[PATCH 4/4] docs: iio: ade9000: document ADE9039 support

[Antoniu Miclaus <antoniu.miclaus@analog.com>]

Add the ADE9039 to the list of supported devices and note that, unlike the
ADE9078 and ADE9430, it does provide the on-chip dip/swell events. Also
document that it exposes no total reactive power attributes, since the part
computes only fundamental reactive power.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
---
 Documentation/iio/ade9000.rst | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/Documentation/iio/ade9000.rst b/Documentation/iio/ade9000.rst
index 0c0a8ea8213b..13b7ecf83cb8 100644
--- a/Documentation/iio/ade9000.rst
+++ b/Documentation/iio/ade9000.rst
@@ -1,12 +1,11 @@
 .. SPDX-License-Identifier: GPL-2.0
 
-==============================
-ADE9000/ADE9078/ADE9430 driver
-==============================
+======================================
+ADE9000/ADE9078/ADE9430/ADE9039 driver
+======================================
 
-+This driver supports Analog Devices' ADE9000, ADE9078 and ADE9430 energy
-+measurement ICs on SPI bus.
-ICs on SPI bus.
+This driver supports Analog Devices' ADE9000, ADE9078, ADE9430 and ADE9039
+energy measurement ICs on SPI bus.
 
 1. Supported devices
 ====================
@@ -14,6 +13,7 @@ ICs on SPI bus.
 * `ADE9000 <https://www.analog.com/media/en/technical-documentation/data-sheets/ADE9000.pdf>`_
 * `ADE9078 <https://www.analog.com/media/en/technical-documentation/data-sheets/ADE9078.pdf>`_
 * `ADE9430 <https://www.analog.com/media/en/technical-documentation/data-sheets/ADE9430.pdf>`_
+* `ADE9039 <https://www.analog.com/media/en/technical-documentation/data-sheets/ADE9039.pdf>`_
 
 The supported parts are highly accurate, fully integrated,
 multiphase energy and power quality monitoring devices. Superior analog
@@ -24,9 +24,15 @@ for the entire channel including a programmable gain amplifier (PGA) and an
 analog-to-digital converter (ADC).
 
 The ADE9078 and ADE9430 do not provide the on-chip dip/swell (sag) detection
-available on the ADE9000, so the RMS voltage swell/dip events described below are
-only available on the ADE9000. The ADE9430 additionally has no on-chip digital
-integrator and instead uses an external analog integrator for Rogowski coils.
+available on the ADE9000 and the ADE9039, so the RMS voltage swell/dip events
+described below are only available on those two parts. The ADE9430 additionally
+has no on-chip digital integrator and instead uses an external analog integrator
+for Rogowski coils.
+
+The ADE9039 computes only fundamental reactive power and has no total reactive
+power register, so the ``in_power[0-2]_reactive_*`` files described below are
+not present on that part. The reactive energy files are unaffected, as every
+supported part accumulates fundamental reactive energy.
 
 2. Device attributes
 ====================
-- 
2.43.0