nxp: Add SAI driver with the DAI interface

drivers/clock_control/clock_control_mcux_ccm_rev2.c

@@ -115,6 +115,24 @@ static int mcux_ccm_get_subsys_rate(const struct device *dev,
 		break;
 #endif
 
+#if defined(CONFIG_SOC_MIMX93_A55) && defined(CONFIG_DAI_NXP_SAI)
+	case IMX_CCM_SAI1_CLK:
+	case IMX_CCM_SAI2_CLK:
+	case IMX_CCM_SAI3_CLK:
+		clock_root = kCLOCK_Root_Sai1 + instance;
+		uint32_t mux = CLOCK_GetRootClockMux(clock_root);
+		uint32_t divider = CLOCK_GetRootClockDiv(clock_root);
+
+		/* assumption: SAI's SRC is AUDIO_PLL */
+		if (mux != 1) {
+			return -EINVAL;
+		}
+
+		/* assumption: AUDIO_PLL's frequency is 393216000 Hz */
+		*rate = 393216000 / divider;
+
+		return 0;
+#endif
 	default:
 		return -EINVAL;
 	}

drivers/dai/CMakeLists.txt

@@ -4,3 +4,4 @@ add_subdirectory_ifdef(CONFIG_DAI_INTEL_SSP intel/ssp)
 add_subdirectory_ifdef(CONFIG_DAI_INTEL_ALH intel/alh)
 add_subdirectory_ifdef(CONFIG_DAI_INTEL_DMIC intel/dmic)
 add_subdirectory_ifdef(CONFIG_DAI_INTEL_HDA intel/hda)
+add_subdirectory_ifdef(CONFIG_DAI_NXP_SAI nxp/sai)

drivers/dai/Kconfig

@@ -29,5 +29,6 @@ source "drivers/dai/intel/ssp/Kconfig.ssp"
 source "drivers/dai/intel/alh/Kconfig.alh"
 source "drivers/dai/intel/dmic/Kconfig.dmic"
 source "drivers/dai/intel/hda/Kconfig.hda"
+source "drivers/dai/nxp/sai/Kconfig.sai"
 
 endif # DAI

drivers/dai/nxp/sai/CMakeLists.txt

@@ -0,0 +1,5 @@
+# Copyright 2023 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+zephyr_library_sources(sai.c)

drivers/dai/nxp/sai/Kconfig.sai

@@ -0,0 +1,30 @@
+# Copyright 2023 NXP
+# SPDX-License-Identifier: Apache-2.0
+
+config DAI_NXP_SAI
+	bool "NXP Synchronous Audio Interface (SAI) driver"
+	default y
+	depends on DT_HAS_NXP_DAI_SAI_ENABLED
+	help
+		Select this to enable NXP SAI driver.
+
+if DAI_NXP_SAI
+
+config SAI_HAS_MCLK_CONFIG_OPTION
+	bool "Set if SAI has MCLK configuration options"
+	default n
+	help
+		Select this if the SAI IP allows configuration
+		of the master clock. Master clock configuration
+		refers to enabling/disabling the master clock,
+		setting the signal as input or output or dividing
+		the master clock output.
+
+config SAI_FIFO_WORD_SIZE
+	int "Size (in bytes) of a FIFO word"
+	default 4
+	help
+		Use this to set the size (in bytes) of a SAI
+		FIFO word.
+
+endif # DAI_NXP_SAI