[PATCH v4 1/2] dt-bindings: display: himax,hx8837: Add Himax HX8837 bindings

[Lubomir Rintel <lkundrak@v3.sk>]

Himax HX8837 is a secondary display controller used to drive the panel
on OLPC platforms.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

---
Changes since v3:
- Moved to bindings/display/
- Added the ports
- Converted to YAML
- Removed Pavel's Ack, because the changes are substantial

Changes since v2:
- s/betweend/between/

Changes since v1:
- s/load-gpio/load-gpios/
- Use interrupt bindings instead of gpio for the IRQ

 .../bindings/display/bridge/himax,hx8837.yaml | 96 +++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/himax,hx8837.yaml

diff --git a/Documentation/devicetree/bindings/display/bridge/himax,hx8837.yaml b/Documentation/devicetree/bindings/display/bridge/himax,hx8837.yaml
new file mode 100644
index 0000000000000..f5b0a00f5089d
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/bridge/himax,hx8837.yaml
@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (C) 2018,2019,2020 Lubomir Rintel <lkundrak@v3.sk>
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/bridge/himax,hx8837.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: HX8837 Display Controller Device Tree Bindings
+
+maintainers:
+  - Lubomir Rintel <lkundrak@v3.sk>
+
+properties:
+  compatible:
+    const: himax,hx8837
+
+  reg:
+    const: 0xd
+
+  load-gpios:
+    maxItems: 1
+    description: GPIO specifier of DCON_LOAD pin (active high)
+
+  stat-gpios:
+    minItems: 2
+    description: GPIO specifier of DCON_STAT0 and DCON_STAT1 pins (active high)
+
+  interrupts:
+    maxItems: 1
+    description: Interrupt specifier of DCON_IRQ pin (edge falling)
+
+  ports:
+    type: object
+
+    properties:
+      port@0:
+        type: object
+        description: |
+          Video port for RGB input.
+
+      port@1:
+        type: object
+        description: |
+          Video port connected to the panel.
+
+    required:
+      - port@0
+      - port@1
+
+required:
+  - compatible
+  - reg
+  - load-gpios
+  - stat-gpios
+  - interrupts
+  - ports
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        
+        lcd-controller@d {
+            compatible = "himax,hx8837";
+            reg = <0x0d>;
+            stat-gpios = <&gpio 100 GPIO_ACTIVE_HIGH>,
+                         <&gpio 101 GPIO_ACTIVE_HIGH>;
+            load-gpios = <&gpio 142 GPIO_ACTIVE_HIGH>;
+            interrupts = <&gpio 124 IRQ_TYPE_EDGE_FALLING>;
+    
+            ports {
+                #address-cells = <0x01>;
+                #size-cells = <0x00>;
+    
+                port@0 {
+                    reg = <0x00>;
+                    dcon_rgb_in: endpoint {
+                        remote-endpoint = <&lcd0_rgb_out>;
+                    };
+                };
+    
+                port@1 {
+                    reg = <0x01>;
+                    dcon_gettl_out: endpoint {
+                        remote-endpoint = <&panel_dettl_in>;
+                    };
+                };
+            };
+        };
+    };
-- 
2.26.2