Convert mt9p031 sensor bindings to yaml schema. Also update the
MAINTAINERS entry.

Although input-clock-frequency and pixel-clock-frequency have not been
definded as endpoint propierties in the textual bindings, the sensor
does parse them from the endpoint. Thus move these properties to the
endpoint in the new yaml bindings.

Signed-off-by: Stefan Riedmueller <redacted>
---
 .../bindings/media/i2c/aptina,mt9p031.yaml    | 92 +++++++++++++++++++
 .../devicetree/bindings/media/i2c/mt9p031.txt | 40 --------
 MAINTAINERS                                   |  1 +
 3 files changed, 93 insertions(+), 40 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/media/i2c/aptina,mt9p031.yaml
 delete mode 100644 Documentation/devicetree/bindings/media/i2c/mt9p031.txt

diff --git a/Documentation/devicetree/bindings/media/i2c/aptina,mt9p031.yaml b/Documentation/devicetree/bindings/media/i2c/aptina,mt9p031.yaml
new file mode 100644
index 000000000000..1531ecd1ed95
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/aptina,mt9p031.yaml

@@ -0,0 +1,92 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/media/i2c/aptina,mt9p031.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Aptina 1/2.5-Inch 5Mp CMOS Digital Image Sensor
+
+maintainers:
+  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+
+description: |
+  The Aptina MT9P031 is a 1/2.5-inch CMOS active pixel digital image sensor
+  with an active array size of 2592H x 1944V. It is programmable through a
+  simple two-wire serial interface.
+
+properties:
+  compatible:
+    enum:
+      - aptina,mt9p031
+      - aptina,mt9p031m
+
+  reg:
+    description: I2C device address
+    maxItems: 1
+
+  reset-gpios:
+    maxItems: 1
+    description: Chip reset GPIO
+
+  port:
+    $ref: /schemas/graph.yaml#/$defs/port-base
+    additionalProperties: false
+
+    properties:
+      endpoint:
+        $ref: /schemas/media/video-interfaces.yaml#
+        unevaluatedProperties: false
+
+        properties:
+          input-clock-frequency:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            minimum: 6000000
+            maximum: 96000000
+            description: Input clock frequency
+
+          pixel-clock-frequency:
+            $ref: /schemas/types.yaml#/definitions/uint32
+            maximum: 96000000
+            description: Target pixel clock frequency
+
+          bus-type:
+            const: 5
+
+          bus-width:
+            const: 12