[PATCH 1/3] dt-bindings: media: Add Allwinner D1 CSIC

[Nguyen Minh Tien <tien.nguyenminh@embeddedlinux.blog>]

Add a binding for the camera interface (CSIC) of the Allwinner D1, D1s
and T113. It is not the A31 CSI: its parser and DMA engines are separate
blocks. Only the 8-bit parallel input is pinned out on these SoCs.

Signed-off-by: Nguyen Minh Tien <tien.nguyenminh@embeddedlinux.blog>
---
 .../media/allwinner,sun20i-d1-csi.yaml        | 111 ++++++++++++++++++
 MAINTAINERS                                   |   7 ++
 2 files changed, 118 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/media/allwinner,sun20i-d1-csi.yaml

diff --git a/Documentation/devicetree/bindings/media/allwinner,sun20i-d1-csi.yaml b/Documentation/devicetree/bindings/media/allwinner,sun20i-d1-csi.yaml
new file mode 100644
index 0000000000..2bfe2cc9af
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/allwinner,sun20i-d1-csi.yaml
@@ -0,0 +1,111 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/allwinner,sun20i-d1-csi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Allwinner D1 CMOS Sensor Interface Controller (CSIC)
+
+maintainers:
+  - Nguyen Minh Tien <tien.nguyenminh@embeddedlinux.blog>
+
+description:
+  The CSIC found in the Allwinner D1, D1s and T113 receives video from a
+  parallel camera interface and writes it to memory. It contains a parser for
+  the camera bus and two DMA engines.
+
+properties:
+  compatible:
+    const: allwinner,sun20i-d1-csi
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: DMA engine 0
+      - description: DMA engine 1
+      - description: Parser 0
+      - description: Top-level block (CSI_TOP_PKT)
+
+  clocks:
+    items:
+      - description: Bus clock
+      - description: Module clock
+      - description: DRAM clock
+
+  clock-names:
+    items:
+      - const: bus
+      - const: mod
+      - const: ram
+
+  resets:
+    maxItems: 1
+
+  iommus:
+    maxItems: 1
+
+  port:
+    $ref: /schemas/graph.yaml#/$defs/port-base
+    description: Parallel input port, connect to a parallel sensor
+    unevaluatedProperties: false
+
+    properties:
+      endpoint:
+        $ref: video-interfaces.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          bus-width:
+            const: 8
+
+          pclk-sample: true
+          hsync-active: true
+          vsync-active: true
+
+        required:
+          - bus-width
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - resets
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/sun20i-d1-ccu.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+    #include <dt-bindings/reset/sun20i-d1-ccu.h>
+
+    csi@5800000 {
+        compatible = "allwinner,sun20i-d1-csi";
+        reg = <0x05800000 0x400000>;
+        interrupts = <111 IRQ_TYPE_LEVEL_HIGH>,
+                     <112 IRQ_TYPE_LEVEL_HIGH>,
+                     <116 IRQ_TYPE_LEVEL_HIGH>,
+                     <122 IRQ_TYPE_LEVEL_HIGH>;
+        clocks = <&ccu CLK_BUS_CSI>,
+                 <&ccu CLK_CSI_TOP>,
+                 <&ccu CLK_MBUS_CSI>;
+        clock-names = "bus", "mod", "ram";
+        resets = <&ccu RST_BUS_CSI>;
+
+        port {
+            endpoint {
+                remote-endpoint = <&ov5640_ep>;
+                bus-width = <8>;
+                hsync-active = <1>; /* Active high */
+                vsync-active = <0>; /* Active low */
+                pclk-sample = <1>;  /* Rising */
+            };
+        };
+    };
+
+...
diff --git a/MAINTAINERS b/MAINTAINERS
index f5eff489a8..f4c45c4678 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -905,6 +905,13 @@ L:	linux-crypto@vger.kernel.org
 S:	Maintained
 F:	drivers/crypto/allwinner/
 
+ALLWINNER D1 CSIC DRIVER
+M:	Nguyen Minh Tien <tien.nguyenminh@embeddedlinux.blog>
+L:	linux-media@vger.kernel.org
+S:	Maintained
+T:	git git://linuxtv.org/media.git
+F:	Documentation/devicetree/bindings/media/allwinner,sun20i-d1-csi.yaml
+
 ALLWINNER DMIC DRIVERS
 M:	Ban Tao <fengzheng923@gmail.com>
 L:	linux-sound@vger.kernel.org
-- 
2.34.1