dts: bindings: addition of CSI 22 pins camera connector

Add CSI 22 pins camera connector description.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>

Author: Alain Volmat

dts/bindings/gpio/csi,cam-22pins-connector.yaml

@@ -0,0 +1,34 @@
+# Copyright 2025 STMicroelectronics
+# SPDX-License-Identifier: Apache-2.0
+
+description: |
+  GPIO pins exposed on the CSI 22pins Camera connector found on
+  various devices such as Raspberry Pi and STM32.
+  Connector layout:
+
+    1	GND
+    2	CSI_D0_N
+    3	CSI_D0_P
+    4	GND
+    5	CSI_D1_N
+    6	CSI_D1_P
+    7	GND
+    8	CSI_CK_N
+    9	CSI_CK_P
+    10	GND
+    11	CSI_D2_N
+    12	CSI_D2_P
+    13	GND
+    14	CSI_D3_N
+    15	CSI_D3_P
+    16	GND
+    17	IO0
+    18	IO1
+    19	GND
+    20	I2C_SCL
+    21	I2C_SDA
+    22	VCC (3v3)
+
+compatible: "csi,cam-22pins-connector"
+
+include: [gpio-nexus.yaml, base.yaml]

include/zephyr/dt-bindings/gpio/csi-22pins-connector.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2025 STMicroelectronics
+ * SPDX-License-Identifier: Apache-2.0
+ */
+#ifndef INCLUDE_ZEPHYR_DT_BINDINGS_GPIO_CSI_22PINS_CONNECTOR_H_
+#define INCLUDE_ZEPHYR_DT_BINDINGS_GPIO_CSI_22PINS_CONNECTOR_H_
+
+/**
+ * @name CSI 22 pins camera connector pinout
+ * @{
+ */
+#define CSI_22PINS_IO0		17	/**< GPIO0 */
+#define CSI_22PINS_IO1		18	/**< GPIO1 */
+#define CSI_22PINS_I2C_SCL	20	/**< I2C clock pin */
+#define CSI_22PINS_I2C_SDA	21	/**< I2C data pin */
+/** @} */
+
+#endif /* INCLUDE_ZEPHYR_DT_BINDINGS_GPIO_CSI_22PINS_CONNECTOR_H_ */