[PATCH v4 5/6] dt-bindings: display: Split common Solomon properties in their own schema

[Javier Martinez Canillas <javierm@redhat.com>]

There are DT properties that can be shared across different Solomon OLED
Display Controller families. Split them into a separate common schema to
avoid these properties to be duplicated in different DT bindings schemas.

Suggested-by: Rob Herring <robh@kernel.org>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
---

(no changes since v3)

Changes in v3:
- Fix "No newline at end of file" in solomon,ssd-common.yaml (Rob Herring).
- Add Rob Herring's Reviewed-by tag to patch #5.

 .../bindings/display/solomon,ssd-common.yaml  | 42 +++++++++++++++++++
 .../bindings/display/solomon,ssd1307fb.yaml   | 28 +------------
 MAINTAINERS                                   |  1 +
 3 files changed, 44 insertions(+), 27 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/solomon,ssd-common.yaml

diff --git a/Documentation/devicetree/bindings/display/solomon,ssd-common.yaml b/Documentation/devicetree/bindings/display/solomon,ssd-common.yaml
new file mode 100644
index 000000000000..3e6998481a75
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/solomon,ssd-common.yaml
@@ -0,0 +1,42 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/solomon,ssd-common.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Common properties for Solomon OLED Display Controllers
+
+maintainers:
+  - Javier Martinez Canillas <javierm@redhat.com>
+
+properties:
+  reg:
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+
+  # Only required for SPI
+  dc-gpios:
+    description:
+      GPIO connected to the controller's D/C# (Data/Command) pin,
+      that is needed for 4-wire SPI to tell the controller if the
+      data sent is for a command register or the display data RAM
+    maxItems: 1
+
+  solomon,height:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Height in pixel of the screen driven by the controller.
+      The default value is controller-dependent.
+
+  solomon,width:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Width in pixel of the screen driven by the controller.
+      The default value is controller-dependent.
+
+allOf:
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+additionalProperties: true
diff --git a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
index 20e2bd15d4d2..3afbb52d1b7f 100644
--- a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
+++ b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
@@ -27,38 +27,12 @@ properties:
           - solomon,ssd1307
           - solomon,ssd1309
 
-  reg:
-    maxItems: 1
-
   pwms:
     maxItems: 1
 
-  reset-gpios:
-    maxItems: 1
-
-  # Only required for SPI
-  dc-gpios:
-    description:
-      GPIO connected to the controller's D/C# (Data/Command) pin,
-      that is needed for 4-wire SPI to tell the controller if the
-      data sent is for a command register or the display data RAM
-    maxItems: 1
-
   vbat-supply:
     description: The supply for VBAT
 
-  solomon,height:
-    $ref: /schemas/types.yaml#/definitions/uint32
-    description:
-      Height in pixel of the screen driven by the controller.
-      The default value is controller-dependent.
-
-  solomon,width:
-    $ref: /schemas/types.yaml#/definitions/uint32
-    description:
-      Width in pixel of the screen driven by the controller.
-      The default value is controller-dependent.
-
   solomon,page-offset:
     $ref: /schemas/types.yaml#/definitions/uint32
     default: 1
@@ -148,7 +122,7 @@ required:
   - reg
 
 allOf:
-  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+  - $ref: solomon,ssd-common.yaml#
 
   - if:
       properties:
diff --git a/MAINTAINERS b/MAINTAINERS
index 987152e3be02..c63649e9ba58 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6765,6 +6765,7 @@ DRM DRIVER FOR SOLOMON SSD130X OLED DISPLAYS
 M:	Javier Martinez Canillas <javierm@redhat.com>
 S:	Maintained
 T:	git git://anongit.freedesktop.org/drm/drm-misc
+F:	Documentation/devicetree/bindings/display/solomon,ssd-common.yaml
 F:	Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
 F:	drivers/gpu/drm/solomon/ssd130x*
 
-- 
2.41.0