[PATCH v1 2/4] dt-bindings: display: convert atmel lcdc to DT Schema

[Sam Ravnborg <sam@ravnborg.org>]

Add a new binding file to describe the bindings
for the Atmel LCDC IP.
This replaces the old txt based binding.

The binding file describes the current binding,
including properties to specify register values etc.
The binding will be updated in a follow-up patch,
the current binding describes the actual situation.

This new binding file replaces the old .txt based
binding which is deleted.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
---
 .../bindings/display/atmel,lcdc.txt           |  88 -----------
 .../bindings/display/atmel/lcdc.yaml          | 137 ++++++++++++++++++
 2 files changed, 137 insertions(+), 88 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/display/atmel,lcdc.txt
 create mode 100644 Documentation/devicetree/bindings/display/atmel/lcdc.yaml

diff --git a/Documentation/devicetree/bindings/display/atmel,lcdc.txt b/Documentation/devicetree/bindings/display/atmel,lcdc.txt
deleted file mode 100644
index acb5a0132127..000000000000
--- a/Documentation/devicetree/bindings/display/atmel,lcdc.txt
+++ /dev/null
@@ -1,88 +0,0 @@
-Atmel LCDC Framebuffer
------------------------------------------------------
-
-Required properties:
-- compatible :
-	"atmel,at91sam9261-lcdc" , 
-	"atmel,at91sam9263-lcdc" ,
-	"atmel,at91sam9g10-lcdc" ,
-	"atmel,at91sam9g45-lcdc" ,
-	"atmel,at91sam9g45es-lcdc" ,
-	"atmel,at91sam9rl-lcdc" ,
-	"atmel,at32ap-lcdc"
-- reg : Should contain 1 register ranges(address and length).
-	Can contain an additional register range(address and length)
-	for fixed framebuffer memory. Useful for dedicated memories.
-- interrupts : framebuffer controller interrupt
-- display: a phandle pointing to the display node
-
-Required nodes:
-- display: a display node is required to initialize the lcd panel
-	This should be in the board dts.
-- default-mode: a videomode within the display with timing parameters
-	as specified below.
-
-Optional properties:
-- lcd-supply: Regulator for LCD supply voltage.
-
-Example:
-
-	fb0: fb@00500000 {
-		compatible = "atmel,at91sam9g45-lcdc";
-		reg = <0x00500000 0x1000>;
-		interrupts = <23 3 0>;
-		pinctrl-names = "default";
-		pinctrl-0 = <&pinctrl_fb>;
-		display = <&display0>;
-		#address-cells = <1>;
-		#size-cells = <1>;
-
-	};
-
-Example for fixed framebuffer memory:
-
-	fb0: fb@00500000 {
-		compatible = "atmel,at91sam9263-lcdc";
-		reg = <0x00700000 0x1000 0x70000000 0x200000>;
-		[...]
-	};
-
-Atmel LCDC Display
------------------------------------------------------
-Required properties (as per of_videomode_helper):
-
- - atmel,dmacon: dma controller configuration
- - atmel,lcdcon2: lcd controller configuration
- - atmel,guard-time: lcd guard time (Delay in frame periods)
- - bits-per-pixel: lcd panel bit-depth.
-
-Optional properties (as per of_videomode_helper):
- - atmel,lcdcon-backlight: enable backlight
- - atmel,lcdcon-backlight-inverted: invert backlight PWM polarity
- - atmel,lcd-wiring-mode: lcd wiring mode "RGB" or "BRG"
- - atmel,power-control-gpio: gpio to power on or off the LCD (as many as needed)
-
-Example:
-	display0: display {
-		bits-per-pixel = <32>;
-		atmel,lcdcon-backlight;
-		atmel,dmacon = <0x1>;
-		atmel,lcdcon2 = <0x80008002>;
-		atmel,guard-time = <9>;
-		atmel,lcd-wiring-mode = <1>;
-
-		display-timings {
-			native-mode = <&timing0>;
-			timing0: timing0 {
-				clock-frequency = <9000000>;
-				hactive = <480>;
-				vactive = <272>;
-				hback-porch = <1>;
-				hfront-porch = <1>;
-				vback-porch = <40>;
-				vfront-porch = <1>;
-				hsync-len = <45>;
-				vsync-len = <1>;
-			};
-		};
-	};
diff --git a/Documentation/devicetree/bindings/display/atmel/lcdc.yaml b/Documentation/devicetree/bindings/display/atmel/lcdc.yaml
new file mode 100644
index 000000000000..7dcb9a4d5902
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/atmel/lcdc.yaml
@@ -0,0 +1,137 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/atmel/lcdc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Atmel LCDC (LCD Controller) display controller with PWM
+
+maintainers:
+  - Sam Ravnborg <sam@ravnborg.org>
+
+description: |
+  The Atmel LCDC Display Controller is display controller that
+  includes a PWM for backlight/contrast.
+
+properties:
+  compatible:
+    enum:
+      - atmel,at91sam9261-lcdc
+      - atmel,at91sam9263-lcdc
+      - atmel,at91sam9g10-lcdc
+      - atmel,at91sam9g45-lcdc
+      - atmel,at91sam9g45es-lcdc
+      - atmel,at91sam9g46-lcdc
+      - atmel,at91sam9m10-lcdc
+      - atmel,at91sam9m11-lcdc
+      - atmel,at91sam9rl-lcdc
+
+  "#address-cells":
+    const: 1
+  "#size-cells":
+    const: 0
+
+  reg:
+    description: |
+      Contains 1 register range (address and length).
+      Can contain an additional register range (address and length)
+      for fixed framebuffer memory
+
+  interrupts:
+    maxItems: 1
+
+  lcd-supply:
+    description: Regulator for LCD supply voltage.
+
+  display:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: phandle to display node
+
+patternProperties:
+  "^display[0-9]$":
+    type: object
+    description: |
+      Display node is required to initialize the lcd panel.
+      This should be in the board dts
+
+    properties:
+            
+      atmel,dmacon:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: DMA controller configuration
+
+      atmel,lcdcon2:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: LCD controller configuration
+
+      atmel,guard-time:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: LCD guard time (Delay in frame periods)
+
+      bits-per-pixel:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: LCD panel bit-depth.
+
+      atmel,lcdcon-backlight:
+        type: boolean
+        description: Enable backlight
+
+      atmel,lcdcon-backlight-inverted:
+        type: boolean
+        description: Invert backlight PWM polarity
+
+      atmel,lcd-wiring-mode:
+        enum:
+          - RGB
+          - BGR
+        description: LCD wiring mode
+
+      atmel,power-control-gpio:
+        description: gpio to power on or off the LCD
+
+      display-timings:
+        type: object
+        description: |
+          display-timings node as described in ../display-timings.yaml
+
+    required:
+      - atmel,dmacon
+      - atmel,lcdcon2
+      - atmel,guard-time
+      - bits-per-pixel
+      - display-timings
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    fb {
+        compatible = "atmel,at91sam9263-lcdc";
+        reg = <0x00700000 0x1000>;
+        interrupts = <23 3 0>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };
+
+  - |
+    fb {
+        compatible = "atmel,at91sam9263-lcdc";
+        reg = <0x00700000 0x1000 0x70000000 0x200000>;
+        display = <&display0>;
+
+        display0 {
+            bits-per-pixel = <32>;
+            atmel,lcdcon-backlight;
+            atmel,dmacon = <0x1>;
+            atmel,lcdcon2 = <0x80008002>;
+            atmel,guard-time = <9>;
+            atmel,lcd-wiring-mode = "BGR";
+
+            display-timings {
+            };
+        };
+    };
+
+...
-- 
2.20.1