linux-kernel - [PATCH v4 2/3] Documentation/ABI/testing: Add documentation for AD5766 new ABI

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Date:   Fri, 18 Dec 2020 19:12:30 +0200
From:   Cristian Pop <cristian.pop@...log.com>
To:     <linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <jic23@...nel.org>, <devicetree@...r.kernel.org>,
        Cristian Pop <cristian.pop@...log.com>
Subject: [PATCH v4 2/3] Documentation/ABI/testing: Add documentation for AD5766 new ABI

New interface is proposed for dither functionality. This future allows
composing  an external signals to the selected output channel.
The dither signal can be turned on/off, scaled, inverted, or it can be
selected from different sources.

Signed-off-by: Cristian Pop <cristian.pop@...log.com>
---
Changelog v4:
	- Change to "in_voltageY_dither_enable"
	- Change scale to numbers + 100% for no scaling
	- Possible dither source values: 0 - N0, 1 - N1 
 .../ABI/testing/sysfs-bus-iio-dac-ad5766      | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766 b/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766
new file mode 100644
index 000000000000..72100edb88bb
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766
@@ -0,0 +1,36 @@
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_pwr
+KernelVersion:
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Dither enable. Write 1 to enable dither or 0 to disable it.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_invert
+KernelVersion:
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Inverts the dither applied to the selected DAC channel. Dither is not
+		inverted by default. Write "1" to invert dither.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_scale_available
+KernelVersion:
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Returns possible scalings available for the current channel:
+		"100 75 50 25" scaling.
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_scale
+KernelVersion:
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Scales the dither before it is applied to the selected channel:
+		100 - No scaling
+		75 - 75% scaling
+		50 - 50% scaling
+		25 - 25% scaling
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_source
+KernelVersion:
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Selects dither source applied to the selected channel. Write "0" to
+		select N0 source, write "1" to select N1 source.
-- 
2.17.1