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driver: Add Zephyr modem driver for Serial Modem 2.0
Add Zephyr modem driver for Serial Modem 2.0, including the nRF91M1 module. Signed-off-by: Seppo Takalo <seppo.takalo@nordicsemi.no>
1 parent c1404a1 commit ba4fc7c

10 files changed

Lines changed: 136 additions & 2 deletions

‎drivers/CMakeLists.txt‎

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# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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add_subdirectory_ifdef(CONFIG_DTR_UART dtr_uart)
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add_subdirectory_ifdef(CONFIG_MODEM_NRF91SM nrf91-sm)

‎drivers/Kconfig‎

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menu "Drivers"
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rsource "dtr_uart/Kconfig"
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rsource "nrf91-sm/Kconfig"
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endmenu

‎drivers/nrf91-sm/CMakeLists.txt‎

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#
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# Copyright (c) 2026 Nordic Semiconductor ASA
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#
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# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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#
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zephyr_library()
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zephyr_library_sources(nordic_nrf91sm.c)

‎drivers/nrf91-sm/Kconfig‎

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#
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# Copyright (c) 2026 Nordic Semiconductor ASA
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#
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# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
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config MODEM_NRF91SM
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bool "Nordic nRF91 Serial Modem support"
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default y
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depends on DT_HAS_NORDIC_NRF91_SM_V2_ENABLED
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select MODEM_CELLULAR
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help
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Modem driver for Nordic nRF91 series running
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the Serial Modem application v2.0.0 or later.

‎drivers/nrf91-sm/nordic_nrf91sm.c‎

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#include <zephyr/drivers/modem/modem_cellular.h>
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#include <zephyr/device.h>
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MODEM_CELLULAR_COMMON_CHAT_MATCHES();
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MODEM_CELLULAR_UNSOL_DEFINE(nordic_nrf91_unsol, MODEM_CELLULAR_COMMON_UNSOL_MATCHES);
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MODEM_CHAT_MATCH_DEFINE(xiccid_match, "%XICCID: ", "", modem_cellular_chat_on_iccid);
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MODEM_CHAT_MATCH_DEFINE(uicc_initialized, "%XSIM: 1", "", NULL);
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MODEM_CHAT_SCRIPT_CMDS_DEFINE(
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init_chat_script_cmds, MODEM_CHAT_SCRIPT_CMD_RESP("AT", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CMEE=1", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CGSN", imei_match), MODEM_CHAT_SCRIPT_CMD_RESP("", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CGMM", cgmm_match), MODEM_CHAT_SCRIPT_CMD_RESP("", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CGMI", cgmi_match), MODEM_CHAT_SCRIPT_CMD_RESP("", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CGMR", cgmr_match), MODEM_CHAT_SCRIPT_CMD_RESP("", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT#XCMUXURC=1", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT%XSIM=1", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT%XSIM?\rAT+CFUN=41", uicc_initialized),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT%XICCID", xiccid_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("", ok_match), MODEM_CHAT_SCRIPT_CMD_RESP("AT+CIMI", cimi_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("", ok_match), MODEM_CHAT_SCRIPT_CMD_RESP("AT%XSIM=0", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CMUX=0", ok_match));
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MODEM_CHAT_SCRIPT_DEFINE(init_chat_script, init_chat_script_cmds, abort_matches,
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modem_cellular_chat_callback_handler, 10);
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MODEM_CHAT_SCRIPT_CMDS_DEFINE(network_cmds, MODEM_CHAT_SCRIPT_CMD_RESP("AT+CEREG=1", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CEREG?", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CFUN=1", ok_match));
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MODEM_CHAT_SCRIPT_DEFINE(network_chat_script, network_cmds, abort_matches,
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modem_cellular_chat_callback_handler, 10);
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MODEM_CHAT_SCRIPT_CMDS_DEFINE(dial_chat_script_cmds,
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CGDATA", connect_match));
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MODEM_CHAT_SCRIPT_DEFINE(dial_chat_script, dial_chat_script_cmds, abort_matches,
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modem_cellular_chat_callback_handler, 10);
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MODEM_CHAT_SCRIPT_CMDS_DEFINE(shutdown_chat_script_cmds,
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CEREG=0", ok_match),
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MODEM_CHAT_SCRIPT_CMD_RESP("AT+CFUN=0", ok_match));
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MODEM_CHAT_SCRIPT_DEFINE(shutdown_chat_script, shutdown_chat_script_cmds, abort_matches,
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modem_cellular_chat_callback_handler, 10);
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static const struct modem_cellular_config_scripts nrf91_sm_scripts = {
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.init = &init_chat_script,
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.network = &network_chat_script,
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.dial = &dial_chat_script,
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.shutdown = &shutdown_chat_script,
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};
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#define NRF91SM_DEVICE(inst) \
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MODEM_DT_INST_PPP_DEFINE(inst, MODEM_CELLULAR_INST_NAME(ppp, inst), NULL, 98, 1500, 64); \
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\
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static struct modem_cellular_data MODEM_CELLULAR_INST_NAME(data, inst) = { \
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.chat_delimiter = "\r\n", \
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.ppp = &MODEM_CELLULAR_INST_NAME(ppp, inst), \
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}; \
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\
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MODEM_CELLULAR_DEFINE_AND_INIT_USER_PIPES(inst, (user_pipe_0, 3), (user_pipe_1, 4)) \
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\
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MODEM_CELLULAR_DEFINE_INSTANCE(inst, 0, 500, 2000, 100, true, &nrf91_sm_scripts, \
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&nordic_nrf91_unsol)
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#define DT_DRV_COMPAT nordic_nrf91_sm_v2
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DT_INST_FOREACH_STATUS_OKAY(NRF91SM_DEVICE)
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#undef DT_DRV_COMPAT

