tests: i2c: add support for i2c sci-b on Renesas RA boards

Add Renesas RA board support for i2c test use sci_b_i2c:
- tests/drivers/i2c/i2c_api

Example for i2c use sci_b_i2c:

west build -b ek_ra8m1 tests/drivers/i2c/i2c_api/ -p always \
 -DDTC_OVERLAY_FILE=boards/ek_ra8m1_sci_b_i2c.overlay \
 -DCONF_FILE="boards/ek_ra8m1_sci_b_i2c.conf"

Signed-off-by: Khoa Tran <khoa.tran.yj@bp.renesas.com>
Signed-off-by: Thao Luong <thao.luong.uw@renesas.com>

Author: Khoa Tran

tests/drivers/i2c/i2c_api/boards/ek_ra8d1_sci_b_i2c.conf

@@ -0,0 +1,3 @@
+CONFIG_I2C=y
+CONFIG_ZTEST=y
+CONFIG_SENSOR_GY271_QMC=y

tests/drivers/i2c/i2c_api/boards/ek_ra8d1_sci_b_i2c.overlay

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		i2c-0 = &i2c4;
+		gy271 = &i2c4;
+	};
+};
+
+&sci4 {
+	status = "okay";
+
+	i2c4: i2c {
+		status = "okay";
+	};
+};

tests/drivers/i2c/i2c_api/boards/ek_ra8m1_sci_b_i2c.conf

@@ -0,0 +1,3 @@
+CONFIG_I2C=y
+CONFIG_ZTEST=y
+CONFIG_SENSOR_GY271_QMC=y

tests/drivers/i2c/i2c_api/boards/ek_ra8m1_sci_b_i2c.overlay

@@ -0,0 +1,19 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		i2c-0 = &i2c1;
+		gy271 = &i2c1;
+	};
+};
+
+&sci1 {
+	status = "okay";
+
+	i2c1: i2c {
+		status = "okay";
+	};
+};

tests/drivers/i2c/i2c_api/boards/mck_ra8t1_sci_b_i2c.conf

@@ -0,0 +1,3 @@
+CONFIG_I2C=y
+CONFIG_ZTEST=y
+CONFIG_SENSOR_GY271_QMC=y

tests/drivers/i2c/i2c_api/boards/mck_ra8t1_sci_b_i2c.overlay

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2025 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		i2c-0 = &i2c9;
+		gy271 = &i2c9;
+
+	};
+};
+
+&sci9 {
+	status = "okay";
+
+	i2c9: i2c {
+		status = "okay";
+		sda-output-delay = <250>;
+	};
+};

tests/drivers/i2c/i2c_api/testcase.yaml

@@ -5,3 +5,16 @@ tests:
       - drivers
       - i2c
     filter: dt_alias_exists("gy271")
+  drivers.i2c.renesas_sci_b_i2c.api:
+    depends_on: i2c
+    tags:
+      - drivers
+      - i2c
+    filter: dt_alias_exists("gy271") and CONFIG_I2C_RENESAS_RA_SCI_B
+    platform_allow:
+      - ek_ra8m1
+      - ek_ra8d1
+      - mck_ra8t1
+    extra_args:
+      - DTC_OVERLAY_FILE="./boards/${BOARD}_sci_b_i2c.overlay"
+      - CONF_FILE="./prj.conf ./boards/${BOARD}_sci_b_i2c.conf"