ARM: dts: meson: add the SAR ADC

This adds the SAR ADC to meson.dtsi and configures the clocks on Meson8
and Meson8b to allow boards to use it. Some boards use it to connect a
button to it.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>

arch/arm/boot/dts/meson.dtsi

@@ -103,6 +103,14 @@ i2c_A: i2c@8500 {
 				status = "disabled";
 			};
 
+			saradc: adc@8680 {
+				compatible = "amlogic,meson-saradc";
+				reg = <0x8680 0x34>;
+				#io-channel-cells = <1>;
+				interrupts = <GIC_SPI 73 IRQ_TYPE_EDGE_RISING>;
+				status = "disabled";
+			};
+
 			uart_C: serial@8700 {
 				compatible = "amlogic,meson-uart";
 				reg = <0x8700 0x18>;

arch/arm/boot/dts/meson8.dtsi

@@ -232,6 +232,14 @@ &L2 {
 	arm,filter-ranges = <0x100000 0xc0000000>;
 };
 
+&saradc {
+	compatible = "amlogic,meson8-saradc", "amlogic,meson-saradc";
+	clocks = <&clkc CLKID_XTAL>,
+		<&clkc CLKID_SAR_ADC>,
+		<&clkc CLKID_SANA>;
+	clock-names = "clkin", "core", "sana";
+};
+
 &spifc {
 	clocks = <&clkc CLKID_CLK81>;
 };

arch/arm/boot/dts/meson8b.dtsi

@@ -177,6 +177,14 @@ &L2 {
 	arm,filter-ranges = <0x100000 0xc0000000>;
 };
 
+&saradc {
+	compatible = "amlogic,meson8b-saradc", "amlogic,meson-saradc";
+	clocks = <&clkc CLKID_XTAL>,
+		<&clkc CLKID_SAR_ADC>,
+		<&clkc CLKID_SANA>;
+	clock-names = "clkin", "core", "sana";
+};
+
 &uart_AO {
 	clocks = <&clkc CLKID_CLK81>;
 };