linux.git/drivers/pwm/core.c, branch v3.9.8

Merge tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwm

2013-02-26T17:34:29+00:00

Pull PWM changes from Thierry Reding:
 "A new driver has been added to support the PWM mode of the timer
  counter blocks found on Atmel AT91 SoCs.  The VT8500 driver now
  supports changing the PWM signal polarity and the TI drivers (EHRPWM
  and ECAP) gained suspend and resume functionality.

  User drivers can now query the core for whether access to a PWM device
  will sleep (if the PWM chip is on a slow bus such as I2C or SPI).

  The pwm-backlight driver now handles the backlight BL_CORE_FBBLANK
  state in addition to the FB layer's blanking states.

  To round things off, a few fixes and cleanups are also included"

* tag 'for-3.9-rc1' of git://gitorious.org/linux-pwm/linux-pwm:
  pwm: twl: Use to_twl() instead of container_of()
  pwm: tegra: assume CONFIG_OF
  pwm_backlight: Validate dft_brightness in main probe function
  pwm: Export pwm_{set,get}_chip_data()
  pwm: Make Kconfig entries more consistent
  pwm: Add can_sleep property to drivers
  pwm: Add pwm_can_sleep() as exported API to users
  pwm-backlight: handle BL_CORE_FBBLANK state
  pwm: pwm-tiecap: Low power sleep support
  pwm: pwm-tiehrpwm: Low power sleep support
  pwm: pwm-tiehrpwm: Update the clock handling of pwm-tiehrpwm driver
  pwm: vt8500: Add polarity support
  pwm: vt8500: Register write busy test performed incorrectly
  pwm: atmel: add Timer Counter Block PWM driver

pwm: Add devm_of_pwm_get() as exported API for users

2013-02-02T01:47:05+00:00

When booted with DT users can use devm version of of_pwm_get() to benefit
from automatic resource release.

Signed-off-by: Peter Ujfalusi 
Acked-by: Thierry Reding 
Signed-off-by: Bryan Wu

pwm: core: Rename of_pwm_request() to of_pwm_get() and export it

2013-02-02T01:47:05+00:00

Allow client driver to use of_pwm_get() to get the PWM they need. This
is needed for drivers which handle more than one PWM separately, like
leds-pwm driver, which have:

pwmleds {
	compatible = "pwm-leds";
	kpad {
		label = "omap4::keypad";
		pwms = <&twl_pwm 0 7812500>;
		max-brightness = <127>;
	};

	charging {
		label = "omap4:green:chrg";
		pwms = <&twl_pwmled 0 7812500>;
		max-brightness = <255>;
	};
};

in the dts files.

Signed-off-by: Peter Ujfalusi 
Acked-by: Thierry Reding 
Signed-off-by: Bryan Wu

pwm: Export pwm_{set,get}_chip_data()

2013-01-30T08:22:24+00:00

When building a driver as a module, these functions need to be exported
for linking to succeed.

Signed-off-by: Thierry Reding

pwm: Add pwm_can_sleep() as exported API to users

2013-01-30T08:12:18+00:00

Calls to some external PWM chips can sleep. To help users,
add pwm_can_sleep() API.

Cc: Thierry Reding 
Cc: Peter Ujfalusi 
Signed-off-by: Florian Vaussard 
Reviewed-by: Peter Ujfalusi 
Signed-off-by: Thierry Reding

pwm: Export of_pwm_xlate_with_flags()

2012-12-06T07:51:38+00:00

Drivers may want to use this function if they support any of the flags
that can be passed via a third cell in the DT specifier. Since those
drivers may be built as modules the symbol needs to be exported to make
sure that it can be accessed.

Signed-off-by: Thierry Reding

pwm: Device tree support for PWM polarity

2012-11-22T21:47:12+00:00

Add support for encoding PWM properties in bit encoded form with
of_pwm_xlate_with_flags() function support. Platforms require platform
specific PWM properties has to populate in 3rd cell of the pwm-specifier
and PWM driver should also set .of_xlate support with this function.
Currently PWM property polarity encoded in bit position 0 of the third
cell in pwm-specifier.

Signed-off-by: Philip, Avinash 
Acked-by: Grant Likely 
Signed-off-by: Thierry Reding

pwm: Check for negative duty-cycle and period

2012-10-05T18:56:43+00:00

Make sure the duty-cycle and period passed in are not negative. This
should eventually be made implicit by making them unsigned. While at
it, the drivers' .config() implementations can have the equivalent
checks removed.

Signed-off-by: Thierry Reding 
Cc: Shawn Guo 
Cc: Mark Brown 
Cc: Arnd Bergmann 
Cc: Sachin Kamat 
Cc: Axel Lin 
Cc: Kukjin Kim 
Cc: Jingoo Han 
Cc: Jonghwan Choi 
Cc: Sascha Hauer 
Cc: "Philip, Avinash" 
Cc: Vaibhav Bedia 
Acked-by: Jingoo Han

pwm: add devm_pwm_get() and devm_pwm_put()

2012-09-10T15:05:45+00:00

Add resource managed variants of pwm_get() and pwm_put() for
convenience. Code is largely inspired by the equivalent devm functions
of the regulator framework.

Signed-off-by: Alexandre Courbot 
Signed-off-by: Thierry Reding

pwm: Add support for configuring the PWM polarity

2012-09-10T15:05:44+00:00

Some hardware supports inverting the polarity of the PWM signal. This
commit adds support to the PWM framework to allow users of the PWM API
to configure the polarity. Note that in order to reduce complexity,
changing the polarity of a PWM signal is only allowed while the PWM is
disabled.

A practical example where this can prove useful is to simulate inversion
of the duty cycle. While inversion of polarity and duty cycle are not
exactly the same, the differences for most use-cases are negligible.

Signed-off-by: Philip, Avinash 
Signed-off-by: Thierry Reding