32-array
	minItems: 1
	maxItems: 9
	items:
	enum: [ 0, 1 ]
	description:
	An array of polarities of the lanes starting from the clock lane and
	followed by the data lanes in the same order as in data-lanes. Valid
	values are 0 (normal) and 1 (inverted). The length of the array should be
	the combined length of data-lanes and clock-lanes properties. If the
	lane-polarities property is omitted, the value must be interpreted as 0
	(normal). This property is valid for serial busses only.

	strobe:
	$ref: /schemas/types.yaml#/definitions/uint32
	enum: [ 0, 1 ]
	description:
	Whether the clock signal is used as clock (0) or strobe (1). Used with
	CCP2, for instance.

	additionalProperties: true