[nrf fromlist] tests: drivers: audio: dmic_api: Enable test execution on nrf54l15

Enable execution of dmic_api test on nrf54l15:
- add 'dmic' to the list of supported peripherals;
- add overlay for nrf54l15;
- align Nordic's implementation of PDM driver to pass the test.

Upstream PR #: 82436

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

Author: nordic-segl

boards/nordic/nrf54l15dk/nrf54l15dk_nrf54l15_cpuapp.yaml

@@ -15,6 +15,7 @@ flash: 324
 supported:
   - adc
   - counter
+  - dmic
   - gpio
   - i2c
   - pwm

drivers/audio/dmic_nrfx_pdm.c

@@ -365,7 +365,6 @@ static int dmic_nrfx_pdm_configure(const struct device *dev,
 
 	channel->act_num_streams = 1;
 	channel->act_chan_map_hi = 0;
-	channel->act_chan_map_lo = def_map;
 
 	if (channel->req_num_streams != 1 ||
 	    channel->req_num_chan > 2 ||
@@ -396,9 +395,13 @@ static int dmic_nrfx_pdm_configure(const struct device *dev,
 	nrfx_cfg.mode = channel->req_num_chan == 1
 		      ? NRF_PDM_MODE_MONO
 		      : NRF_PDM_MODE_STEREO;
-	nrfx_cfg.edge = channel->req_chan_map_lo == def_map
-		      ? NRF_PDM_EDGE_LEFTFALLING
-		      : NRF_PDM_EDGE_LEFTRISING;
+	if (channel->req_chan_map_lo == def_map) {
+		nrfx_cfg.edge = NRF_PDM_EDGE_LEFTFALLING;
+		channel->act_chan_map_lo = def_map;
+	} else {
+		nrfx_cfg.edge = NRF_PDM_EDGE_LEFTRISING;
+		channel->act_chan_map_lo = alt_map;
+	}
 #if NRF_PDM_HAS_MCLKCONFIG
 	nrfx_cfg.mclksrc = drv_cfg->clk_src == ACLK
 			 ? NRF_PDM_MCLKSRC_ACLK

tests/drivers/audio/dmic_api/boards/nrf54l15dk_nrf54l15_cpuapp.overlay

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2024 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		dmic-dev = &pdm20;
+	};
+};
+
+&pinctrl {
+	pdm20_default_alt: pdm20_default_alt {
+		group1 {
+			psels = <NRF_PSEL(PDM_CLK, 1, 12)>,
+				<NRF_PSEL(PDM_DIN, 1, 13)>;
+		};
+	};
+};
+
+dmic_dev: &pdm20 {
+	status = "okay";
+	pinctrl-0 = <&pdm20_default_alt>;
+	pinctrl-names = "default";
+	clock-source = "PCLK32M";
+};

tests/drivers/audio/dmic_api/src/main.c

@@ -21,14 +21,21 @@ static const struct device *dmic_dev = DEVICE_DT_GET(DT_ALIAS(dmic_dev));
 #define BYTES_PER_SAMPLE sizeof(int16_t)
 #define SLAB_ALIGN 4
 #define MAX_SAMPLE_RATE  48000
+#elif DT_HAS_COMPAT_STATUS_OKAY(nordic_nrf_pdm)
+#define PDM_CHANNELS 2
+#define SAMPLE_BIT_WIDTH 16
+#define BYTES_PER_SAMPLE sizeof(int16_t)
+#define SLAB_ALIGN 4
+#define MAX_SAMPLE_RATE  48000
+#else
+#error "Unsupported DMIC device"
+#endif
+
 /* Milliseconds to wait for a block to be read. */
 #define READ_TIMEOUT 1000
 /* Size of a block for 100 ms of audio data. */
 #define BLOCK_SIZE(_sample_rate, _number_of_channels) \
 	(BYTES_PER_SAMPLE * (_sample_rate / 10) * _number_of_channels)
-#else
-#error "Unsupported DMIC device"
-#endif
 
 /* Driver will allocate blocks from this slab to receive audio data into them.
  * Application, after getting a given block from the driver and processing its