arm64: dts: amlogic: meson-s4: add internal SARADC controller

Add the SARADC (Successive Approximation Register ADC) controller
node to the Meson S4 SoC dtsi.

It uses the S4-specific compatible string with a fallback to the
G12A generation, as there are no known hardware differences.

Reviewed-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Nick Xie <nick@khadas.com>
Link: https://patch.msgid.link/20260325070618.81955-4-nick@khadas.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

Author: numbqq

arch/arm64/boot/dts/amlogic/meson-s4.dtsi

@@ -77,6 +77,20 @@
 		};
 	};
 
+	saradc: adc@fe026000 {
+		compatible = "amlogic,meson-s4-saradc",
+			     "amlogic,meson-g12a-saradc";
+		reg = <0x0 0xfe026000 0x0 0x48>;
+		#io-channel-cells = <1>;
+		interrupts = <GIC_SPI 181 IRQ_TYPE_EDGE_RISING>;
+		clocks = <&xtal>,
+			 <&clkc_periphs CLKID_SAR_ADC>,
+			 <&clkc_periphs CLKID_SARADC>,
+			 <&clkc_periphs CLKID_SARADC_SEL>;
+		clock-names = "clkin", "core", "adc_clk", "adc_sel";
+		status = "disabled";
+	};
+
 	soc {
 		compatible = "simple-bus";
 		#address-cells = <2>;