drivers: clock_control: add support for LPADC clock obtain

The lpadc driver needs to obtain its functional clock to configure
the acquisition time. This patch add support for I.MX RT three digit
parts, I.MX RT11xx parts, and LPC parts.

Signed-off-by: Zhaoxiang Jin <[email protected]>

Author: ZhaoxiangJin

drivers/clock_control/clock_control_mcux_ccm_rev2.c

@@ -146,6 +146,12 @@ static int mcux_ccm_get_subsys_rate(const struct device *dev,
 		clock_root = kCLOCK_Root_Bus + instance;
 		break;
 #endif
+
+#ifdef CONFIG_ADC_MCUX_LPADC
+	case IMX_CCM_LPADC1_CLK:
+		clock_root = kCLOCK_Root_Adc1 + instance;
+		break;
+#endif
 	default:
 		return -EINVAL;
 	}

drivers/clock_control/clock_control_mcux_syscon.c

@@ -297,6 +297,21 @@ static int mcux_lpc_syscon_clock_control_get_subsys_rate(
 		*rate = CLOCK_GetLcdClkFreq();
 		break;
 #endif
+
+#if defined(CONFIG_ADC_MCUX_LPADC)
+	case MCUX_LPADC1_CLK:
+#if (FSL_FEATURE_SOC_LPADC_COUNT == 1)
+		*rate = CLOCK_GetAdcClkFreq();
+#else
+		*rate = CLOCK_GetAdcClkFreq(0);
+#endif
+		break;
+#if (FSL_FEATURE_SOC_LPADC_COUNT == 2)
+	case MCUX_LPADC2_CLK:
+		*rate = CLOCK_GetAdcClkFreq(1);
+		break;
+#endif
+#endif /* CONFIG_ADC_MCUX_LPADC */
 	}
 
 	return 0;

include/zephyr/dt-bindings/clock/imx_ccm_rev2.h

@@ -99,4 +99,8 @@
 #define IMX_CCM_PIT_CLK                 0x5000UL
 #define IMX_CCM_PIT1_CLK                0x5001UL
 
+/* ADC */
+#define IMX_CCM_LPADC1_CLK	0x6000UL
+#define IMX_CCM_LPADC2_CLK	0x6001UL
+
 #endif /* ZEPHYR_INCLUDE_DT_BINDINGS_CLOCK_IMX_CCM_REV2_H_ */

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

@@ -78,4 +78,7 @@
 
 #define MCUX_LCDIC_CLK			MCUX_LPC_CLK_ID(0x0E, 0x00)
 
+#define MCUX_LPADC1_CLK			MCUX_LPC_CLK_ID(0x0F, 0x00)
+#define MCUX_LPADC2_CLK			MCUX_LPC_CLK_ID(0x0F, 0x01)
+
 #endif /* ZEPHYR_INCLUDE_DT_BINDINGS_CLOCK_MCUX_LPC_SYSCON_H_ */