[PATCH v3 02/23] dt-bindings: media: atmel: csi2dc: add bindings for microchip csi2dc

Eugen Hristev
2021-12-13T13:50:54Z

Add bindings documentation for Microchip CSI2 Demultiplexer controller.

CSI2DC is a demultiplexer from Synopsys IDI interface specification to
parallel interface connection or direct memory access.
CSI2DC can also act as a parallel bypass from a parallel sensor to the
image sensor controller/interface.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
---
Changes in v3:
- Changed to port base as suggested by Rob
- Added properties from video-interfaces which are being used by the csi2dc
- added mention to the parallel port type as input
- did some rephrasing and rewording

Changes in v2:
- changed the endpoint/port references as suggested by Rob

Changes in this version :
- fixed 'sink' name to be actually source.
- added dma properties and example with dma

Previous change log:
Changes in v5:
- modified bindings as per Rob Herring review

Changes in v4:
- Removed property for inter-line-delay and for clock continuous/non-continuous
- Removed virtual channel by reg for second endpoint

Changes in v3:
- Removed some text from description, as it was explained in the schema
- fixed other things as per Rob's review
- moved some text inside the schema, like the clock description

Changes in v2:
- fixed warnings reported by dt_binding_check

.../bindings/media/microchip,csi2dc.yaml | 197 ++++++++++++++++++
1 file changed, 197 insertions(+)
create mode 100644 Documentation/devicetree/bindings/media/microchip,csi2dc.yaml

diff --git a/Documentation/devicetree/bindings/media/microchip,csi2dc.yaml b/Documentation/devicetree/bindings/media/microchip,csi2dc.yaml
new file mode 100644
index 000000000000..e8544fb2d034
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/microchip,csi2dc.yaml
@@ -0,0 +1,197 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/microchip,csi2dc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microchip CSI2 Demux Controller (CSI2DC)
+
+maintainers:
+ - Eugen Hristev <eugen.hristev@microchip.com>
+
+description:
+ CSI2DC - Camera Serial Interface 2 Demux Controller
+
+ CSI2DC is a hardware block that receives incoming data from either from an
+ IDI interface or from a parallel bus interface.
+ It filters IDI packets based on their data type and virtual channel
+ identifier, then converts the byte stream to a pixel stream into a cross
+ clock domain towards a parallel interface that can be read by a sensor
+ controller.
+ IDI interface is Synopsys proprietary.
+ CSI2DC can act a simple bypass bridge if the incoming data is coming from
+ a parallel interface.
+
+ CSI2DC provides two pipes, one video pipe and one data pipe. Video pipe
+ is connected at the output to a sensor controller and the data pipe is
+ accessible as a DMA slave port to a DMA controller.
+
+ CSI2DC supports a single 'port' node as a sink port with either Synopsys
+ 32-bit IDI interface or a parallel interface.
+
+ CSI2DC supports one 'port' node as source port with parallel interface.
+ This is called video pipe.
+ This port has an 'endpoint' that can be connected to a sink port of another
+ controller (next in pipeline).
+
+ CSI2DC also supports direct access to the data through AHB, via DMA channel,
+ called data pipe.
+ For data pipe to be available, a dma controller and a dma channel must be
+ referenced.
+
+properties:
+ compatible:
+ const: microchip,sama7g5-csi2dc
+
+ reg:
+ maxItems: 1
+
+ clocks:
+ minItems: 2
+ maxItems: 2
+
+ clock-names:
+ description:
+ CSI2DC must have two clocks to function correctly. One clock is the
+ peripheral clock for the inside functionality of the hardware block.
+ This is named 'pclk'. The second clock must be the cross domain clock,
+ in which CSI2DC will perform clock crossing. This clock must be fed
+ by the next controller in pipeline, which usually is a sensor controller.
+ Normally this clock should be given by this sensor controller who
+ is also a clock source. This clock is named 'scck', sensor controller clock.
+ items:
+ - const: pclk
+ - const: scck
+
+ dmas:
+ maxItems: 1
+
+ dma-names:
+ const: rx
+
+ ports:
+ $ref: /schemas/graph.yaml#/properties/ports
+
+ properties:
+ port@0:
+ $ref: /schemas/graph.yaml#/$defs/port-base
+ description:
+ Input port node, single endpoint describing the input port.
+
+ properties:
+ endpoint:
+ $ref: video-interfaces.yaml#
+ unevaluatedProperties: false
+ description: Endpoint connected to input device
+
+ properties:
+ bus-type:
+ enum: [4, 5, 6]
+ default: 4
+
+ bus-width:
+ enum: [8, 9, 10, 11, 12, 13, 14]
+ default: 14
+
+ clock-noncontinuous:
+ type: boolean
+ description:
+ Presence of this boolean property decides whether clock is
+ continuous or noncontinuous.
+
+ remote-endpoint: true
+
+ port@1:
+ $ref: /schemas/graph.yaml#/$defs/port-base
+ description:
+ Output port node, single endpoint describing the output port.
+
+ properties:
+ endpoint:
+ unevaluatedProperties: false
+ $ref: video-interfaces.yaml#
+ description: Endpoint connected to output device
+
+ properties:
+ bus-type:
+ enum: [5, 6]
+ default: 5
+
+ bus-width:
+ enum: [8, 9, 10, 11, 12, 13, 14]
+ default: 14
+
+ remote-endpoint: true
+
+ required:
+ - port@0
+ - port@1
+
+additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - clocks
+ - clock-names
+ - ports
+
+examples:
+ # Example for connecting to a parallel sensor controller block (video pipe)
+ # and the input is received from Synopsys IDI interface
+ - |
+ csi2dc@e1404000 {
+ compatible = "microchip,sama7g5-csi2dc";
+ reg = <0xe1404000 0x500>;
+ clocks = <&pclk>, <&scck>;
+ clock-names = "pclk", "scck";
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ port@0 {
+ reg = <0>; /* must be 0, first child port */
+ csi2dc_in: endpoint { /* input from IDI interface */
+ bus-type = <4>; /* MIPI CSI2 D-PHY */
+ remote-endpoint = <&csi2host_out>;
+ };
+ };
+
+ port@1 {
+ reg = <1>; /* must be 1, second child port */
+ csi2dc_out: endpoint {
+ remote-endpoint = <&xisc_in>; /* output to sensor controller */
+ };
+ };
+ };
+ };
+
+ # Example for connecting to a DMA master as an AHB slave
+ # and the input is received from Synopsys IDI interface
+ - |
+ #include <dt-bindings/dma/at91.h>
+ csi2dc@e1404000 {
+ compatible = "microchip,sama7g5-csi2dc";
+ reg = <0xe1404000 0x500>;
+ clocks = <&pclk>, <&scck>;
+ clock-names = "pclk", "scck";
+ dmas = <&dma0 AT91_XDMAC_DT_PERID(34)>;
+ dma-names = "rx";
+
+ ports {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ port@0 {
+ reg = <0>; /* must be 0, first child port */
+ csi2dc_input: endpoint { /* input from IDI interface */
+ remote-endpoint = <&csi2host_out>;
+ };
+ };
+
+ port@1 {
+ reg = <1>;
+ };
+ };
+ };
+
+...
--
2.25.1