iio: frequency: New driver for Analog Devices ADF4350/ADF4351 Wideband Synthesizers
Changes since V1:
Apply Jonathan's review feedback:
Introduce and use IIO_ALTVOLTAGE.
Fix up comments and documentation.
Remove dead code.
Reorder some code fragments.
Add missing iio_device_free.
Convert to new API.
Fix-up out of staging includes.
Removed pll_locked attribute.
Changes since V2:
Use module_spi_driver.
adf4350_remove: move gpio_free after regulator.
target patch to drivers/iio
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/Documentation/ABI/testing/sysfs-bus-iio-frequency-adf4350 b/Documentation/ABI/testing/sysfs-bus-iio-frequency-adf4350
new file mode 100644
index 0000000..d89aded
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-frequency-adf4350
@@ -0,0 +1,21 @@
+What: /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_frequency_resolution
+KernelVersion: 3.4.0
+Contact: linux-iio@vger.kernel.org
+Description:
+ Stores channel Y frequency resolution/channel spacing in Hz.
+ The value given directly influences the MODULUS used by
+ the fractional-N PLL. It is assumed that the algorithm
+ that is used to compute the various dividers, is able to
+ generate proper values for multiples of channel spacing.
+
+What: /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_refin_frequency
+KernelVersion: 3.4.0
+Contact: linux-iio@vger.kernel.org
+Description:
+ Sets channel Y REFin frequency in Hz. In some clock chained
+ applications, the reference frequency used by the PLL may
+ change during runtime. This attribute allows the user to
+ adjust the reference frequency accordingly.
+ The value written has no effect until out_altvoltageY_frequency
+ is updated. Consider to use out_altvoltageY_powerdown to power
+ down the PLL and it's RFOut buffers during REFin changes.