tests: boards: espressif: Add RTC CLK test

Add tests for the rtc clk subsystem.

Signed-off-by: Lucas Tamborrino <[email protected]>

tests/boards/espressif_esp32/rtc_clk/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(rtc_clk_test)
+
+target_sources(app PRIVATE src/rtc_clk_test.c)

tests/boards/espressif_esp32/rtc_clk/Kconfig

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+# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+mainmenu "RTC CLK Test Configuration"
+
+source "Kconfig.zephyr"
+
+config FIXTURE_XTAL
+	bool "Selected when external crystal is present"
+	default n

tests/boards/espressif_esp32/rtc_clk/README.rst

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+.. _rtc_clk_test:
+
+Espressif's RTC Clock test
+##########################
+
+Overview
+********
+
+This test iterates through all the clock sources and checks if the expected frequency is being set.
+Espressif SOCs have 3 main clock subsystems: CPU, RTC_FAST and RTC_SLOW. Each of these subsystems have their own clock sources and possible rates.
+
+
+Supported Boards
+****************
+- esp32_devkitc_wrover/esp32/procpu
+- esp32c3_devkitm
+- esp32s2_saola
+- esp32s3_devkitm/esp32s3/procpu
+
+Building and Running
+********************
+
+Make sure you have the target connected over USB port.
+
+.. code-block:: console
+
+   west build -b <board> tests/boards/espressif_esp32/rtc_clk
+   west flash && west espressif monitor
+
+To run the test with twister, use the following command:
+
+.. code-block:: console
+
+   west twister -p <board> --device-testing --device-serial=/dev/ttyUSB0 -vv --flash-before -T tests/boards/espressif_esp32/rtc_clk
+
+If the external 32K crystal is connect to pins 32K_XP and 32K_XN, the test can be run with `external_xtal` fixture enabled:
+
+.. code-block:: console
+
+	west twister -p esp32c3_devkitm --device-testing --device-serial=/dev/ttyUSB0 -vv --flash-before -T tests/boards/espressif_esp32/rtc_clk -X external_xtal
+
+Sample Output
+=============
+
+.. code-block:: console
+
+	*** Booting Zephyr OS build v3.6.0-3162-g529005998ea6 ***
+   Running TESTSUITE rtc_clk
+   ===================================================================
+   CPU frequency: 240000000
+   RTC_FAST frequency: 17500000
+   RTC_SLOW frequency: 136000
+   START - test_cpu_pll_src
+   Testing CPU frequency: 80 MHz
+   Testing CPU frequency: 160 MHz
+   Testing CPU frequency: 240 MHz
+   PASS - test_cpu_pll_src in 0.020 seconds
+   ===================================================================
+   START - test_cpu_xtal_src
+   Testing CPU frequency: 40 MHz
+   Testing CPU frequency: 20 MHz
+   Testing CPU frequency: 10 MHz
+   Testing CPU frequency: 5 MHz
+   PASS - test_cpu_xtal_src in 17.645 seconds
+   ===================================================================
+   START - test_rtc_fast_src
+   Testing RTC FAST CLK freq: 20000000 MHz
+   Testing RTC FAST CLK freq: 17500000 MHz
+   PASS - test_rtc_fast_src in 0.001 seconds
+   ===================================================================
+   START - test_rtc_slow_src
+   Testing RTC SLOW CLK freq: 136000 MHz
+   Testing RTC SLOW CLK freq: 68359 MHz
+   PASS - test_rtc_slow_src in 0.002 seconds
+   ===================================================================
+   TESTSUITE rtc_clk succeeded
+   ------ TESTSUITE SUMMARY START ------
+   SUITE PASS - 100.00% [rtc_clk]: pass = 4, fail = 0, skip = 0, total = 4 duration = 17.668 seconds
+   - PASS - [rtc_clk.test_cpu_pll_src] duration = 0.020 seconds
+   - PASS - [rtc_clk.test_cpu_xtal_src] duration = 17.645 seconds
+   - PASS - [rtc_clk.test_rtc_fast_src] duration = 0.001 seconds
+   - PASS - [rtc_clk.test_rtc_slow_src] duration = 0.002 seconds
+   ------ TESTSUITE SUMMARY END ------
+   ===================================================================
+   PROJECT EXECUTION SUCCESSFUL

