drivers: clock_control: mcux_syscon: add definition for DMIC clock

Add definition for DMIC clock source to LPC SYSCON clock control driver.
This constant allows drivers to get the DMIC bit clock frequency.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>

drivers/clock_control/clock_control_mcux_syscon.c

@@ -178,6 +178,11 @@ static int mcux_lpc_syscon_clock_control_get_subsys_rate(
 	case MCUX_LCDIF_PIXEL_CLK:
 		*rate = CLOCK_GetDcPixelClkFreq();
 		break;
+#endif
+#if defined(CONFIG_AUDIO_DMIC_MCUX)
+	case MCUX_DMIC_CLK:
+		*rate = CLOCK_GetDmicClkFreq();
+		break;
 #endif
 	}
 

include/zephyr/dt-bindings/clock/mcux_lpc_syscon_clock.h

@@ -51,6 +51,8 @@
 
 #define MCUX_SCTIMER_CLK		34
 
+#define MCUX_DMIC_CLK			35
+
 #define MCUX_MRT_CLK			40
 
 #endif /* ZEPHYR_INCLUDE_DT_BINDINGS_CLOCK_MCUX_LPC_SYSCON_H_ */