[nrf fromlist] tests: drivers: i2s: Add test with 48kHz sample rate

Add KConfig that defines frame clock frequency used
in the test execution.

Add test configuration where frame clock frequency
is set to 48000 samples per second.

Upstream PR #: 85126

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

Author: nordic-segl

tests/drivers/i2s/i2s_speed/Kconfig

@@ -37,3 +37,10 @@ config I2S_TEST_ALLOWED_DATA_OFFSET
 	help
 	  Maximum allowed offset between sent and received samples. Non-zero
 	  value of this option may be needed when GPIO loopback is used.
+
+config I2S_TEST_SPEED
+	int "I2S frame clock frequency"
+	default 44000
+	help
+	  Value assigned to the i2s_cfg.frame_clk_freq.
+	  Frame clock (WS) frequency, this is sampling rate used in the test.

tests/drivers/i2s/i2s_speed/src/test_i2s_speed.c

@@ -125,7 +125,7 @@ static int verify_buf(int16_t *rx_block, int att)
 }
 
 #define TIMEOUT          2000
-#define FRAME_CLK_FREQ   44000
+#define FRAME_CLK_FREQ   CONFIG_I2S_TEST_SPEED
 
 static int configure_stream(const struct device *dev_i2s, enum i2s_dir dir)
 {

tests/drivers/i2s/i2s_speed/testcase.yaml

@@ -5,7 +5,7 @@ tests:
       - drivers
       - i2s
     filter: not CONFIG_I2S_TEST_USE_GPIO_LOOPBACK
-  drivers.i2s.speed.gpio_loopback:
+  drivers.i2s.speed.gpio_loopback.44000:
     depends_on:
       - i2s
       - gpio
@@ -16,3 +16,16 @@ tests:
     harness: ztest
     harness_config:
       fixture: gpio_loopback
+  drivers.i2s.speed.gpio_loopback.48000:
+    depends_on:
+      - i2s
+      - gpio
+    tags:
+      - drivers
+      - i2s
+    filter: CONFIG_I2S_TEST_USE_GPIO_LOOPBACK
+    harness: ztest
+    harness_config:
+      fixture: gpio_loopback
+    extra_configs:
+      - CONFIG_I2S_TEST_SPEED=48000