[PATCH 1/2] dt-bindings: display: mayqueen,pixpaper: add pixpaper-426m

[LiangCheng Wang <zaq14760@gmail.com>]

Add the compatible string for the PIXPAPER 4.26 monochrome
e-ink panel to the Mayqueen Pixpaper binding.

The new panel uses the same SPI and GPIO control interface as
the existing Pixpaper panel, so extend the existing binding
instead of adding a separate schema. Document the new compatible
string and add an example node for pixpaper-426m.

Signed-off-by: LiangCheng Wang <zaq14760@gmail.com>
---
 .../bindings/display/mayqueen,pixpaper.yaml        | 25 +++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/Documentation/devicetree/bindings/display/mayqueen,pixpaper.yaml b/Documentation/devicetree/bindings/display/mayqueen,pixpaper.yaml
index cd27f8ba5ae1d94660818525b5fa71db98c8acb7..4b0db2b079ebea244eb149a52ee1d8dbab0f60bb 100644
--- a/Documentation/devicetree/bindings/display/mayqueen,pixpaper.yaml
+++ b/Documentation/devicetree/bindings/display/mayqueen,pixpaper.yaml
@@ -4,22 +4,23 @@
 $id: http://devicetree.org/schemas/display/mayqueen,pixpaper.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
-title: Mayqueen Pixpaper e-ink display panel
+title: Mayqueen Pixpaper e-ink display panels
 
 maintainers:
   - LiangCheng Wang <zaq14760@gmail.com>
 
 description:
-  The Pixpaper is an e-ink display panel controlled via an SPI interface.
-  The panel has a resolution of 122x250 pixels and requires GPIO pins for
-  reset, busy, and data/command control.
+  Mayqueen Pixpaper e-ink display panels are controlled via an SPI interface
+  and require GPIO pins for reset, busy, and data/command control.
 
 allOf:
   - $ref: /schemas/spi/spi-peripheral-props.yaml#
 
 properties:
   compatible:
-    const: mayqueen,pixpaper
+    enum:
+      - mayqueen,pixpaper
+      - mayqueen,pixpaper-426m
 
   reg:
     maxItems: 1
@@ -61,3 +62,17 @@ examples:
             dc-gpios = <&gpio1 19 GPIO_ACTIVE_HIGH>;
         };
     };
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        display@0 {
+            compatible = "mayqueen,pixpaper-426m";
+            reg = <0>;
+            spi-max-frequency = <1000000>;
+            reset-gpios = <&gpio1 17 GPIO_ACTIVE_HIGH>;
+            busy-gpios = <&gpio1 18 GPIO_ACTIVE_HIGH>;
+            dc-gpios = <&gpio1 19 GPIO_ACTIVE_HIGH>;
+        };
+    };

-- 
2.34.1