media: dt-bindings: Add TI J721E CSI2RX

TI's J721E uses the Cadence CSI2RX and DPHY peripherals to facilitate
capture over a CSI-2 bus. The TI CSI2RX platform driver glues all the
parts together.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Tested-by: Julien Massot <julien.massot@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jai Luthra <j-luthra@ti.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

Documentation/devicetree/bindings/media/ti,j721e-csi2rx-shim.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/ti,j721e-csi2rx-shim.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: TI J721E CSI2RX Shim
+
+description: |
+  The TI J721E CSI2RX Shim is a wrapper around Cadence CSI2RX bridge that
+  enables sending captured frames to memory over PSI-L DMA. In the J721E
+  Technical Reference Manual (SPRUIL1B) it is referred to as "SHIM" under the
+  CSI_RX_IF section.
+
+maintainers:
+  - Jai Luthra <j-luthra@ti.com>
+
+properties:
+  compatible:
+    const: ti,j721e-csi2rx-shim
+
+  dmas:
+    maxItems: 1
+
+  dma-names:
+    items:
+      - const: rx0
+
+  reg:
+    maxItems: 1
+
+  power-domains:
+    maxItems: 1
+
+  ranges: true
+
+  "#address-cells": true
+
+  "#size-cells": true
+
+patternProperties:
+  "^csi-bridge@":
+    type: object
+    description: CSI2 bridge node.
+    $ref: cdns,csi2rx.yaml#
+
+required:
+  - compatible
+  - reg
+  - dmas
+  - dma-names
+  - power-domains
+  - ranges
+  - "#address-cells"
+  - "#size-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/soc/ti,sci_pm_domain.h>
+
+    ti_csi2rx0: ticsi2rx@4500000 {
+        compatible = "ti,j721e-csi2rx-shim";
+        dmas = <&main_udmap 0x4940>;
+        dma-names = "rx0";
+        reg = <0x4500000 0x1000>;
+        power-domains = <&k3_pds 26 TI_SCI_PD_EXCLUSIVE>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+        ranges;
+
+        cdns_csi2rx: csi-bridge@4504000 {
+            compatible = "ti,j721e-csi2rx", "cdns,csi2rx";
+            reg = <0x4504000 0x1000>;
+            clocks = <&k3_clks 26 2>, <&k3_clks 26 0>, <&k3_clks 26 2>,
+              <&k3_clks 26 2>, <&k3_clks 26 3>, <&k3_clks 26 3>;
+            clock-names = "sys_clk", "p_clk", "pixel_if0_clk",
+              "pixel_if1_clk", "pixel_if2_clk", "pixel_if3_clk";
+            phys = <&dphy0>;
+            phy-names = "dphy";
+
+            ports {
+                #address-cells = <1>;
+                #size-cells = <0>;
+
+                csi2_0: port@0 {
+
+                    reg = <0>;
+
+                    csi2rx0_in_sensor: endpoint {
+                        remote-endpoint = <&csi2_cam0>;
+                        bus-type = <4>; /* CSI2 DPHY. */
+                        clock-lanes = <0>;
+                        data-lanes = <1 2>;
+                    };
+                };
+            };
+        };
+    };