hwmon: Update the sysfs interface documentation

* Document the name attribute.
* Document the *_label attributes.
* Drop "typical usage" lists, they no longer match the reality.
* Drop non hardware-monitoring related entries.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Acked-by: Hans de Goede <j.w.r.degoede@hhs.nl>
Signed-off-by: Mark M. Hoffman <mhoffman@lightlink.com>

Documentation/hwmon/sysfs-interface

@@ -78,8 +78,21 @@ RW	read/write value
 Read/write values may be read-only for some chips, depending on the
 hardware implementation.
 
-All entries are optional, and should only be created in a given driver
-if the chip has the feature.
+All entries (except name) are optional, and should only be created in a
+given driver if the chip has the feature.
+
+
+********
+* Name *
+********
+
+name		The chip name.
+		This should be a short, lowercase string, not containing
+		spaces nor dashes, representing the chip name. This is
+		the only mandatory attribute.
+		I2C devices get this attribute created automatically.
+		RO
+
 
 ************
 * Voltages *
@@ -104,18 +117,17 @@ in[0-*]_input	Voltage input value.
 		by the chip driver, and must be done by the application.
 		However, some drivers (notably lm87 and via686a)
 		do scale, because of internal resistors built into a chip.
-		These drivers will output the actual voltage.
-
-		Typical usage:
-			in0_*	CPU #1 voltage (not scaled)
-			in1_*	CPU #2 voltage (not scaled)
-			in2_*	3.3V nominal (not scaled)
-			in3_*	5.0V nominal (scaled)
-			in4_*	12.0V nominal (scaled)
-			in5_*	-12.0V nominal (scaled)
-			in6_*	-5.0V nominal (scaled)
-			in7_*	varies
-			in8_*	varies
+		These drivers will output the actual voltage. Rule of
+		thumb: drivers should report the voltage values at the
+		"pins" of the chip.
+
+in[0-*]_label	Suggested voltage channel label.
+		Text string
+		Should only be created if the driver has hints about what
+		this voltage channel is being used for, and user-space
+		doesn't. In all other cases, the label is provided by
+		user-space.
+		RO
 
 cpu[0-*]_vid	CPU core reference voltage.
 		Unit: millivolt
@@ -159,6 +171,13 @@ fan[1-*]_target
 		Only makes sense if the chip supports closed-loop fan speed
 		control based on the measured fan speed.
 
+fan[1-*]_label	Suggested fan channel label.
+		Text string
+		Should only be created if the driver has hints about what
+		this fan channel is being used for, and user-space doesn't.
+		In all other cases, the label is provided by user-space.
+		RO
+
 Also see the Alarms section for status flags associated with fans.
 
 
@@ -260,18 +279,19 @@ temp[1-*]_crit_hyst
 		from the critical value.
 		RW
 
-temp[1-4]_offset
+temp[1-*]_offset
 		Temperature offset which is added to the temperature reading
 		by the chip.
 		Unit: millidegree Celsius
 		Read/Write value.
 
-		If there are multiple temperature sensors, temp1_* is
-		generally the sensor inside the chip itself,
-		reported as "motherboard temperature".  temp2_* to
-		temp4_* are generally sensors external to the chip
-		itself, for example the thermal diode inside the CPU or
-		a thermistor nearby.
+temp[1-*]_label	Suggested temperature channel label.
+		Text string
+		Should only be created if the driver has hints about what
+		this temperature channel is being used for, and user-space
+		doesn't. In all other cases, the label is provided by
+		user-space.
+		RO
 
 Some chips measure temperature using external thermistors and an ADC, and
 report the temperature measurement as a voltage. Converting this voltage
@@ -391,16 +411,3 @@ beep_mask	Bitmask for beep.
 		use discouraged for the same reason. Use individual
 		*_beep files instead.
 		RW
-
-
-*********
-* Other *
-*********
-
-eeprom		Raw EEPROM data in binary form.
-		RO
-
-pec		Enable or disable PEC (SMBus only)
-		0: disable
-		1: enable
-		RW