[PATCH v3] Documentation: hwmon: lm75: document sysfs interface

[Chen-Shi-Hong <eric039eric@gmail.com>]

Document the sysfs attributes supported by the lm75 driver.

The driver exposes temp1_input, temp1_max, temp1_max_hyst, and the
standard update_interval attribute. Some chips also expose temp1_alarm,
and temp1_label is available if a label is provided for the device.

Add a sysfs-Interface section to Documentation/hwmon/lm75.rst to
describe the supported attributes and clarify that temp1_alarm,
temp1_label, and the write permissions of update_interval depend on the
chip.

Signed-off-by: Chen-Shi-Hong <eric039eric@gmail.com>
---
Changes in v2:
- Document temp1_label as conditionally available when a device label is
  provided.

Changes in v3:
- Add changelog requested during review.

 Documentation/hwmon/lm75.rst | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/Documentation/hwmon/lm75.rst b/Documentation/hwmon/lm75.rst
index 4269da04508e..fa8ddcaa0c2b 100644
--- a/Documentation/hwmon/lm75.rst
+++ b/Documentation/hwmon/lm75.rst
@@ -181,3 +181,28 @@ is supported by this driver, other specific enhancements are not.
 
 The LM77 is not supported, contrary to what we pretended for a long time.
 Both chips are simply not compatible, value encoding differs.
+
+sysfs-Interface
+---------------
+
+================ ============================================
+temp1_input      temperature input
+temp1_max        maximum temperature
+temp1_max_hyst   maximum temperature hysteresis
+================ ============================================
+
+If a label is provided for the device, the following attribute is also
+available:
+
+================ ============================================
+temp1_label      temperature channel label
+================ ============================================
+
+If supported by the chip, the following attribute is also available:
+
+================ ============================================
+temp1_alarm      temperature alarm
+================ ============================================
+
+The standard update_interval attribute is also supported. Its write
+permissions depend on the chip.
-- 
2.53.0