tests/boards/espressif_esp32/rtc_clk/prj.conf

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+CONFIG_ZTEST=y

tests/boards/espressif_esp32/rtc_clk/src/rtc_clk_test.c

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+/*
+ * Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/ztest.h>
+#include <zephyr/devicetree.h>
+#include <zephyr/sys/printk.h>
+#include <zephyr/drivers/clock_control/esp32_clock_control.h>
+#include <zephyr/drivers/clock_control.h>
+
+#if defined(CONFIG_SOC_SERIES_ESP32)
+#define DT_CPU_COMPAT espressif_xtensa_lx6
+#elif defined(CONFIG_SOC_SERIES_ESP32S2) || defined(CONFIG_SOC_SERIES_ESP32S3)
+#define DT_CPU_COMPAT espressif_xtensa_lx7
+#elif CONFIG_SOC_SERIES_ESP32C3
+#define DT_CPU_COMPAT espressif_riscv
+#endif
+
+static const struct device *const clk_dev = DEVICE_DT_GET_ONE(espressif_esp32_rtc);
+
+static void *rtc_clk_setup(void)
+{
+	zassert_true(device_is_ready(clk_dev), "CLK device is not ready");
+	uint32_t rate = 0;
+	int ret = 0;
+
+	ret = clock_control_get_rate(clk_dev,
+				     (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_CPU, &rate);
+	zassert_false(ret, "Failed to get CPU clock rate");
+	TC_PRINT("CPU frequency: %d\n", rate);
+
+	ret = clock_control_get_rate(
+		clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_RTC_FAST, &rate);
+	zassert_false(ret, "Failed to get RTC_FAST clock rate");
+	TC_PRINT("RTC_FAST frequency: %d\n", rate);
+
+	ret = clock_control_get_rate(
+		clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_RTC_SLOW, &rate);
+	zassert_false(ret, "Failed to get RTC_SLOW clock rate");
+	TC_PRINT("RTC_SLOW frequency: %d\n", rate);
+
+	return NULL;
+}
+
+ZTEST(rtc_clk, test_cpu_xtal_src)
+{
+	struct esp32_clock_config clk_cfg = {0};
+	int ret = 0;
+	uint32_t cpu_rate = 0;
+
+	clk_cfg.cpu.clk_src = ESP32_CPU_CLK_SRC_XTAL;
+	clk_cfg.cpu.xtal_freq = (DT_PROP(DT_INST(0, DT_CPU_COMPAT), xtal_freq) / MHZ(1));
+
+	for (uint8_t i = 0; i < 4; i++) {
+		clk_cfg.cpu.cpu_freq = clk_cfg.cpu.xtal_freq >> i;
+
+		TC_PRINT("Testing CPU frequency: %d MHz\n", clk_cfg.cpu.cpu_freq);
+
+		ret = clock_control_configure(
+			clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_CPU, &clk_cfg);
+		zassert_false(ret, "Failed to set CPU clock source");
+
+		ret = clock_control_get_rate(
+			clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_CPU, &cpu_rate);
+		zassert_false(ret, "Failed to get CPU clock rate");
+		zassert_equal(cpu_rate, clk_cfg.cpu.cpu_freq * MHZ(1),
+			      "CPU clock rate is not equal to XTAL frequency (%d != %d)", cpu_rate,
+			      clk_cfg.cpu.cpu_freq);
+	}
+}
+
+uint32_t rtc_pll_src_freq_mhz[] = {
+	ESP32_CLK_CPU_PLL_80M,
+	ESP32_CLK_CPU_PLL_160M,
+#if !defined(CONFIG_SOC_SERIES_ESP32C3)
+	ESP32_CLK_CPU_PLL_240M,
+#endif
+};
+
+ZTEST(rtc_clk, test_cpu_pll_src)
+{
+	struct esp32_clock_config clk_cfg = {0};
+	int ret = 0;
+	uint32_t cpu_rate = 0;
+
+	clk_cfg.cpu.clk_src = ESP32_CPU_CLK_SRC_PLL;
+	clk_cfg.cpu.xtal_freq = (DT_PROP(DT_INST(0, DT_CPU_COMPAT), xtal_freq) / MHZ(1));
+
+	for (uint8_t i = 0; i < ARRAY_SIZE(rtc_pll_src_freq_mhz); i++) {
+		clk_cfg.cpu.cpu_freq = rtc_pll_src_freq_mhz[i] / MHZ(1);
+
+		TC_PRINT("Testing CPU frequency: %d MHz\n", clk_cfg.cpu.cpu_freq);
+
+		ret = clock_control_configure(
+			clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_CPU, &clk_cfg);
+		zassert_false(ret, "Failed to set CPU clock source");
+
+		ret = clock_control_get_rate(
+			clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_CPU, &cpu_rate);
+		zassert_false(ret, "Failed to get CPU clock rate");
+		zassert_equal(cpu_rate, clk_cfg.cpu.cpu_freq * MHZ(1),
