hwmon: (nct7802) Add auto_point attributes

Introduced REG_PWM, pwm[1..3]_auto_point[1..5]_temp, pwm[1..3]_auto_point[1..5]_pwm, nct7802_auto_point_attrs, nct7802_auto_point_group, updated nct7802_regmap_is_volatile

---

Changed in v5:
- removed URL and fixed typo
Changed in v4:
- fixed expression in nct7802_regmap_is_volatile
- added pwmX_auto_point to driver's documentation Changed in v3:
- removed nct7802_auto_point_is_visible
- removed usage of sysfs_update_group
- introduced REG_PWM
- removed S_IWUSR from RO attributes
- added PWM registers to nct7802_regmap_is_volatile Changed in v2:
- removed PWM_REG, TEMP_REG
- removed auto_point[1..4]_temp, auto_point[1..4]_pwm and auto_point_crit_temp
- introduced pwm[1..3]_auto_point[1..5]_temp and pwm[1..3]_auto_point[1..5]_pwm.
- introduced nct7802_auto_point_is_visible
- used sysfs_update_group in store_pwm_enable

---
 Documentation/hwmon/nct7802 |   3 +-
 drivers/hwmon/nct7802.c     | 130 ++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 127 insertions(+), 6 deletions(-)

index 2e00f5e..5438deb 100644
@@ -17,8 +17,7 @@ This driver implements support for the Nuvoton NCT7802Y hardware monitoring
 chip. NCT7802Y supports 6 temperature sensors, 5 voltage sensors, and 3 fan
 speed sensors.
 
-The chip also supports intelligent fan speed control. This functionality is
-not currently supported by the driver.
+Smart Fan™ speed control is available via pwmX_auto_point attributes.
 
 Tested Boards and BIOS Versions
 -------------------------------

1.9.1

Applied to -next.

Note that the patch requires http://www.spinics.net/lists/kernel/msg2041703.html
to work reliably.

Thanks,
Guenter

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