[PATCH v7 4/4] hwmon: (sht3x) Document support for GXCAS GXHT30

[Zaixiang Xu <zaixiang.xu.dev@gmail.com>]

The GXCAS GXHT30 is a humidity and temperature sensor that is a
drop-in replacement for and fully software compatible with the
Sensirion SHT30.

It is handled by the "sensirion,sht30" fallback compatible without
any driver changes; manual instantiation works with the existing
sht3x device name. Document the chip as supported.

Signed-off-by: Zaixiang Xu <zaixiang.xu.dev@gmail.com>
---
 Documentation/hwmon/sht3x.rst | 17 ++++++++++++++---
 drivers/hwmon/Kconfig         |  5 +++--
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/Documentation/hwmon/sht3x.rst b/Documentation/hwmon/sht3x.rst
index ea1642920295..4f67671eb0cd 100644
--- a/Documentation/hwmon/sht3x.rst
+++ b/Documentation/hwmon/sht3x.rst
@@ -31,6 +31,14 @@ Supported chips:
 
     Datasheet: https://sensirion.com/media/documents/4B40CEF3/640B2346/Sensirion_Humidity_Sensors_SHT85_Datasheet.pdf
 
+  * GXCAS GXHT30
+
+    Prefix: 'sht3x'
+
+    Addresses scanned: none
+
+    Datasheet: https://www.galaxy-cas.com/uploads/files/202509/GXHT30_datasheet_V3.9_20250919170350.pdf
+
 Author:
 
   - David Frey <david.frey@sensirion.com>
@@ -40,9 +48,12 @@ Description
 -----------
 
 This driver implements support for the Sensirion SHT3x-DIS, STS3x-DIS and SHT85
-series of humidity and temperature sensors. Temperature is measured in degrees
-celsius, relative humidity is expressed as a percentage. In the sysfs interface,
-all values are scaled by 1000, i.e. the value for 31.5 degrees celsius is 31500.
+series of humidity and temperature sensors, as well as the compatible GXCAS
+GXHT30. The GXHT30 is a drop-in replacement for the SHT30: instantiate it from
+devicetree with the "gxcas,gxht30", "sensirion,sht30" compatibles, or manually
+using the sht3x device name. Temperature is measured in degrees celsius,
+relative humidity is expressed as a percentage. In the sysfs interface, all
+values are scaled by 1000, i.e. the value for 31.5 degrees celsius is 31500.
 
 The device communicates with the I2C protocol. SHT3x sensors can have the I2C
 addresses 0x44 or 0x45 (0x4a or 0x4b for sts3x), depending on the wiring. SHT85
diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 08c29685126a..64fc00ade5ca 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -2023,8 +2023,9 @@ config SENSORS_SHT3x
 	depends on I2C
 	select CRC8
 	help
-	  If you say yes here you get support for the Sensiron SHT30, SHT31 and
-	  SHT85 humidity and temperature sensors.
+	  If you say yes here you get support for the Sensiron SHT30, SHT31,
+	  SHT85 and the compatible GXCAS GXHT30 humidity and temperature
+	  sensors.
 
 	  This driver can also be built as a module. If so, the module
 	  will be called sht3x.
-- 
2.34.1