[PATCH linux v6 0/2] Support for ASPEED AST2400/AST2500 PWM and Fan Tach driver

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From	Jaghathiswari Rankappagounder Natarajan <jaghu@google.com>
Newsgroups	linux.kernel
Subject	[PATCH linux v6 0/2] Support for ASPEED AST2400/AST2500 PWM and Fan Tach driver
Date	Tue, 04 Apr 2017 01:40:01 +0200
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Support for ASPEED AST2400/AST2500 PWM and Fan Tach driver.
Patches based on the upstream tag 4.9. Changes made in Version 4 are indicated
in the individual patches.
The AST2400/AST2500 PWM controller can support 8 PWM output ports.
The AST2400/AST2500 Fan Tach controller can support 16 tachometer inputs.
The hwmon driver provides sysfs entries through which the user can configure the
duty cycle for the particular PWM output port and read the fan rpm value for
the particular tachometer input.
Added devicetree binding documentation for AST2400/AST2500 PWM and Fan Tach
support.

Tested on Zaius board (which has AST2500 chip) and observed that when
duty cycle is lowered then the fan speed is lowered and lower fan rpm value(
corresponding to the duty cycle) is reported and when the duty cycle is
increased then the fan speed increases and higher fan rpm value(corresponding
to the duty cycle) is reported.

Jaghathiswari Rankappagounder Natarajan (2):
  Documentation: dt-bindings: Document bindings for ASPEED
    AST2400/AST2500 PWM and Fan tach controller device driver
  drivers: hwmon: Support for ASPEED PWM/Fan tach

 .../devicetree/bindings/hwmon/aspeed-pwm-tacho.txt |  68 ++
 Documentation/hwmon/aspeed-pwm-tacho               |  22 +
 drivers/hwmon/Kconfig                              |   9 +
 drivers/hwmon/Makefile                             |   1 +
 drivers/hwmon/aspeed-pwm-tacho.c                   | 846 +++++++++++++++++++++
 5 files changed, 946 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hwmon/aspeed-pwm-tacho.txt
 create mode 100644 Documentation/hwmon/aspeed-pwm-tacho
 create mode 100644 drivers/hwmon/aspeed-pwm-tacho.c

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[PATCH linux v6 0/2] Support for ASPEED AST2400/AST2500 PWM and Fan Tach driver Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> - 2017-04-04 01:40 +0200
  [PATCH linux v6 1/2] Documentation: dt-bindings: Document bindings for ASPEED AST2400/AST2500 PWM and Fan tach controller device driver Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> - 2017-04-04 01:40 +0200
    Re: [PATCH linux v6 1/2] Documentation: dt-bindings: Document  bindings for ASPEED AST2400/AST2500 PWM and Fan tach controller device driver Guenter Roeck <linux@roeck-us.net> - 2017-04-04 15:00 +0200
  [PATCH linux v6 2/2] drivers: hwmon: Support for ASPEED PWM/Fan tach Jaghathiswari Rankappagounder Natarajan <jaghu@google.com> - 2017-04-04 01:40 +0200
    Re: [PATCH linux v6 2/2] drivers: hwmon: Support for ASPEED PWM/Fan  tach Guenter Roeck <linux@roeck-us.net> - 2017-04-04 15:00 +0200

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