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authorBoris Brezillon <boris.brezillon@free-electrons.com>2016-04-14 21:17:41 +0200
committerThierry Reding <thierry.reding@gmail.com>2016-05-17 14:48:03 +0200
commit5ec803edcb703fe379836f13560b79dfac79b01d (patch)
treeee69e2156e03337bd928e151a5c5a39aa44baeb2 /Documentation/pwm.txt
parent15fa8a43c147213a9563903c87b29671035eb6e8 (diff)
downloadlinux-5ec803edcb703fe379836f13560b79dfac79b01d.tar.bz2
pwm: Add core infrastructure to allow atomic updates
Add an ->apply() method to the pwm_ops struct to allow PWM drivers to implement atomic updates. This method is preferred over the ->enable(), ->disable() and ->config() methods if available. Add the pwm_apply_state() function to the PWM user API. Note that the pwm_apply_state() does not guarantee the atomicity of the update operation, it all depends on the availability and implementation of the ->apply() method. pwm_enable/disable/set_polarity/config() are now implemented as wrappers around the pwm_apply_state() function. pwm_adjust_config() is allowing smooth handover between the bootloader and the kernel. This function tries to adapt the current PWM state to the PWM arguments coming from a PWM lookup table or a DT definition without changing the duty_cycle/period proportion. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> [thierry.reding@gmail.com: fix a couple of typos] Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
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