drivers: audio: dmic_nrfx_pdm: Add support for pinctrl

Add support for the new pinctrl API to the DMIC driver that handles
the nRF PDM peripheral. Update code of the driver and the related
devicetree binding.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>

drivers/audio/dmic_nrfx_pdm.c

@@ -6,6 +6,8 @@
 
 #include <audio/dmic.h>
 #include <drivers/clock_control/nrf_clock_control.h>
+#include <drivers/pinctrl.h>
+#include <soc.h>
 #include <nrfx_pdm.h>
 
 #include <logging/log.h>
@@ -26,6 +28,9 @@ struct dmic_nrfx_pdm_drv_data {
 struct dmic_nrfx_pdm_drv_cfg {
 	nrfx_pdm_event_handler_t event_handler;
 	nrfx_pdm_config_t nrfx_def_cfg;
+#ifdef CONFIG_PINCTRL
+	const struct pinctrl_dev_config *pcfg;
+#endif
 	enum clock_source {
 		PCLK32M,
 		PCLK32M_HFXO,
@@ -532,15 +537,26 @@ static const struct _dmic_ops dmic_ops = {
 };
 
 #define PDM(idx) DT_NODELABEL(pdm##idx)
+#define PDM_PIN(idx, name) DT_PROP_OR(PDM(idx), name##_pin, 0)
 #define PDM_CLK_SRC(idx) DT_STRING_TOKEN(PDM(idx), clock_source)
 
 #define PDM_NRFX_DEVICE(idx)						     \
+	NRF_DT_ENSURE_PINS_ASSIGNED(PDM(idx), clk_pin);			     \
 	static void *rx_msgs##idx[DT_PROP(PDM(idx), queue_size)];	     \
 	static struct dmic_nrfx_pdm_drv_data dmic_nrfx_pdm_data##idx;	     \
 	static int pdm_nrfx_init##idx(const struct device *dev)		     \
 	{								     \
 		IRQ_CONNECT(DT_IRQN(PDM(idx)), DT_IRQ(PDM(idx), priority),   \
 			    nrfx_isr, nrfx_pdm_irq_handler, 0);		     \
+		IF_ENABLED(CONFIG_PINCTRL, (				     \
+			const struct dmic_nrfx_pdm_drv_cfg *drv_cfg =	     \
+				dev->config;				     \
+			int err = pinctrl_apply_state(drv_cfg->pcfg,	     \
+						      PINCTRL_STATE_DEFAULT);\
+			if (err < 0) {					     \
+				return err;				     \
+			}						     \
+		))							     \
 		k_msgq_init(&dmic_nrfx_pdm_data##idx.rx_queue,		     \
 			    (char *)rx_msgs##idx, sizeof(void *),	     \
 			    ARRAY_SIZE(rx_msgs##idx));			     \
@@ -551,11 +567,15 @@ static const struct _dmic_ops dmic_ops = {
 	{								     \
 		event_handler(DEVICE_DT_GET(PDM(idx)), evt);		     \
 	}								     \
+	IF_ENABLED(CONFIG_PINCTRL, (PINCTRL_DT_DEFINE(PDM(idx))));	     \
 	static const struct dmic_nrfx_pdm_drv_cfg dmic_nrfx_pdm_cfg##idx = { \
 		.event_handler = event_handler##idx,			     \
-		.nrfx_def_cfg =	NRFX_PDM_DEFAULT_CONFIG(		     \
+		.nrfx_def_cfg =	NRFX_PDM_DEFAULT_CONFIG(PDM_PIN(idx, clk),   \
-					DT_PROP(PDM(idx), clk_pin),	     \
+							PDM_PIN(idx, din)),  \
-					DT_PROP(PDM(idx), din_pin)),	     \
+		IF_ENABLED(CONFIG_PINCTRL,				     \
+			(.nrfx_def_cfg.skip_gpio_cfg = true,		     \
+			 .nrfx_def_cfg.skip_psel_cfg = true,		     \
+			 .pcfg = PINCTRL_DT_DEV_CONFIG_GET(PDM(idx)),))      \
 		.clk_src = PDM_CLK_SRC(idx),				     \
 	};								     \
 	BUILD_ASSERT(PDM_CLK_SRC(idx) != ACLK || NRF_PDM_HAS_MCLKCONFIG,     \

dts/bindings/audio/nordic,nrf-pdm.yaml

@@ -5,7 +5,7 @@ description: Nordic PDM (Pulse Density Modulation interface)
 
 compatible: "nordic,nrf-pdm"
 
-include: base.yaml
+include: [base.yaml, pinctrl-device.yaml]
 
 properties:
     reg:
@@ -16,13 +16,32 @@ properties:
 
     clk-pin:
       type: int
-      required: true
+      required: false
-      description: CLK pin
+      description: |
+        IMPORTANT: This option will only be used if the new pin control driver
+        is not enabled. It will be deprecated in the future.
+
+        The CLK pin to use.
+
+        For pins P0.0 through P0.31, use the pin number. For example,
+        to use P0.16 for CLK, set:
+
+            clk-pin = <16>;
+
+        For pins P1.0 through P1.31, add 32 to the pin number. For
+        example, to use P1.2 for CLK, set:
+
+            clk-pin = <34>;  /* 32 + 2 */
 
     din-pin:
       type: int
-      required: true
+      required: false
-      description: DIN pin
+      description: |
+        IMPORTANT: This option will only be used if the new pin control driver
+        is not enabled. It will be deprecated in the future.
+
+        The DIN pin to use. The pin numbering scheme is the same as
+        the clk-pin property's.
 
     clock-source:
       type: string