iio: frequency: adf4350: Add support for dt bindings

Per review feedback from Lars-Peter Clausen <lars@metafoo.de>
Changes since V1:
	Fix return value handling of adf4350_parse_dt()
	Use of_get_gpio
	Avoid abbreviations in devicetree properties
	Fix typo in docs

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

1 files changed, 86 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/iio/frequency/adf4350.txt b/Documentation/devicetree/bindings/iio/frequency/adf4350.txt
new file mode 100644
index 000000000000..f8c181d81d2d
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/frequency/adf4350.txt
@@ -0,0 +1,86 @@
+Analog Devices ADF4350/ADF4351 device driver
+
+Required properties:
+	- compatible: Should be one of
+		* "adi,adf4350": When using the ADF4350 device
+		* "adi,adf4351": When using the ADF4351 device
+	- reg: SPI chip select numbert for the device
+	- spi-max-frequency: Max SPI frequency to use (< 20000000)
+	- clocks: From common clock binding. Clock is phandle to clock for
+		ADF435x Reference Clock (CLKIN).
+
+Optional properties:
+	- gpios:	 GPIO Lock detect - If set with a valid phandle and GPIO number,
+			pll lock state is tested upon read.
+	- adi,channel-spacing: Channel spacing in Hz (influences MODULUS).
+	- adi,power-up-frequency:	If set in Hz the PLL tunes to
+			the desired frequency on probe.
+	- adi,reference-div-factor: If set the driver skips dynamic calculation
+			and uses this default value instead.
+	- adi,reference-doubler-enable: Enables reference doubler.
+	- adi,reference-div2-enable: Enables reference divider.
+	- adi,phase-detector-polarity-positive-enable: Enables positive phase
+			detector polarity. Default = negative.
+	- adi,lock-detect-precision-6ns-enable: Enables 6ns lock detect precision.
+			Default = 10ns.
+	- adi,lock-detect-function-integer-n-enable: Enables lock detect
+			for integer-N mode. Default = factional-N mode.
+	- adi,charge-pump-current: Charge pump current in mA.
+			Default = 2500mA.
+	- adi,muxout-select: On chip multiplexer output selection.
+			Valid values for the multiplexer output are:
+			0: Three-State Output (default)
+			1: DVDD
+			2: DGND
+			3: R-Counter output
+			4: N-Divider output
+			5: Analog lock detect
+			6: Digital lock detect
+	- adi,low-spur-mode-enable: Enables low spur mode.
+			Default = Low noise mode.
+	- adi,cycle-slip-reduction-enable: Enables cycle slip reduction.
+	- adi,charge-cancellation-enable: Enabled charge pump
+			charge cancellation for integer-N modes.
+	- adi,anti-backlash-3ns-enable: Enables 3ns antibacklash pulse width
+			 for integer-N modes.
+	- adi,band-select-clock-mode-high-enable: Enables faster band
+			selection logic.
+	- adi,12bit-clk-divider: Clock divider value used when
+			adi,12bit-clkdiv-mode != 0
+	- adi,clk-divider-mode:
+			Valid values for the clkdiv mode are:
+			0: Clock divider off (default)
+			1: Fast lock enable
+			2: Phase resync enable
+	- adi,aux-output-enable: Enables auxiliary RF output.
+	- adi,aux-output-fundamental-enable: Selects fundamental VCO output on
+			the auxiliary RF output. Default = Output of RF dividers.
+	- adi,mute-till-lock-enable: Enables Mute-Till-Lock-Detect function.
+	- adi,output-power: Output power selection.
+			Valid values for the power mode are:
+			0: -4dBm (default)
+			1: -1dBm
+			2: +2dBm
+			3: +5dBm
+	- adi,aux-output-power: Auxiliary output power selection.
+			Valid values for the power mode are:
+			0: -4dBm (default)
+			1: -1dBm
+			2: +2dBm
+			3: +5dBm
+
+
+Example:
+		lo_pll0_rx_adf4351: adf4351-rx-lpc@4 {
+			compatible = "adi,adf4351";
+			reg = <4>;
+			spi-max-frequency = <10000000>;
+			clocks = <&clk0_ad9523 9>;
+			clock-names = "clkin";
+			adi,channel-spacing = <10000>;
+			adi,power-up-frequency = <2400000000>;
+			adi,phase-detector-polarity-positive-enable;
+			adi,charge-pump-current = <2500>;
+			adi,output-power = <3>;
+			adi,mute-till-lock-enable;
+		};