+			      "CPU clock rate is not equal to configured frequency (%d != %d)",
+			      cpu_rate, clk_cfg.cpu.cpu_freq);
+	}
+}
+
+uint32_t rtc_rtc_fast_clk_src[] = {
+#if defined(CONFIG_SOC_SERIES_ESP32) || defined(CONFIG_SOC_SERIES_ESP32S2)
+	ESP32_RTC_FAST_CLK_SRC_XTAL_D4,
+#else
+	ESP32_RTC_FAST_CLK_SRC_XTAL_D2,
+#endif
+	ESP32_RTC_FAST_CLK_SRC_RC_FAST};
+
+uint32_t rtc_rtc_fast_clk_src_freq_mhz[] = {
+#if defined(CONFIG_SOC_SERIES_ESP32) || defined(CONFIG_SOC_SERIES_ESP32S2)
+	DT_PROP(DT_INST(0, DT_CPU_COMPAT), xtal_freq) / 4,
+#else
+	DT_PROP(DT_INST(0, DT_CPU_COMPAT), xtal_freq) / 2,
+#endif
+	ESP32_CLK_CPU_RC_FAST_FREQ
+};
+
+ZTEST(rtc_clk, test_rtc_fast_src)
+{
+	struct esp32_clock_config clk_cfg = {0};
+	int ret = 0;
+	uint32_t cpu_rate = 0;
+
+	clk_cfg.cpu.xtal_freq = (DT_PROP(DT_INST(0, DT_CPU_COMPAT), xtal_freq) / MHZ(1));
+
+	for (uint8_t i = 0; i < ARRAY_SIZE(rtc_rtc_fast_clk_src); i++) {
+		clk_cfg.rtc.rtc_fast_clock_src = rtc_rtc_fast_clk_src[i];
+
+		TC_PRINT("Testing RTC FAST CLK freq: %d MHz\n", rtc_rtc_fast_clk_src_freq_mhz[i]);
+
+		ret = clock_control_configure(
+			clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_RTC_FAST,
+			&clk_cfg);
+		zassert_false(ret, "Failed to set CPU clock source");
+
+		ret = clock_control_get_rate(
+			clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_RTC_FAST,
+			&cpu_rate);
+		zassert_false(ret, "Failed to get RTC_FAST clock rate");
+		zassert_equal(cpu_rate, rtc_rtc_fast_clk_src_freq_mhz[i],
+			      "CPU clock rate is not equal to configured frequency (%d != %d)",
+			      cpu_rate, rtc_rtc_fast_clk_src_freq_mhz[i]);
+	}
+}
+
+uint32_t rtc_rtc_slow_clk_src[] = {
+	ESP32_RTC_SLOW_CLK_SRC_RC_SLOW,
+	ESP32_RTC_SLOW_CLK_SRC_RC_FAST_D256,
+#if CONFIG_FIXTURE_XTAL
+	ESP32_RTC_SLOW_CLK_SRC_XTAL32K,
+#endif
+};
+
+uint32_t rtc_rtc_slow_clk_src_freq[] = {
+	ESP32_RTC_SLOW_CLK_SRC_RC_SLOW_FREQ,
+	ESP32_RTC_SLOW_CLK_SRC_RC_FAST_D256_FREQ,
+#if CONFIG_FIXTURE_XTAL
+	ESP32_RTC_SLOW_CLK_SRC_XTAL32K_FREQ,
+#endif
+};
+
+ZTEST(rtc_clk, test_rtc_slow_src)
+{
+	struct esp32_clock_config clk_cfg = {0};
+	int ret = 0;
+	uint32_t cpu_rate = 0;
+
+	clk_cfg.cpu.xtal_freq = (DT_PROP(DT_INST(0, DT_CPU_COMPAT), xtal_freq) / MHZ(1));
+
+	for (uint8_t i = 0; i < ARRAY_SIZE(rtc_rtc_slow_clk_src); i++) {
+		clk_cfg.rtc.rtc_slow_clock_src = rtc_rtc_slow_clk_src[i];
+
+		TC_PRINT("Testing RTC SLOW CLK freq: %d MHz\n", rtc_rtc_slow_clk_src_freq[i]);
+
+		ret = clock_control_configure(
+			clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_RTC_SLOW,
+			&clk_cfg);
+		zassert_false(ret, "Failed to set CPU clock source");
+
+		ret = clock_control_get_rate(
+			clk_dev, (clock_control_subsys_t)ESP32_CLOCK_CONTROL_SUBSYS_RTC_SLOW,
+			&cpu_rate);
+		zassert_false(ret, "Failed to get RTC_SLOW clock rate");
+		zassert_equal(cpu_rate, rtc_rtc_slow_clk_src_freq[i],
+			      "CPU clock rate is not equal to configured frequency (%d != %d)",
+			      cpu_rate, rtc_rtc_slow_clk_src_freq[i]);
+	}
+}
+
+ZTEST_SUITE(rtc_clk, NULL, rtc_clk_setup, NULL, NULL, NULL);

tests/boards/espressif_esp32/rtc_clk/testcase.yaml

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+tests:
+  boards.esp32.rtc_clk:
+    platform_allow:
+      - esp32_devkitc_wrover/esp32/procpu
+      - esp32c3_devkitm
+      - esp32s2_saola
+      - esp32s3_devkitm/esp32s3/procpu
+  boards.esp32.rtc_clk.xtal:
+    platform_allow:
+      - esp32_devkitc_wrover/esp32/procpu
+      - esp32c3_devkitm
+      - esp32s2_saola
+      - esp32s3_devkitm/esp32s3/procpu
+    harness_config:
+      fixture: external_xtal
+    extra_configs:
+      - CONFIG_FIXTURE_XTAL=y