samples: drivers: i2c: rtio_loopback: Enable sample on nrf54lm20dk

Add overlay required to run the sample on
nrf54lm20dk/nrf54lm20a/cpuapp.

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

samples/drivers/i2c/rtio_loopback/boards/nrf54lm20dk_nrf54lm20a_cpuapp.conf

@@ -0,0 +1,4 @@
+# Copyright (c) 2025 Nordic Semiconductor ASA
+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_I2C_NRFX_TWIS_BUF_SIZE=256

samples/drivers/i2c/rtio_loopback/boards/nrf54lm20dk_nrf54lm20a_cpuapp.overlay

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * SDA = P1.13 and P1.14
+ * SCL = P1.23 and P1.24
+ */
+
+/ {
+	aliases {
+		i2c-controller = &i2c21;
+		i2c-controller-target = &i2c22;
+	};
+};
+
+&pinctrl {
+	i2c21_default: i2c21_default {
+		group1 {
+			psels = <NRF_PSEL(TWIS_SDA, 1, 13)>,
+				<NRF_PSEL(TWIS_SCL, 1, 23)>;
+			bias-pull-up;
+		};
+	};
+
+	i2c21_sleep: i2c21_sleep {
+		group1 {
+			psels = <NRF_PSEL(TWIS_SDA, 1, 13)>,
+				<NRF_PSEL(TWIS_SCL, 1, 23)>;
+			low-power-enable;
+		};
+	};
+
+	i2c22_default: i2c22_default {
+		group1 {
+			psels = <NRF_PSEL(TWIS_SDA, 1, 14)>,
+				<NRF_PSEL(TWIS_SCL, 1, 24)>;
+			bias-pull-up;
+		};
+	};
+
+	i2c22_sleep: i2c22_sleep {
+		group1 {
+			psels = <NRF_PSEL(TWIS_SDA, 1, 14)>,
+				<NRF_PSEL(TWIS_SCL, 1, 24)>;
+			low-power-enable;
+		};
+	};
+};
+
+&i2c21 {
+	pinctrl-0 = <&i2c21_default>;
+	pinctrl-1 = <&i2c21_sleep>;
+	pinctrl-names = "default", "sleep";
+	zephyr,concat-buf-size = <256>;
+	status = "okay";
+};
+
+&i2c22 {
+	compatible = "nordic,nrf-twis";
+	pinctrl-0 = <&i2c22_default>;
+	pinctrl-1 = <&i2c22_sleep>;
+	pinctrl-names = "default", "sleep";
+	status = "okay";
+};

samples/drivers/i2c/rtio_loopback/sample.yaml

@@ -14,8 +14,9 @@ tests:
     platform_allow:
       - b_u585i_iot02a
       - nrf5340dk/nrf5340/cpuapp
-      - nrf54l15dk/nrf54l15/cpuapp
       - nrf54h20dk/nrf54h20/cpuapp
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54lm20dk/nrf54lm20a/cpuapp
       - nucleo_f401re
       - nucleo_h503rb
       - ophelia4ev/nrf54l15/cpuapp