[PATCH] staging: Documentation: dds: replace frequencyY with frequency

[Abinash Singh <abinashsinghlalotra@gmail.com>]

From: Abinash Singh <abinashlalotra@gmail.com>

The documented frequencyY attribute naming is implementation
specific and differs from common IIO sysfs attribute
conventions.

Replace the non-standard frequencyY attribute documentation with
out_altvoltageX_frequency and document tuning word selection
through out_altvoltageX_frequencysymbol

This makes the documented ABI naming consistent with standard
IIO sysfs attribute conventions and clarifies how tuning word
registers are selected and programmed.


Signed-off-by: Abinash Singh <abinashlalotra@gmail.com>
---

The out_altvoltageX_frequencysymbol and
out_altvoltageX_frequency_scale attributes can be added
through extended channel attributes (.ext_info in channel_spec struct of IIO)

Feedback on this approach would be appreciated, and if
there is some other way in your mind. I would like to 
work on that.

I am also interested in working on the sysfs-bus-iio-dds
documentation and the ad9834 driver. I recently bought an
AD9833 IC for experimentation and testing.

Thanks

 .../iio/Documentation/sysfs-bus-iio-dds       | 31 ++++++++++---------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/drivers/staging/iio/Documentation/sysfs-bus-iio-dds b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds
index ee8c509c6733..dfc6ae3964d1 100644
--- a/drivers/staging/iio/Documentation/sysfs-bus-iio-dds
+++ b/drivers/staging/iio/Documentation/sysfs-bus-iio-dds
@@ -1,33 +1,34 @@
 
-What:		/sys/bus/iio/devices/.../out_altvoltageX_frequencyY
+What:		/sys/bus/iio/devices/.../out_altvoltageX_frequency
 KernelVersion:	2.6.37
 Contact:	linux-iio@vger.kernel.org
 Description:
-		Stores frequency into tuning word Y.
-		There will be more than one out_altvoltageX_frequencyY file,
-		which allows for pin controlled FSK Frequency Shift Keying
-		(out_altvoltageX_pincontrol_frequency_en is active) or the user
-		can control the desired active tuning word by writing Y to the
+		Stores frequency into active tuning word register.
+		To select active tuning word register, the user
+		must write the desired index to the
 		out_altvoltageX_frequencysymbol file.
+		For pin controlled FSK (Frequency Shift Keying),
+		tuning word registers must be loaded by selecting
+		each via out_altvoltageX_frequencysymbol before enabling
+		out_altvoltageX_pincontrol_frequency_en.
 
-What:		/sys/bus/iio/devices/.../out_altvoltageX_frequencyY_scale
+What:		/sys/bus/iio/devices/.../out_altvoltageX_frequency_scale
 KernelVersion:	2.6.37
 Contact:	linux-iio@vger.kernel.org
 Description:
-		Scale to be applied to out_altvoltageX_frequencyY in order to
-		obtain the desired value in Hz. If shared across all frequency
-		registers Y is not present. It is also possible X is not present
+		Scale to be applied to out_altvoltageX_frequency in order to
+		obtain the desired value in Hz. It is also possible X is not present
 		if shared across all channels.
 
 What:		/sys/bus/iio/devices/.../out_altvoltageX_frequencysymbol
 KernelVersion:	2.6.37
 Contact:	linux-iio@vger.kernel.org
 Description:
-		Specifies the active output frequency tuning word. The value
-		corresponds to the Y in out_altvoltageX_frequencyY.
-		To exit this mode the user can write
-		out_altvoltageX_pincontrol_frequency_en or
-		out_altvoltageX_out_enable file.
+		Specifies the active output frequency tuning word index.
+		Writing an index here selects which tuning word register
+		is written by out_altvoltageX_frequency. To exit this mode
+		the user can write out_altvoltageX_pincontrol_frequency_en
+		or out_altvoltageX_out_enable file.
 
 What:		/sys/bus/iio/devices/.../out_altvoltageX_phaseY
 KernelVersion:	2.6.37
-- 
2.43.0