[PATCH 2/3] Documentation/hwmon: add Delta E50SN12051 documentation

Colin Huang via B4 Relay
2026-04-29T09:42:06Z

Document the hardware monitoring support for the Delta E50SN12051
device.

The documentation describes the supported sensors exposed via the
hwmon subsystem, including voltage, current, and temperature measurements.

Signed-off-by: Colin Huang <u8813345@gmail.com>
---
Documentation/hwmon/e50sn12051.rst | 81 ++++++++++++++++++++++++++++++++++++++
Documentation/hwmon/index.rst | 1 +
2 files changed, 82 insertions(+)

diff --git a/Documentation/hwmon/e50sn12051.rst b/Documentation/hwmon/e50sn12051.rst
new file mode 100644
index 000000000000..cbbfa7895d82
--- /dev/null
+++ b/Documentation/hwmon/e50sn12051.rst
@@ -0,0 +1,81 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later
+
+Kernel driver e50sn12051
+========================
+
+Supported chips:
+
+ * Delta E50SN12051
+
+ Prefix: 'e50sn12051'
+
+ Addresses scanned: -
+
+ Datasheet:
+
+ Provided by Delta upon request and NDA
+
+Description
+-----------
+
+E50SN12051 is a 600W non-isolated 1/8th brick DC-DC power module.
+
+This driver supports the E50SN12051 PMBus compliant monitor device.
+
+The device provides measurements for:
+
+* Input voltage
+* Output current
+* Output voltage
+* Temperature
+
+The driver is based on the PMBus core and exposes standard hwmon
+sysfs attributes.
+
+Sysfs attributes
+----------------
+
+======================= =======================================================
+curr1_label "iout1"
+curr1_crit Critical maximum current.
+ From IOUT_OC_FAULT_LIMIT register.
+curr1_crit_alarm Current critical high alarm.
+ From IOUT_OC_FAULT status.
+curr1_input Measured current.
+ From READ_IOUT register.
+curr1_max Maximum current.
+ From IOUT_OC_WARN_LIMIT register.
+curr1_max_alarm Current high alarm.
+ From IOUT_OC_WARN_LIMIT status.
+
+in1_label "vin"
+in1_alarm Input voltage alarm.
+in1_input Measured voltage.
+ From READ_VIN register.
+
+in2_label "vout1"
+in2_crit Critical maximum voltage.
+ From VOUT_OV_FAULT_LIMIT register.
+in2_crit_alarm Voltage critical high alarm.
+ From VOLTAGE_OV_FAULT status.
+in2_input Measured voltage.
+ From READ_VOUT register.
+in2_max Maximum voltage.
+ From VOUT_OV_WARN_LIMIT register.
+in2_max_alarm Voltage high alarm.
+ From VOLTAGE_OV_WARNING status.
+
+temp1_crit Critical high temperature.
+ From OT_FAULT_LIMIT register.
+temp1_crit_alarm Module temperature critical high alarm.
+ Set by comparing READ_TEMPERATURE_1 with OT_FAULT_LIMIT
+ if TEMP_OT_FAULT status is set.
+temp1_input Measured module's hot spot temperature.
+ From READ_TEMPERATURE_1 register.
+temp1_max Maximum temperature.
+ From OT_WARN_LIMIT register.
+temp1_max_alarm Module temperature high alarm.
+ Set by comparing READ_TEMPERATURE_1 with OT_WARN_LIMIT if
+ TEMP_OT_WARNING status is set.
+======================= =======================================================
+
diff --git a/Documentation/hwmon/index.rst b/Documentation/hwmon/index.rst
index 8b655e5d6b68..ba08655fc496 100644
--- a/Documentation/hwmon/index.rst
+++ b/Documentation/hwmon/index.rst
@@ -68,6 +68,7 @@ Hardware Monitoring Kernel Drivers
drivetemp
ds1621
ds620
+ e50sn12051
emc1403
emc2103
emc2305

--
2.34.1