diff --git a/samples/drivers/spi_bitbang/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.conf b/samples/drivers/spi_bitbang/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.conf
new file mode 100644
index 00000000000..1dd585f098f
--- /dev/null
+++ b/samples/drivers/spi_bitbang/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.conf
@@ -0,0 +1,3 @@
+CONFIG_GPIO=y
+CONFIG_SPI_RENESAS_RZ_RSPI_DMAC=n
+CONFIG_NO_OPTIMIZATIONS=y
diff --git a/samples/drivers/spi_bitbang/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.overlay b/samples/drivers/spi_bitbang/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.overlay
new file mode 100644
index 00000000000..ee53d40f740
--- /dev/null
+++ b/samples/drivers/spi_bitbang/boards/rzg3s_smarc_r9a08g045s33gbg_cm33.overlay
@@ -0,0 +1,13 @@
+/*
+ * Copyright (c) 2024 Renesas Electronics Corporation
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+spibb0: &spi0 {
+	cs-gpios = <&gpio0 1 GPIO_ACTIVE_LOW>;
+	status = "okay";
+};
+
+&gpio0 {
+	status = "okay";
+};