boards: s32z2xxdc2: add support for adc

Add devicetree of adc instances for s32z270.

Signed-off-by: Ha Duong Quang <ha.duongquang@nxp.com>

boards/nxp/s32z2xxdc2/doc/index.rst

@@ -55,6 +55,8 @@ The boards support the following hardware features:
 +-----------+------------+-------------------------------------+
 | FLEXCAN   | on-chip    | can                                 |
 +-----------+------------+-------------------------------------+
+| SAR_ADC   | on-chip    | adc                                 |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not currently supported by the port.
 
@@ -150,6 +152,15 @@ FlexCAN
 
 FlexCAN supports CAN Classic (CAN 2.0) and CAN FD modes.
 
+ADC
+===
+
+ADC is provided through ADC SAR controller with 2 instances. Each ADC SAR instance has
+12-bit resolution. ADC channels are divided into 2 groups (precision and internal/standard).
+
+.. note::
+   All channels of an instance only run on 1 group channel at the same time.
+
 Programming and Debugging
 *************************
 

boards/nxp/s32z2xxdc2/s32z2xxdc2_s32z270.dtsi

@@ -50,3 +50,11 @@
 	pinctrl-0 = <&flexcan1_default>;
 	pinctrl-names = "default";
 };
+
+&sar_adc0 {
+	vref-mv = <1800>;
+};
+
+&sar_adc1 {
+	vref-mv = <1800>;
+};

boards/nxp/s32z2xxdc2/s32z2xxdc2_s32z270_rtu0.yaml

@@ -16,4 +16,5 @@ supported:
   - can
   - spi
   - counter
+  - adc
 vendor: nxp

boards/nxp/s32z2xxdc2/s32z2xxdc2_s32z270_rtu0_D.yaml

@@ -16,4 +16,5 @@ supported:
   - can
   - spi
   - counter
+  - adc
 vendor: nxp

boards/nxp/s32z2xxdc2/s32z2xxdc2_s32z270_rtu1.yaml

@@ -16,4 +16,5 @@ supported:
   - can
   - spi
   - counter
+  - adc
 vendor: nxp

boards/nxp/s32z2xxdc2/s32z2xxdc2_s32z270_rtu1_D.yaml

@@ -16,4 +16,5 @@ supported:
   - can
   - spi
   - counter
+  - adc
 vendor: nxp