* Amlogic Meson SAR (Successive Approximation Register) A/D converter

Required properties:
- compatible:	depending on the SoC this should be one of:
			- "amlogic,meson-g12a-saradc" for G12A
			- "amlogic,meson-txlx-saradc" for TXLX
			- "amlogic,meson-axg-saradc" for AXG
			- "amlogic,meson-txl-saradc" for TXL
			- "amlogic,meson-gxl-saradc" for GXL
			- "amlogic,meson-gxm-saradc" for GXM
			- "amlogic,meson-m8b-saradc" for M8B
along with the generic "amlogic,meson-saradc"

- reg:		the physical base address and length of the registers

- interrupts:	the interrupt indicating end of sampling

- clocks:	phandle and clock identifier (see clock-names)

- clock-names:	mandatory clocks:
			- "xtal" for the reference clock (typically XTAL)
			- "saradc_clk" for the SAR ADC (sampling) clock
		optional clocks:
			- "clk81_gate" for the clk81 clock gate

- #io-channel-cells: must be 1, see ../iio-bindings.txt

Optional properties:
- status: Shall be "ok" or "okay" if enabled or "disabled" if disabled.
		  Default is "ok".

Example:
saradc:saradc {
	compatible = "amlogic,meson-axg-saradc";
	status = "okay";
	#io-channel-cells = <1>;
	clocks = <&xtal>, <&clkc CLKID_SARADC_GATE>;
	clock-names = "xtal", "saradc_clk";
	interrupts = <GIC_SPI 73 IRQ_TYPE_EDGE_RISING>;
	reg = <0x0 0xff809000 0x0 0x38>;
}
