Commit Graph

10 Commits

Author SHA1 Message Date
Linus Torvalds 3eb05225ee pwm: Changes for v3.9-rc1
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.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v2.0.19 (GNU/Linux)
 
 iQIcBAABAgAGBQJRKxfbAAoJEN0jrNd/PrOhcwEP/0plVf30QDMhcan1GR3l+jmK
 3Q/cCNIWEZ75mRu+FtVYKUOduxkCOHR6LM4C2ScGnnpsS/X5oitc45FrblIwQaEI
 UeWVxDqI+pEp+rCdYVCND4lih60FJU0Cct0zZL2db4D4idF+8FRChhzwzSXhajnj
 ZZqz782Y2ig3YTLHtVGT1pp61DKxdu1Gz4U+fxo4G1/fnkquCYDzbCQovcmPSnnF
 gYB8hfxgT9JIt2cHrK6eKCHBF/4GToU+x5zDV2Ub15C2K/UQ+qgw82yl8MNd/ZS5
 rFA06iW3icnJRRc8u6hu9WVjNVNTBrUqUlFhctNB01d5jF4R6uR6aEvovT9xe8NW
 Wa5v5WrjnL6SWpZVwb/3kwwJmkeU9zKESQt5KUw3VKnT8yr2BfxcH1gJIiuW6wK7
 uYqknAvt2rwMEGzaKZJmQH682wNMxpJirs8hG9VjJc/v7AOnk6586HbRupAq8wWZ
 qK4n1Fto9RCg+b6e/hDId7+mN1GEcA5B8BOotPQ6ud+cinDZBKSbCSHhQG2LQ++F
 m81BbL82H2R2ICRoYNA74/bKq5OVOFFqHLHg5bUrG7ikdNbYOTK/4dF9qSS7DnT3
 Bi6WnKpOtfpWbHBnDunP2vBFo3f+gXmbLJdgarxk7mneV8wp0GY6TYI1awWn0hI9
 82JP3yiK5kW2JZv92o0H
 =Fcxi
 -----END PGP SIGNATURE-----

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

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
2013-02-26 09:34:29 -08:00
Thierry Reding 6d4294d163 pwm: Convert to devm_ioremap_resource()
Convert all uses of devm_request_and_ioremap() to the newly introduced
devm_ioremap_resource() which provides more consistent error handling.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-01-22 11:41:57 -08:00
Tony Prisk 3ccb1c1702 pwm: vt8500: Add polarity support
Add support to set polarity on PWM devices, allowing for inverted
duty cycles.

Also update the binding document to #pwm-cells = <3> to allow
passing the flags from devicetree.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-09 08:17:12 +01:00
Tony Prisk 8ab432caa4 pwm: vt8500: Register write busy test performed incorrectly
Correct operation for register writes is to perform a busy-wait
after writing the register. Currently the busy wait it performed
before, meaning subsequent register writes to bitfields may occur
before the previous field has been updated.

Also, all registers are defined as 32-bit read/write. Change
pwm_busy_wait() to use readl rather than readb.

Improve readability of code with defines for registers and bitfields.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2013-01-09 08:17:04 +01:00
Tony Prisk 422470a826 pwm: vt8500: Ensure PWM clock is enabled during pwm_config
This patch corrects a bug reported by Peter Vasil.

When all PWMs are disabled, PWM module may be disabled during
calls to pwm_config. This patch enables/disables the clock in
pwm_config to ensure the module is active before register read/
writes.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Tested-by: Peter Vasil <petervasil@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-11-22 22:47:12 +01:00
Tony Prisk 2f9569f7ce pwm: vt8500: Fix build error
A missing '{' causes a build error in pwm-vt8500.c

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-11-22 22:47:11 +01:00
Tony Prisk 63e1ed2364 pwm: vt8500: Update vt8500 PWM driver support
This patch updates pwm-vt8500.c to support devicetree probing and
make use of the common clock subsystem.

A binding document describing the PWM controller found on
arch-vt8500 is also included.

Signed-off-by: Tony Prisk <linux@prisktech.co.nz>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-11-01 16:23:19 +01:00
Sachin Kamat eba7cbe5d8 pwm: vt8500: Fix coding style issue
Fixes the following:
WARNING: Prefer pr_warn(... to pr_warning(...
	pr_warning("Waiting for status bits 0x%x to clear timed out\n",

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-08-17 14:08:25 +02:00
Axel Lin 261995dd30 pwm: Convert pwm-vt8500 to use devm_* APIs
Signed-off-by: Axel Lin <axel.lin@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-07-23 13:23:58 +02:00
Sascha Hauer a245ccebb4 ARM vt8500: Move vt8500 pwm driver to pwm framework
Move the driver to drivers/pwm/ and convert it to use the framework.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Alexey Charkov <alchark@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
2012-07-02 22:06:33 +02:00