iio: frequency: adf41513: driver implementation

The driver is based on existing PLL drivers in the IIO subsystem and
implements the following key features:

- Integer-N and fractional-N (fixed/variable modulus) synthesis modes;
- High-resolution frequency calculations using microhertz (µHz) precision
  to handle sub-Hz resolution across multi-GHz frequency ranges;
- IIO debugfs interface for direct register access;
- FW property parsing from devicetree including charge pump settings and
  reference path configuration;
- Power management support with suspend/resume callbacks;
- Lock detect GPIO monitoring.

Signed-off-by: Rodrigo Alencar <rodrigo.alencar@analog.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

MAINTAINERS

@@ -1708,6 +1708,7 @@ L:	linux-iio@vger.kernel.org
 S:	Supported
 W:	https://ez.analog.com/linux-software-drivers
 F:	Documentation/devicetree/bindings/iio/frequency/adi,adf41513.yaml
+F:	drivers/iio/frequency/adf41513.c
 
 ANALOG DEVICES INC ADF4377 DRIVER
 M:	Antoniu Miclaus <antoniu.miclaus@analog.com>

drivers/iio/frequency/Kconfig

@@ -29,6 +29,16 @@ endmenu
 
 menu "Phase-Locked Loop (PLL) frequency synthesizers"
 
+config ADF41513
+	tristate "Analog Devices ADF41513 PLL Frequency Synthesizer"
+	depends on SPI
+	help
+	  Say yes here to build support for Analog Devices ADF41513
+	  26.5 GHz Integer-N/Fractional-N PLL Frequency Synthesizer.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called adf41513.
+
 config ADF4350
 	tristate "Analog Devices ADF4350/ADF4351 Wideband Synthesizers"
 	depends on SPI

drivers/iio/frequency/Makefile

@@ -5,6 +5,7 @@
 
 # When adding new entries keep the list in alphabetical order
 obj-$(CONFIG_AD9523) += ad9523.o
+obj-$(CONFIG_ADF41513) += adf41513.o
 obj-$(CONFIG_ADF4350) += adf4350.o
 obj-$(CONFIG_ADF4371) += adf4371.o
 obj-$(CONFIG_ADF4377) += adf4377.o