boards: arm: lpcxpresso55s36: Added dac support for LPC55S36

Added dac support for the LPC55S36 board, updated lpc55xxx/soc.c to
enable clock and power for dac0.

Signed-off-by: Albort Xue <yao.xue@nxp.com>

boards/arm/lpcxpresso55s36/doc/index.rst

@@ -81,6 +81,8 @@ already supported, which can also be re-used on this lpcxpresso55s36 board:
 +-----------+------------+-------------------------------------+
 | USB FS    | on-chip    | USB Full Speed device               |
 +-----------+------------+-------------------------------------+
+| DAC       | on-chip    | dac                                 |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not currently enabled.
 

boards/arm/lpcxpresso55s36/lpcxpresso55s36-pinctrl.dtsi

@@ -2,7 +2,7 @@
  * NOTE: File generated by lpc_cfg_utils.py
  * from LPC55S36.mex
  *
- * Copyright 2022 NXP
+ * Copyright 2022-2023 NXP
  * SPDX-License-Identifier: Apache-2.0
  */
 
@@ -119,4 +119,12 @@
 			slew-rate = "standard";
 		};
 	};
+
+	pinmux_dac0: pinmux_dac0 {
+		group0 {
+			pinmux = <DAC0_OUT_PIO1_22>;
+			slew-rate = "standard";
+			nxp,analog-mode;
+		};
+	};
 };

boards/arm/lpcxpresso55s36/lpcxpresso55s36.dts

@@ -175,3 +175,9 @@ zephyr_udc0: &usbfs {
 &dma0 {
 	status = "okay";
 };
+
+&dac0 {
+	status = "okay";
+	pinctrl-0 = <&pinmux_dac0>;
+	pinctrl-names = "default";
+};

boards/arm/lpcxpresso55s36/lpcxpresso55s36.yaml

@@ -18,3 +18,4 @@ supported:
   - can
   - gpio
   - pwm
+  - dac

dts/arm/nxp/nxp_lpc55S3x_common.dtsi

@@ -294,6 +294,33 @@
 		dma-names = "adc0-dma0", "adc0-dma1";
 	};
 
+	dac0: dac@b2000 {
+		compatible = "nxp,lpdac";
+		reg = < 0xb2000 0x1000>;
+		interrupts = <74 0>;
+		status = "disabled";
+		voltage-reference = <0>;
+		#io-channel-cells = <1>;
+	};
+
+	dac1: dac@b6000 {
+		compatible = "nxp,lpdac";
+		reg = < 0xb6000 0x1000>;
+		interrupts = <75 0>;
+		status = "disabled";
+		voltage-reference = <0>;
+		#io-channel-cells = <1>;
+	};
+
+	dac2: dac@b9000 {
+		compatible = "nxp,lpdac";
+		reg = < 0xb9000 0x1000>;
+		interrupts = <76 0>;
+		status = "disabled";
+		voltage-reference = <0>;
+		#io-channel-cells = <1>;
+	};
+
 	can0: can@4009d000 {
 		compatible = "nxp,lpc-mcan";
 		reg = <0x4009d000 0x1000>;

soc/arm/nxp_lpc/lpc55xxx/soc.c

@@ -31,7 +31,8 @@
 #include "usb_phy.h"
 #include "usb.h"
 #endif
-#if defined(CONFIG_SOC_LPC55S36) && defined(CONFIG_ADC_MCUX_LPADC)
+#if defined(CONFIG_SOC_LPC55S36) && (defined(CONFIG_ADC_MCUX_LPADC) \
+	|| defined(CONFIG_DAC_MCUX_LPDAC))
 #include <fsl_vref.h>
 #endif
 
@@ -322,8 +323,26 @@ DT_FOREACH_STATUS_OKAY(nxp_lpc_ctimer, CTIMER_CLOCK_SETUP)
 #if defined(CONFIG_SOC_LPC55S36)
 	CLOCK_SetClkDiv(kCLOCK_DivAdc0Clk, 2U, true);
 	CLOCK_AttachClk(kFRO_HF_to_ADC0);
+#else
+	CLOCK_SetClkDiv(kCLOCK_DivAdcAsyncClk,
+			DT_PROP(DT_NODELABEL(adc0), clk_divider), true);
+	CLOCK_AttachClk(MUX_A(CM_ADCASYNCCLKSEL, DT_PROP(DT_NODELABEL(adc0), clk_source)));
 
-#if defined(CONFIG_ADC_MCUX_LPADC)
+	/* Power up the ADC */
+	POWER_DisablePD(kPDRUNCFG_PD_LDOGPADC);
+#endif
+#endif
+#if DT_NODE_HAS_COMPAT_STATUS(DT_NODELABEL(dac0), nxp_lpdac, okay)
+#if defined(CONFIG_SOC_LPC55S36)
+	CLOCK_SetClkDiv(kCLOCK_DivDac0Clk, 1U, true);
+	CLOCK_AttachClk(kMAIN_CLK_to_DAC0);
+
+	/* Disable DAC0 power down */
+	POWER_DisablePD(kPDRUNCFG_PD_DAC0);
+#endif
+#endif
+#if defined(CONFIG_SOC_LPC55S36)
+#if (defined(CONFIG_ADC_MCUX_LPADC) || defined(CONFIG_DAC_MCUX_LPDAC))
 	/* Vref is required for LPADC reference */
 	POWER_DisablePD(kPDRUNCFG_PD_VREF);
 
@@ -335,14 +354,6 @@ DT_FOREACH_STATUS_OKAY(nxp_lpc_ctimer, CTIMER_CLOCK_SETUP)
 	vrefConfig.enableVrefOut                  = true;
 	VREF_Init((VREF_Type *)VREF_BASE, &vrefConfig);
 #endif
-#else
-	CLOCK_SetClkDiv(kCLOCK_DivAdcAsyncClk,
-			DT_PROP(DT_NODELABEL(adc0), clk_divider), true);
-	CLOCK_AttachClk(MUX_A(CM_ADCASYNCCLKSEL, DT_PROP(DT_NODELABEL(adc0), clk_source)));
-
-	/* Power up the ADC */
-	POWER_DisablePD(kPDRUNCFG_PD_LDOGPADC);
-#endif
 #endif
 }