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.

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

Signed-off-by: Chen-Shi-Hong <eric039eric@gmail.com>
---
 Documentation/hwmon/lm75.rst | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/Documentation/hwmon/lm75.rst b/Documentation/hwmon/lm75.rst
index 4269da04508e..cbf737948c1d 100644
--- a/Documentation/hwmon/lm75.rst
+++ b/Documentation/hwmon/lm75.rst
@@ -181,3 +181,21 @@ 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 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