Messages in this thread | | | From | Sascha Hauer <> | Subject | [RFC] add pwmlib support | Date | Fri, 28 Jan 2011 13:21:21 +0100 |
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Hi all,
While implementing just another pwm driver I thought it's time to implement generic pwm support. The following series adds drivers/pwm/pwmlib.c and a i.MX23/28 pwm driver which serves as a usage example for pwmlib. The code is inspired by gpiolib support and tested using the backlight pwm driver by Eric Miao.
Currently the pwm_request, pwm_add, pwm_remove and pwm_free operations are protected with a single mutex wherea the pwm_enable, pwm_disable and pwm_config operations are unlocked. It is assumed that the owners of the pwm handle the serialization of the pwm accesses. This may not be enough, so i'd like to discuss the locking (and type of locking) here.
I Cced the people working with PWMs in the kernel in the hope that they can give input on what's missing / wrong in this implementation
Sascha
The following changes since commit 2b1caf6ed7b888c95a1909d343799672731651a5:
Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip (2011-01-20 18:30:37 -0800)
are available in the git repository at:
git://git.pengutronix.de/git/imx/linux-2.6.git pwmlib
Sascha Hauer (2): pwmlib: add pwm support pwm: Add a i.MX23/28 pwm driver
drivers/Kconfig | 2 + drivers/Makefile | 1 + drivers/pwm/Kconfig | 16 +++ drivers/pwm/Makefile | 3 + drivers/pwm/mxs-pwm.c | 275 +++++++++++++++++++++++++++++++++++++++++++++++++ drivers/pwm/pwmlib.c | 246 +++++++++++++++++++++++++++++++++++++++++++ include/linux/pwm.h | 38 +++++++ 7 files changed, 581 insertions(+), 0 deletions(-) create mode 100644 drivers/pwm/Kconfig create mode 100644 drivers/pwm/Makefile create mode 100644 drivers/pwm/mxs-pwm.c create mode 100644 drivers/pwm/pwmlib.c
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