[PATCH 2/3] iio: ABI: add ABI file for the LTC2688 DAC

["Nuno Sá" <nuno.sa@analog.com>]

Define the sysfs interface for toggle or dither capable channels. Dither
capable channels will have the extended interface:

 * out_voltageY_dither_en
 * out_voltageY_dither_raw
 * out_voltageY_dither_raw_available
 * out_voltageY_dither_frequency
 * out_voltageY_dither_frequency_available
 * out_voltageY_dither_phase
 * out_voltageY_dither_phase_available

Toggle enabled channels will have:

 * out_voltageY_toggle_en
 * out_voltageY_raw1
 * out_voltageY_symbol

Signed-off-by: Nuno Sá <nuno.sa@analog.com>
---
 .../ABI/testing/sysfs-bus-iio-dac-ltc2688     | 67 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 68 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2688

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2688 b/Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2688
new file mode 100644
index 000000000000..0c45de94dd75
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2688
@@ -0,0 +1,67 @@
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_en
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Dither enable. Write 1 to enable dither or 0 to disable it.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_raw
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		This raw, unscaled value refers to the dither signal amplitude.
+		The same scale as in out_voltageY_raw applies. However, the
+		offset might be different as it's always 0 for this attribute.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_raw_available
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Available range for dither raw amplitude values.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_frequency
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Sets the dither signal frequency.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_frequency_available
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Returns the available values for the dither frequency.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_phase
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Sets the dither signal phase.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_dither_phase_available
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Returns the available values for the dither phase.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_toggle_en
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Toggle enable. Write 1 to enable toggle or 0 to disable it.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_raw1
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		It has the same meaning as out_voltageY_raw. This attribute is
+		specific to toggle enabled channels and refers to the DAC output
+		code in the INPUT_B register while regular out_voltageY_raw
+		refers to INPUT_A. The same scale, offset, etc applies.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_symbol
+KernelVersion:	5.16
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Performs a SW toggle. This attribute is specific to toggle
+		enabled channels and allows to toggle between out_voltageY_raw
+		and out_voltageY_raw1 through software. Writing 0 will select
+		out_voltageY_raw while 1 selects out_voltageY_raw1.
diff --git a/MAINTAINERS b/MAINTAINERS
index 90960e3d778f..61b1eaad4611 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -11167,6 +11167,7 @@ M:	Nuno Sá <nuno.sa@analog.com>
 L:	linux-iio@vger.kernel.org
 S:	Supported
 W:	http://ez.analog.com/community/linux-device-drivers
+F:	Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2688
 F:	drivers/iio/dac/ltc2688.c
 
 LTC2947 HARDWARE MONITOR DRIVER
-- 
2.17.1