[PATCH 1/2] dt-bindings: add vendor-prefixes and bindings for pcd8544 displays

[Viktar Simanenka]

On 2023-07-18 08:35, Krzysztof Kozlowski wrote:
> Bindings are always separate patches.
> Please run scripts/checkpatch.pl and fix reported warnings.

Added vendor-prefix to fix warning.

> > + inverted:
> > +    maxItems: 1
> > +    description: Invert display colors
> You described the desired Linux feature or behavior, not the actual
> hardware. The bindings are about the latter, so instead you need to
> rephrase the property and its description to match actual hardware
> capabilities/features/configuration etc.

revised the descriptions and added suitable types according to the
documentation

> Please run `make dt_binding_check` (see
> Documentation/devicetree/bindings/writing-schema.rst for instructions).
> Maybe you need to update your dtschema and yamllint.

cleaned up unneccessary fields (leftovers) from tested binding

On 2023-07-18 9:19, Rob Herring wrote:
> If you already ran 'make dt_binding_check' and didn't see the above
> error(s), then make sure 'yamllint' is installed and dt-schema is up to
> date
> Please check and re-submit after running the above command yourself.

upgraded dtschema and found all the warnings. thanks. seems to be fixed

Signed-off-by: Viktar Simanenka <viteosen at gmail.com>
---
 .../bindings/display/philips,pcd8544.yaml     | 89 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
 2 files changed, 91 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/philips,pcd8544.yaml

diff --git a/Documentation/devicetree/bindings/display/philips,pcd8544.yaml b/Documentation/devicetree/bindings/display/philips,pcd8544.yaml
new file mode 100644
index 000000000000..ac880d9d8cc1
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/philips,pcd8544.yaml
@@ -0,0 +1,89 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/philips,pcd8544.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Philips PCD8544 LCD Display Controller
+
+maintainers:
+  - Viktar Simanenka <viteosen at gmail.com>
+
+description: |
+  Philips PCD8544 LCD Display Controller with SPI control bus.
+  Monochrome 84x48 LCD displays, such as Nokia 5110/3310 LCDs.
+  May contain backlight LED.
+
+allOf:
+  - $ref: panel/panel-common.yaml#
+  - $ref: /schemas/spi/spi-peripheral-props.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - philips,pcd8544
+
+  dc-gpios:
+    maxItems: 1
+    description: Data/Command selection pin (D/CX)
+
+  reset-gpios:
+    maxItems: 1
+    description: Display Reset pin (RST)
+
+  philips,inverted:
+    type: boolean
+    description: Display color inversion
+
+  philips,voltage-op:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 127
+    description: Display liquid crystal operation voltage
+
+  philips,bias:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 7
+    description: Display bias voltage system value
+
+  philips,temperature-coeff:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    minimum: 0
+    maximum: 3
+    description: Display temperature compensation coefficient
+
+required:
+  - compatible
+  - reg
+  - dc-gpios
+  - reset-gpios
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        display at 0 {
+            compatible = "philips,pcd8544";
+            spi-max-frequency = <8000000>;
+            reg = <0>;
+
+            dc-gpios = <&pio 0 3 GPIO_ACTIVE_HIGH>; /* DC=PA3 */
+            reset-gpios = <&pio 0 1 GPIO_ACTIVE_HIGH>; /* RESET=PA1 */
+            backlight = <&backlight>;
+
+            philips,inverted;
+            philips,voltage-op = <0>;
+            philips,bias = <4>;
+            philips,temperature-coeff = <0>;
+        };
+    };
+
+...
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index af60bf1a6664..0c3844af6776 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -1037,6 +1037,8 @@ patternProperties:
     description: Pervasive Displays, Inc.
   "^phicomm,.*":
     description: PHICOMM Co., Ltd.
+  "^philips,.*":
+    description: Koninklijke Philips N.V.
   "^phytec,.*":
     description: PHYTEC Messtechnik GmbH
   "^picochip,.*":
-- 
2.34.1