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tests: nvmem: api: Add test suite for NVMEM devicetree API
Add basic testing to validate devictree macros for the NVMEM subsystem. Add testing with an EEPROM backend. Signed-off-by: Pieter De Gendt <[email protected]>
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‎dts/bindings/test/vnd,nvmem-consumer.yaml‎

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# Copyright (c) 2025 Basalte bv
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# SPDX-License-Identifier: Apache-2.0
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description: Test NVMEM consumer node
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compatible: "vnd,nvmem-consumer"
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include: [nvmem-consumer.yaml]

‎tests/subsys/nvmem/api/CMakeLists.txt‎

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# Copyright (c) 2025 Basalte bv
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# SPDX-License-Identifier: Apache-2.0
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(nvmem_eeprom)
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target_sources(app PRIVATE src/main.c)

‎tests/subsys/nvmem/api/eeprom.overlay‎

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/**
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* Copyright (c) 2025, Basalte bv
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* SPDX-License-Identifier: Apache-2.0
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*/
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/ {
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aliases {
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nvmem0 = &eeprom0;
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};
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test_consumer0: test-consumer0 {
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compatible = "vnd,nvmem-consumer";
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nvmem-cells = <&cell0>, <&cell10>;
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nvmem-cell-names = "cell0", "cell10";
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};
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};
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&eeprom0 {
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nvmem-layout {
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compatible = "fixed-layout";
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#address-cells = <1>;
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#size-cells = <1>;
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cell0: cell@0 {
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reg = <0x0 0x10>;
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#nvmem-cell-cells = <0>;
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};
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cell10: cell@10 {
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reg = <0x10 0x10>;
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read-only;
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#nvmem-cell-cells = <0>;
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};
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};
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};

‎tests/subsys/nvmem/api/prj.conf‎

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CONFIG_ZTEST=y
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CONFIG_NVMEM=y

‎tests/subsys/nvmem/api/src/main.c‎

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/**
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* Copyright (c) 2025 Basalte bv
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/ztest.h>
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#include <zephyr/nvmem.h>
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#define consumer0 DT_NODELABEL(test_consumer0)
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#define nvmem0 DT_ALIAS(nvmem0)
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static const struct nvmem_cell cell0 = NVMEM_CELL_GET_BY_IDX(consumer0, 0);
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static const struct nvmem_cell cell10 = NVMEM_CELL_GET_BY_NAME(consumer0, cell10);
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ZTEST(nvmem_api, test_nvmem_api)
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{
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uint8_t buf[0x10];
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int ret;
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zexpect_equal_ptr(cell0.dev, DEVICE_DT_GET(nvmem0));
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zexpect_equal(cell0.offset, 0);
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zexpect_equal(cell0.size, 0x10);
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zexpect_false(cell0.read_only);
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zexpect_equal_ptr(cell10.dev, DEVICE_DT_GET(nvmem0));
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zexpect_equal(cell10.offset, 0x10);
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zexpect_equal(cell10.size, 0x10);
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zexpect_true(cell10.read_only);
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for (size_t i = 0; i < sizeof(buf); ++i) {
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buf[i] = 2 * i;
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}
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ret = nvmem_cell_write(&cell0, buf, 0, sizeof(buf));
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zassert_ok(ret, "Failed to write NVMEM");
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memset(buf, 0, sizeof(buf));
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ret = nvmem_cell_read(&cell0, buf, 0, sizeof(buf));
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zassert_ok(ret, "Failed to read NVMEM");
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for (size_t i = 0; i < sizeof(buf); ++i) {
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zexpect_equal(buf[i], 2 * i);
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}
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ret = nvmem_cell_write(&cell10, buf, 0, sizeof(buf));
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zassert_equal(ret, -EROFS, "Expected read-only NVMEM");
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}
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ZTEST_SUITE(nvmem_api, NULL, NULL, NULL, NULL, NULL);

‎tests/subsys/nvmem/api/testcase.yaml‎

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common:
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platform_allow:
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- native_sim
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integration_platforms:
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- native_sim
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tags:
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- nvmem
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tests:
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subsys.nvmem.eeprom:
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extra_configs:
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- CONFIG_EEPROM=y
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extra_dtc_overlay_files:
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- eeprom.overlay

‎tests/subsys/nvmem/devicetree/CMakeLists.txt‎

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# Copyright (c) 2025 Basalte bv
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# SPDX-License-Identifier: Apache-2.0
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(nvmem_devictree)
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target_sources(app PRIVATE src/main.c)

