linux-kernel - [PATCH v3 2/3] Documentation/ABI/testing: Add documentation for AD5766 new ABI

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Message-ID: <20201208131957.34381-2-cristian.pop@analog.com>
Date:   Tue, 8 Dec 2020 15:19:56 +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>,
        <robh+dt@...nel.org>, Cristian Pop <cristian.pop@...log.com>
Subject: [PATCH v3 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>
---
 .../ABI/testing/sysfs-bus-iio-dac-ad5766      | 45 +++++++++++++++++++
 1 file changed, 45 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..361bbd0862df
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-dac-ad5766
@@ -0,0 +1,45 @@
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_pwr
+KernelVersion:
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Dither power on/off. Write 0 to power on dither or 1 to power it off.
+
+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 signal is
+		not inverted (default) Dither signal is inverted.
+
+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:
+		"NO_SCALING 75%_SCALING 50%_SCALING 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.
+		NO_SCALING - No scaling
+		75%_SCALING - 75% scaling
+		50%_SCALING - 50% scaling
+		25%_SCALING - 25% scaling
+
+What:		/sys/bus/iio/devices/iio:deviceX/in_voltageY_dither_source_available
+KernelVersion:
+Contact:	linux-iio@...r.kernel.org
+Description:
+		Returns possible dither sources available for the selected channel:
+		"NO_DITHER N0 N1"
+
+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.
+		NO_DITHER - No dither applied
+		N0 - N0 dither signal applied
+		N1 - N1 dither signal applied
-- 
2.17.1