Re: [PATCH] iio: documentation: Add out_altvoltage and friends

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On 05/02/2012 04:36 PM, Jonathan Cameron wrote:
On 5/2/2012 12:24 PM, michael.hennerich@xxxxxxxxxx wrote:
From: Michael Hennerich<michael.hennerich@xxxxxxxxxx>

Continuous frequency/clock generating devices, such as DDSs or PLLs
should use out_altvolatge.

Signed-off-by: Michael Hennerich<michael.hennerich@xxxxxxxxxx>
---
   Documentation/ABI/testing/sysfs-bus-iio |   31 +++++++++++++++++++++++++++++++
   1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/Documentation/ABI/testing/sysfs-bus-iio b/Documentation/ABI/testing/sysfs-bus-iio
index 2ce4dad..f757a30 100644
--- a/Documentation/ABI/testing/sysfs-bus-iio
+++ b/Documentation/ABI/testing/sysfs-bus-iio
@@ -219,6 +219,7 @@ What:             /sys/bus/iio/devices/iio:deviceX/in_voltageY_scale
   What:               /sys/bus/iio/devices/iio:deviceX/in_voltageY_supply_scale
   What:               /sys/bus/iio/devices/iio:deviceX/in_voltage_scale
   What:               /sys/bus/iio/devices/iio:deviceX/out_voltageY_scale
+What:                /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_scale
   What:               /sys/bus/iio/devices/iio:deviceX/in_accel_scale
   What:               /sys/bus/iio/devices/iio:deviceX/in_accel_peak_scale
   What:               /sys/bus/iio/devices/iio:deviceX/in_anglvel_scale
@@ -273,6 +274,7 @@ What:             /sys/bus/iio/devices/iio:deviceX/in_accel_scale_available
   What:               /sys/.../iio:deviceX/in_voltageX_scale_available
   What:               /sys/.../iio:deviceX/in_voltage-voltage_scale_available
   What:               /sys/.../iio:deviceX/out_voltageX_scale_available
+What:                /sys/.../iio:deviceX/out_altvoltageX_scale_available
   What:               /sys/.../iio:deviceX/in_capacitance_scale_available
   KernelVersion:      2.635
   Contact:    linux-iio@xxxxxxxxxxxxxxx
@@ -291,14 +293,19 @@ Description:
               gives the 3dB frequency of the filter in Hz.

   What:               /sys/bus/iio/devices/iio:deviceX/out_voltageY_raw
+What:                /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_raw
   KernelVersion:      2.6.37
   Contact:    linux-iio@xxxxxxxxxxxxxxx
   Description:
               Raw (unscaled, no bias etc.) output voltage for
               channel Y.  The number must always be specified and
               unique if the output corresponds to a single channel.
+             While DAC like devices typically use out_voltage,
+             a continuous frequency generating device, such as
+             a DDS or PLL should use out_altvolatge.

   What:               /sys/bus/iio/devices/iio:deviceX/out_voltageY&Z_raw
+What:                /sys/bus/iio/devices/iio:deviceX/out_altvoltageY&Z_raw
   KernelVersion:      2.6.37
   Contact:    linux-iio@xxxxxxxxxxxxxxx
   Description:
@@ -309,6 +316,8 @@ Description:

   What:               /sys/bus/iio/devices/iio:deviceX/out_voltageY_powerdown_mode
   What:               /sys/bus/iio/devices/iio:deviceX/out_voltage_powerdown_mode
+What:                /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_powerdown_mode
+What:                /sys/bus/iio/devices/iio:deviceX/out_altvoltage_powerdown_mode
   KernelVersion:      2.6.38
   Contact:    linux-iio@xxxxxxxxxxxxxxx
   Description:
@@ -323,6 +332,8 @@ Description:

   What:               /sys/.../iio:deviceX/out_votlageY_powerdown_mode_available
   What:               /sys/.../iio:deviceX/out_voltage_powerdown_mode_available
+What:                /sys/.../iio:deviceX/out_altvotlageY_powerdown_mode_available
+What:                /sys/.../iio:deviceX/out_altvoltage_powerdown_mode_available
   KernelVersion:      2.6.38
   Contact:    linux-iio@xxxxxxxxxxxxxxx
   Description:
@@ -331,6 +342,8 @@ Description:

   What:               /sys/bus/iio/devices/iio:deviceX/out_voltageY_powerdown
   What:               /sys/bus/iio/devices/iio:deviceX/out_voltage_powerdown
+What:                /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_powerdown
+What:                /sys/bus/iio/devices/iio:deviceX/out_altvoltage_powerdown
   KernelVersion:      2.6.38
   Contact:    linux-iio@xxxxxxxxxxxxxxx
   Description:
@@ -339,6 +352,24 @@ Description:
               normal operation. Y may be suppressed if all outputs are
               controlled together.

+What:                /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_frequency
+KernelVersion:       3.4.0
+Contact:     linux-iio@xxxxxxxxxxxxxxx
+Description:
+             Output frequency for channel Y in Hz. The number must always be
+             specified and unique if the output corresponds to a single
+             channel.
+
+What:                /sys/bus/iio/devices/iio:deviceX/out_altvoltageY_phase
+KernelVersion:       3.4.0
+Contact:     linux-iio@xxxxxxxxxxxxxxx
+Description:
+             Phase in radians of one frequency/clock output Y
+             (out_altvoltageY) relative to another frequency/clock output
+             (out_altvoltageZ) of the device X. The number must always be
+             specified and unique if the output corresponds to a single
+             channel.
+
Do we need a way of specifying which channel is channel z?  e.g. what
this is relative to?  Or do
we always assume it is relative to the channel 0?
Right now it's assumed it's relative to a channel that sets
phase to 0.

The device in mind is a clock distribution IC featuring 14 channels.
Each channel can be given a phase offset. When the device is put
into SYNC, either a external supplied pulse, or by writing an
sysfs attribute, the state machine starts the channels with
it's dedicated phase offset.

Side questions. Radian is a SI derived unit, however dealing with
fractions and multiples of PI is a bit suboptimal within the kernel.

Do you mind if we make phase use degrees or grads?


Rest are fine.
   What:               /sys/bus/iio/devices/iio:deviceX/events
   KernelVersion:      2.6.35
   Contact:    linux-iio@xxxxxxxxxxxxxxx
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Greetings,
Michael

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