‎tests/subsys/nvmem/devicetree/app.overlay‎

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/**
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* Copyright (c) 2025, Basalte bv
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* SPDX-License-Identifier: Apache-2.0
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*/
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/ {
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test_consumer0: test-consumer0 {
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compatible = "vnd,nvmem-consumer";
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nvmem-cells = <&cell0>, <&cell10>;
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nvmem-cell-names = "cell0", "cell10";
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};
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test_provider0: test-provider0 {
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nvmem-layout {
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compatible = "fixed-layout";
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#address-cells = <1>;
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#size-cells = <1>;
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cell0: cell@0 {
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reg = <0x0 0x10>;
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#nvmem-cell-cells = <0>;
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};
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cell10: cell@10 {
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reg = <0x10 0x10>;
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read-only;
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#nvmem-cell-cells = <0>;
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};
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};
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};
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};

‎tests/subsys/nvmem/devicetree/prj.conf‎

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CONFIG_ZTEST=y
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CONFIG_NVMEM=y

‎tests/subsys/nvmem/devicetree/src/main.c‎

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/**
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* Copyright (c) 2025 Basalte bv
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <zephyr/ztest.h>
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#include <zephyr/nvmem.h>
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#define consumer0 DT_NODELABEL(test_consumer0)
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ZTEST(nvmem_devictree, test_nvmem_devictree)
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{
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zexpect_equal(DT_NVMEM_CELLS_HAS_IDX(consumer0, 0), 1);
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zexpect_equal(DT_NVMEM_CELLS_HAS_IDX(consumer0, 1), 1);
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zexpect_equal(DT_NVMEM_CELLS_HAS_IDX(consumer0, 2), 0);
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zexpect_equal(DT_NVMEM_CELLS_HAS_NAME(consumer0, cell0), 1);
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zexpect_equal(DT_NVMEM_CELLS_HAS_NAME(consumer0, cell10), 1);
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zexpect_equal(DT_NVMEM_CELLS_HAS_NAME(consumer0, missing), 0);
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zexpect_equal(DT_NUM_NVMEM_CELLS(consumer0), 2);
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zexpect_str_equal(DT_NODE_PATH(DT_NVMEM_CELL_BY_IDX(consumer0, 0)),
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"/test-provider0/nvmem-layout/cell@0");
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zexpect_str_equal(DT_NODE_PATH(DT_NVMEM_CELL_BY_IDX(consumer0, 1)),
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"/test-provider0/nvmem-layout/cell@10");
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zexpect_str_equal(DT_NODE_PATH(DT_NVMEM_CELL_BY_NAME(consumer0, cell0)),
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"/test-provider0/nvmem-layout/cell@0");
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zexpect_str_equal(DT_NODE_PATH(DT_NVMEM_CELL_BY_NAME(consumer0, cell10)),
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"/test-provider0/nvmem-layout/cell@10");
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zexpect_str_equal(DT_NODE_PATH(DT_MTD_FROM_NVMEM_CELL(DT_NVMEM_CELL(consumer0))),
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"/test-provider0");
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}
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#define DT_DRV_COMPAT vnd_nvmem_consumer
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ZTEST(nvmem_devictree, test_nvmem_devictree_inst)
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{
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zexpect_equal(DT_INST_NVMEM_CELLS_HAS_IDX(0, 0), 1);
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zexpect_equal(DT_INST_NVMEM_CELLS_HAS_IDX(0, 1), 1);
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zexpect_equal(DT_INST_NVMEM_CELLS_HAS_IDX(0, 2), 0);
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zexpect_equal(DT_INST_NVMEM_CELLS_HAS_NAME(0, cell0), 1);
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zexpect_equal(DT_INST_NVMEM_CELLS_HAS_NAME(0, cell10), 1);
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zexpect_equal(DT_INST_NVMEM_CELLS_HAS_NAME(0, missing), 0);
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zexpect_equal(DT_INST_NUM_NVMEM_CELLS(0), 2);
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zexpect_str_equal(DT_NODE_PATH(DT_INST_NVMEM_CELL_BY_IDX(0, 0)),
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"/test-provider0/nvmem-layout/cell@0");
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zexpect_str_equal(DT_NODE_PATH(DT_INST_NVMEM_CELL_BY_IDX(0, 1)),
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"/test-provider0/nvmem-layout/cell@10");
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zexpect_str_equal(DT_NODE_PATH(DT_INST_NVMEM_CELL_BY_NAME(0, cell0)),
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"/test-provider0/nvmem-layout/cell@0");
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zexpect_str_equal(DT_NODE_PATH(DT_INST_NVMEM_CELL_BY_NAME(0, cell10)),
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"/test-provider0/nvmem-layout/cell@10");
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zexpect_str_equal(DT_NODE_PATH(DT_MTD_FROM_NVMEM_CELL(DT_INST_NVMEM_CELL(0))),
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"/test-provider0");
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}
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#undef DT_DRV_COMPAT
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ZTEST_SUITE(nvmem_devictree, NULL, NULL, NULL, NULL, NULL);

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