ARM: dts: at91: sama5d2: add adc device

Add the ADC device, and remove the adc_op_clk which is useless since the
adc sampling frequency is configured with sysfs.
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

arch/arm/boot/dts/sama5d2.dtsi

@@ -88,12 +88,6 @@ main_xtal: main_xtal {
 			#clock-cells = <0>;
 			clock-frequency = <0>;
 		};
-
-		adc_op_clk: adc_op_clk{
-			compatible = "fixed-clock";
-			#clock-cells = <0>;
-			clock-frequency = <1000000>;
-		};
 	};
 
 	ns_sram: sram@00200000 {
@@ -1085,6 +1079,18 @@ AT91_XDMAC_DT_PERID(2))>,
 				status = "disabled";
 			};
 
+			adc: adc@fc030000 {
+				compatible = "atmel,sama5d2-adc";
+				reg = <0xfc030000 0x100>;
+				interrupts = <40 IRQ_TYPE_LEVEL_HIGH 7>;
+				clocks = <&adc_clk>;
+				clock-names = "adc_clk";
+				atmel,min-sample-rate-hz = <200000>;
+				atmel,max-sample-rate-hz = <20000000>;
+				atmel,startup-time-ms = <4>;
+				status = "disabled";
+			};
+
 			pioA: pinctrl@fc038000 {
 				compatible = "atmel,sama5d2-pinctrl";
 				reg = <0xfc038000 0x600>;