1 files changed, 68 insertions, 0 deletions
diff --git a/Documentation/hwmon/sht21.rst b/Documentation/hwmon/sht21.rst
new file mode 100644
index 000000000000..f1f5da030108
--- /dev/null
+++ b/Documentation/hwmon/sht21.rst
@@ -0,0 +1,68 @@
+Kernel driver sht21
+===================
+
+Supported chips:
+
+  * Sensirion SHT21
+
+    Prefix: 'sht21'
+
+    Addresses scanned: none
+
+    Datasheet: Publicly available at the Sensirion website
+
+    http://www.sensirion.com/file/datasheet_sht21
+
+
+
+  * Sensirion SHT25
+
+    Prefix: 'sht25'
+
+    Addresses scanned: none
+
+    Datasheet: Publicly available at the Sensirion website
+
+    http://www.sensirion.com/file/datasheet_sht25
+
+
+
+Author:
+
+  Urs Fleisch <urs.fleisch@sensirion.com>
+
+Description
+-----------
+
+The SHT21 and SHT25 are humidity and temperature sensors in a DFN package of
+only 3 x 3 mm footprint and 1.1 mm height. The difference between the two
+devices is the higher level of precision of the SHT25 (1.8% relative humidity,
+0.2 degree Celsius) compared with the SHT21 (2.0% relative humidity,
+0.3 degree Celsius).
+
+The devices communicate with the I2C protocol. All sensors are set to the same
+I2C address 0x40, so an entry with I2C_BOARD_INFO("sht21", 0x40) can be used
+in the board setup code.
+
+sysfs-Interface
+---------------
+
+temp1_input
+	- temperature input
+
+humidity1_input
+	- humidity input
+eic
+	- Electronic Identification Code
+
+Notes
+-----
+
+The driver uses the default resolution settings of 12 bit for humidity and 14
+bit for temperature, which results in typical measurement times of 22 ms for
+humidity and 66 ms for temperature. To keep self heating below 0.1 degree
+Celsius, the device should not be active for more than 10% of the time,
+e.g. maximum two measurements per second at the given resolution.
+
+Different resolutions, the on-chip heater, and using the CRC checksum
+are not supported yet.