[PATCH 2/4] iio: ABI: add ABI file for the LTC2664 DAC

[Kim Seer Paller]

Define the sysfs interface for toggle capable channels.

Toggle enabled channels will have:

 * out_voltageY_toggle_en
 * out_voltageY_raw0
 * out_voltageY_raw1
 * out_voltageY_symbol

The common interface present in all channels is:

 * out_voltageY_raw (not present in toggle enabled channels)
 * out_voltageY_raw_available
 * out_voltageY_powerdown
 * out_voltageY_scale
 * out_voltageY_offset

Co-developed-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
Signed-off-by: Kim Seer Paller <kimseer.paller@xxxxxxxxxx>
---
 .../ABI/testing/sysfs-bus-iio-dac-ltc2664     | 30 +++++++++++++++++++
 MAINTAINERS                                   |  1 +
 2 files changed, 31 insertions(+)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2664

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2664 b/Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2664
new file mode 100644
index 000000000..4b656b7af
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2664
@@ -0,0 +1,30 @@
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_toggle_en
+KernelVersion:	5.18
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Toggle enable. Write 1 to enable toggle or 0 to disable it. This is
+		useful when one wants to change the DAC output codes. The way it should
+		be done is:
+
+		- disable toggle operation;
+		- change out_voltageY_raw0 and out_voltageY_raw1;
+		- enable toggle operation.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_raw0
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_raw1
+KernelVersion:	5.18
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+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 INPUT_A (_raw0) and INPUT_B (_raw1). The same scale and offset
+		as in out_voltageY_raw applies.
+
+What:		/sys/bus/iio/devices/iio:deviceX/out_voltageY_symbol
+KernelVersion:	5.18
+Contact:	linux-iio@xxxxxxxxxxxxxxx
+Description:
+		Performs a SW toggle. This attribute is specific to toggle
+		enabled channels and allows to toggle between out_voltageY_raw0
+		and out_voltageY_raw1 through software. Writing 0 will select
+		out_voltageY_raw0 while 1 selects out_voltageY_raw1.
diff --git a/MAINTAINERS b/MAINTAINERS
index bd8645f6e..9ed00b364 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -12842,6 +12842,7 @@ M:	Kim Seer Paller <kimseer.paller@xxxxxxxxxx>
 L:	linux-iio@xxxxxxxxxxxxxxx
 S:	Supported
 W:	https://ez.analog.com/linux-software-drivers
+F:	Documentation/ABI/testing/sysfs-bus-iio-dac-ltc2664
 F:	Documentation/devicetree/bindings/iio/dac/adi,ltc2664.yaml
 
 LTC2688 IIO DAC DRIVER
-- 
2.34.1