‎dts/bindings/nordic,nrf91-sm-v2.yaml‎

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# Copyright (c) 2026 Nordic Semiconductor ASA
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# SPDX-License-Identifier: Apache-2.0
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title: Nordic nRF91 Serial Modem
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description: |
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Nordic nRF91 series running the Serial Modem application v2.0.0 or later.
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This includes the nRF91M1 module.
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compatible: "nordic,nrf91-sm-v2"
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include: zephyr,cellular-modem-device.yaml
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properties:
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zephyr,use-default-pdp-ctx:
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default: 1
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zephyr,mdm-reset-behavior:
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default: ["toggle_on_recovery"]
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autostarts:
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required: true

‎samples/sm_ppp_shell/boards/nrf54l15dk_nrf54l15_cpuapp.conf‎

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# For debugging purposes, enable GPIO shell commands.
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CONFIG_GPIO=y
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CONFIG_GPIO_SHELL=y
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CONFIG_SHELL_WILDCARD=n
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CONFIG_MODEM_AT_SHELL=y
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CONFIG_MODEM_AT_USER_PIPE_IDX=0
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CONFIG_MODEM_CMUX_MSC_FC_THRESHOLD=32

‎samples/sm_ppp_shell/boards/nrf54l15dk_nrf54l15_cpuapp.overlay‎

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zephyr,console = &uart20;
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zephyr,shell-uart = &uart20;
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};
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aliases {
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modem = &modem;
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};
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};
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/* Zephyr modem UART <-> nRF91 Serial Modem UART */
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/* Nordic nRF91 Serial Modem configuration */
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modem: modem {
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compatible = "nordic,nrf91-slm";
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compatible = "nordic,nrf91-sm-v2";
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status = "okay";
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mdm-ring-gpios = <&gpio1 12 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
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mdm-dtr-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
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zephyr,pm-device-runtime-auto;
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cmux-enable-runtime-power-save;
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cmux-close-pipe-on-power-save;
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cmux-idle-timeout-ms = <5000>;
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autostarts;
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};
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};
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‎samples/sm_ppp_shell/boards/nrf54l15dk_nrf54l15_cpuapp_ns.conf‎

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# When building for /NS, silence TFM logs to avoid conflicts with modem UART.
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CONFIG_TFM_LOG_LEVEL_SILENCE=y
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CONFIG_SHELL_WILDCARD=n
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CONFIG_MODEM_AT_SHELL=y
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CONFIG_MODEM_AT_USER_PIPE_IDX=0
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CONFIG_MODEM_CMUX_MSC_FC_THRESHOLD=32

‎samples/sm_ppp_shell/boards/nrf54l15dk_nrf54l15_cpuapp_ns.overlay‎

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zephyr,console = &uart20;
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zephyr,shell-uart = &uart20;
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};
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aliases {
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modem = &modem;
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};
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};
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/* Zephyr modem UART <-> nRF91 Serial Modem UART */
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/* Nordic nRF91 Serial Modem configuration */
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modem: modem {
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compatible = "nordic,nrf91-slm";
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compatible = "nordic,nrf91-sm-v2";
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status = "okay";
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mdm-ring-gpios = <&gpio1 12 (GPIO_ACTIVE_LOW | GPIO_PULL_UP)>;
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mdm-dtr-gpios = <&gpio1 11 GPIO_ACTIVE_LOW>;
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zephyr,pm-device-runtime-auto;
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cmux-enable-runtime-power-save;
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cmux-close-pipe-on-power-save;
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cmux-idle-timeout-ms = <5000>;
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autostarts;
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};
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};
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