[PATCH v3 1/4] dt-bindings: display: Add IPK DSI subsystem bindings

[Angelo Ribeiro <Angelo.Ribeiro@synopsys.com>]

Add dt-bindings for Synopsys DesignWare MIPI DSI Host and VPG (Video
Pattern Generator) support in the IPK display subsystem.

The Synopsys DesignWare IPK display video pipeline is composed by a DSI
controller (snps,dw-ipk-dsi) and a VPG (snps,dw-ipk-vpg) as DPI
stimulus. Typically is used the Raspberry Pi
(raspberrypi,7inch-touchscreen-panel) as DSI panel that requires a
I2C controller (snps,designware-i2c).

Reported-by: Rob Herring <robh+dt@kernel.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: Angelo Ribeiro <angelo.ribeiro@synopsys.com>
---
Changes since v3:
  - Fixed dt-binding breaking on `make dt_binding_check`.

Changes since v2:
  - Fixed dt-bindings issues, see
    https://patchwork.ozlabs.org/patch/1260819/.
---
 .../bindings/display/snps,dw-ipk-dsi.yaml          | 159 +++++++++++++++++++++
 .../bindings/display/snps,dw-ipk-vpg.yaml          |  73 ++++++++++
 2 files changed, 232 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/snps,dw-ipk-dsi.yaml
 create mode 100644 Documentation/devicetree/bindings/display/snps,dw-ipk-vpg.yaml

diff --git a/Documentation/devicetree/bindings/display/snps,dw-ipk-dsi.yaml b/Documentation/devicetree/bindings/display/snps,dw-ipk-dsi.yaml
new file mode 100644
index 0000000..af4b775
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/snps,dw-ipk-dsi.yaml
@@ -0,0 +1,159 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/snps,dw-ipk-dsi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys DesignWare IPK specific extensions for the Synopsys DSI host
+       controller.
+
+maintainers:
+  - Angelo Ribeiro <angelo.ribeiro@synopsys.com>
+
+description: |
+  The Synopsys DesignWare IPK DSI controller uses the Synopsys DesignWare MIPI
+  DSI host controller.
+  For more info refer to
+  Documentation/devicetree/bindings/display/bridge/dw_mipi_dsi.txt.
+
+properties:
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  compatible:
+    items:
+      - const: snps,dw-ipk-dsi
+      - const: snps,dw-mipi-dsi
+
+  reg:
+    items:
+      - description: DW MIPI DSI Host registers
+      - description: DW MIPI DSI Phy test-chip registers
+    minItems: 2
+
+  reg-names:
+    items:
+     - const: dsi
+     - const: phy
+    minItems: 2
+
+  clocks:
+    items:
+      - description: Peripheral clock
+      - description: PLL clock
+      - description: Pixel clock
+    minItems: 2
+
+  clock-names:
+    items:
+      - const: pclk
+      - const: ref
+      - const: px_clk
+    minItems: 2
+
+  resets:
+    items:
+      - description: APB reset line
+    minItems: 1
+
+  reset-names:
+    items:
+      - const: apb
+    minItems: 1
+
+  ports:
+    type: object
+    description: |
+      A port node containging a DSI input and outuput port nodes as defined in
+      Documentation/devicetree/bindings/media/video-interfaces.txt and
+      Documentation/devicetree/bindings/graph.txt.
+    properties:
+      port@0:
+        type: object
+        description: Input endpoint of the controller, connects to a DPI source.
+
+      port@1:
+        type: object
+        description: Output endpoint of the controller, connects to a panel or
+          a bridge input port.
+
+    required:
+      - port@0
+      - port@1
+
+additionalProperties: false
+
+required:
+  - "#address-cells"
+  - "#size-cells"
+  - compatible
+  - reg
+  - reg-names
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - ports
+
+examples:
+  - |
+    dsi1: dw-ipk-dsi@2000 {
+        compatible = "snps,dw-ipk-dsi";
+        reg = <0x02000 0xfff>, <0x05000 0xfff>;
+        reg-names = "dsi", "phy";
+        clocks = <&apb_clk>, <&pll_clk>;
+        clock-names = "pclk", "ref";
+        resets = <&ipk_rst 1>;
+        reset-names = "apb";
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        ports {
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            port@0 {
+                reg = <0>;
+                dsi1_in: endpoint {
+                    remote-endpoint = <&vbridge_out>;
+                };
+            };
+
+            port@1 {
+                reg = <1>;
+                dsi_out_port: endpoint {
+                    remote-endpoint = <&panel_dsi_port>;
+                };
+            };
+        };
+    };
+
+    i2c: i2c@1000 {
+        compatible = "snps,designware-i2c";
+        reg = <0x01000 0x100>;
+        clock-frequency = <400000>;
+        clocks = <&i2cclk>;
+        interrupts = <0>;
+        resets = <&ipk_rst 0>;
+        reset-names = "i2c";
+
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        lcd@45 {
+            compatible = "raspberrypi,7inch-touchscreen-panel";
+            reg = <0x45>;
+
+            port {
+                panel_dsi_port: endpoint {
+                    remote-endpoint = <&dsi_out_port>;
+                };
+            };
+        };
+    };
+
+...
diff --git a/Documentation/devicetree/bindings/display/snps,dw-ipk-vpg.yaml b/Documentation/devicetree/bindings/display/snps,dw-ipk-vpg.yaml
new file mode 100644
index 0000000..07e8380
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/snps,dw-ipk-vpg.yaml
@@ -0,0 +1,73 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/snps,dw-ipk-vpg.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Synopsys DesignWare Video Pattern Generator (VPG) for MIPI DSI HOST
+
+maintainers:
+  - Angelo Ribeiro <angelo.ribeiro@synopsys.com>
+
+properties:
+  compatible:
+    const: snps,dw-ipk-vpg
+
+  reg:
+    items:
+      - description: Video Pattern Generator (VPG) registers
+      - description: Clock generator (MMCM) registers
+    minItems: 2
+
+  reg-names:
+   items:
+     - const: vpg
+     - const: mmcm
+   minItems: 2
+
+  resets:
+    items:
+      - description: VPG reset line
+      - description: MMCM reset line
+    minItems: 2
+
+  reset-names:
+    items:
+      - const: vpg
+      - const: mmcm
+    minItems: 2
+
+  port:
+    type: object
+    description: Video port for DPI output.
+      The VPG has one video port for internal DPI stimulus over the MIPI
+      DSI host controller.
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - resets
+  - reset-names
+  - port
+
+additionalProperties: false
+
+examples:
+  - |
+    dsi_vpg: dw-dsi-vpg@3000 {
+        compatible = "snps,dw-ipk-vpg";
+        reg = <0x03000 0xfff>, <0x07000 0xfff>;
+        reg-names = "vpg", "mmcm";
+        resets = <&ipk_rst 2>, <&ipk_rst 3>;
+        reset-names = "vpg", "mmcm";
+        status = "okay";
+
+        port {
+            vpg_out: endpoint {
+                remote-endpoint = <&dsi1_in>;
+            };
+        };
+    };
+
+...
-- 
2.7.4