media: dt-bindings: media: Add i.MX8 ISI DT bindings

The Image Sensing Interface (ISI) combines image processing pipelines
with DMA engines to process and capture frames originating from a
variety of sources. The inputs to the ISI go through Pixel Link
interfaces, and their number and nature is SoC-dependent. They cover
both capture interfaces (MIPI CSI-2 RX, HDMI RX) and memory inputs.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

Documentation/devicetree/bindings/media/nxp,imx8-isi.yaml

@@ -0,0 +1,173 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/nxp,imx8-isi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: i.MX8 Image Sensing Interface
+
+maintainers:
+  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+
+description: |
+  The Image Sensing Interface (ISI) combines image processing pipelines with
+  DMA engines to process and capture frames originating from a variety of
+  sources. The inputs to the ISI go through Pixel Link interfaces, and their
+  number and nature is SoC-dependent. They cover both capture interfaces (MIPI
+  CSI-2 RX, HDMI RX, ...) and display engine outputs for writeback support.
+
+properties:
+  compatible:
+    enum:
+      - fsl,imx8mn-isi
+      - fsl,imx8mp-isi
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: The AXI clock
+      - description: The APB clock
+      # TODO: Check if the per-channel ipg_proc_clk clocks need to be specified
+      # as well, in case some SoCs have the ability to control them separately.
+      # This may be the case of the i.MX8[DQ]X(P)
+
+  clock-names:
+    items:
+      - const: axi
+      - const: apb
+
+  fsl,blk-ctrl:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      A phandle referencing the block control that contains the CSIS to ISI
+      gasket.
+
+  interrupts:
+    description: Processing pipeline interrupts, one per pipeline
+    minItems: 1
+    maxItems: 2
+
+  power-domains:
+    maxItems: 1
+
+  ports:
+    $ref: /schemas/graph.yaml#/properties/ports
+    description: |
+      Ports represent the Pixel Link inputs to the ISI. Their number and
+      assignment are model-dependent. Each port shall have a single endpoint.
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - fsl,blk-ctrl
+  - ports
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: fsl,imx8mn-isi
+    then:
+      properties:
+        interrupts:
+          maxItems: 1
+        ports:
+          properties:
+            port@0:
+              description: MIPI CSI-2 RX
+          required:
+            - port@0
+
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: fsl,imx8mp-isi
+    then:
+      properties:
+        interrupts:
+          maxItems: 2
+        ports:
+          properties:
+            port@0:
+              description: MIPI CSI-2 RX 0
+            port@1:
+              description: MIPI CSI-2 RX 1
+          required:
+            - port@0
+            - port@1
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8mn-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/power/imx8mn-power.h>
+
+    isi@32e20000 {
+        compatible = "fsl,imx8mn-isi";
+        reg = <0x32e20000 0x100>;
+        interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clk IMX8MN_CLK_DISP_AXI_ROOT>,
+                 <&clk IMX8MN_CLK_DISP_APB_ROOT>;
+        clock-names = "axi", "apb";
+        fsl,blk-ctrl = <&disp_blk_ctrl>;
+        power-domains = <&disp_blk_ctrl IMX8MN_DISPBLK_PD_ISI>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+                isi_in: endpoint {
+                    remote-endpoint = <&mipi_csi_out>;
+                };
+            };
+        };
+    };
+
+  - |
+    #include <dt-bindings/clock/imx8mp-clock.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    isi@32e00000 {
+        compatible = "fsl,imx8mp-isi";
+        reg = <0x32e00000 0x4000>;
+        interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&clk IMX8MP_CLK_MEDIA_AXI_ROOT>,
+                 <&clk IMX8MP_CLK_MEDIA_APB_ROOT>;
+        clock-names = "axi", "apb";
+        fsl,blk-ctrl = <&media_blk_ctrl>;
+        power-domains = <&mediamix_pd>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+                isi_in_0: endpoint {
+                    remote-endpoint = <&mipi_csi_0_out>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+                isi_in_1: endpoint {
+                    remote-endpoint = <&mipi_csi_1_out>;
+                };
+            };
+        };
+    };
+...