Clemens Gruber 01ec847200 pwm-pca9685: Support changing the output frequency ... Previously, period_ns and duty_ns were only used to determine the ratio of ON and OFF time, the default frequency of 200 Hz was never changed. The PCA9685 however is capable of changing the PWM output frequency, which is expected when changing the period. This patch configures the prescaler accordingly, using the formula and notes provided in the PCA9685 datasheet. Bounds checking for the minimum and maximum frequencies, last updated in revision v.4 of said datasheet, is also added. The prescaler is only touched if the period changed, because we have to put the chip into sleep mode to unlock the prescale register. If it is changed, the PWM output frequency changes for all outputs, because there is one prescaler per chip. This is documented in the PCA9685 datasheet and in the comments. If the duty cycle is not changed at the same time as the period, then we restart the PWM output using the duty cycle to period ratio from before the period change. When using LEDs for example, previously set brightness levels stay the same when the frequency changes. Cc: Thierry Reding <thierry.reding@gmail.com> Cc: Steffen Trumtrar <s.trumtrar@pengutronix.de> Signed-off-by: Clemens Gruber <clemens.gruber@pqgruber.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>		2015-08-17 16:35:46 +02:00
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accessibility	…
acpi	Additional ACPICA material for v4.2-rc1	2015-07-02 17:11:28 -07:00
amba	…
android	…
ata	ARM: SoC cleanups for v4.2	2015-06-26 11:08:27 -07:00
atm	…
auxdisplay	…
base	Merge branch 'akpm' (patches from Andrew)	2015-07-01 17:47:51 -07:00
bcma	…
block	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2015-07-04 19:36:06 -07:00
bluetooth	Bluetooth: ath3k: Add support of 04ca:300d AR3012 device	2015-06-18 21:00:06 +03:00
bus	ARM: SoC: driver updates for v4.2	2015-06-26 11:54:29 -07:00
cdrom	…
char	Merge tag 'drm-intel-next-fixes-2015-07-02' of git://anongit.freedesktop.org/drm-intel	2015-07-02 14:36:40 -07:00
clk	Replace module_platform_driver with builtin_platform driver in non modules.	2015-07-02 10:42:13 -07:00
clocksource	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-07-01 15:44:18 -07:00
connector	…
cpufreq	Replace module_platform_driver with builtin_platform driver in non modules.	2015-07-02 10:42:13 -07:00
cpuidle	Replace module_platform_driver with builtin_platform driver in non modules.	2015-07-02 10:42:13 -07:00
crypto	crypto: marvell/cesa - another fix up for of_get_named_gen_pool() rename	2015-07-03 11:37:02 -07:00
dca	…
devfreq	…
dio	…
dma	Merge branch 'akpm' (patches from Andrew)	2015-07-01 17:47:51 -07:00
dma-buf	…
edac	A build fix for octeon_edac from Aaro Koskinen.	2015-07-03 12:10:12 -07:00
eisa	…
extcon	…
firewire	…
firmware	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2015-07-03 15:20:57 -07:00
fmc	…
gpio	Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-07-01 15:19:35 -07:00
gpu	Merge tag 'topic/drm-fixes-2015-07-04' of git://anongit.freedesktop.org/drm-intel	2015-07-03 16:09:29 -07:00
hid	Merge branches 'for-4.2/i2c-hid', 'for-4.2/lenovo', 'for-4.2/plantronics', 'for-4.2/rmi', 'for-4.2/sensor-hub', 'for-4.2/sjoy', 'for-4.2/sony' and 'for-4.2/wacom' into for-linus	2015-06-22 16:23:43 +02:00
hsi	Fix up implicit <module.h> users that will break later.	2015-07-02 10:25:22 -07:00
hv	…
hwmon	hwmon: (w83627ehf) Use swap() in w82627ehf_swap_tempreg()	2015-07-03 14:39:06 +02:00
hwspinlock	hwspinlock: qcom: Correct msb in regmap_field	2015-07-01 16:15:05 +03:00
hwtracing/coresight	…
i2c	Char/Misc driver patches for 4.2-rc1	2015-06-26 14:51:15 -07:00
ide	Minor merge needed, due to function move.	2015-07-01 10:49:25 -07:00
idle	…
iio	…
infiniband	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2015-07-04 19:36:06 -07:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2015-07-04 08:14:22 -07:00
iommu	IOMMU Fixes for Linux v4.2-rc0	2015-07-01 14:44:22 -07:00
ipack	…
irqchip	Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-07-04 09:22:51 -07:00
isdn	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2015-06-24 16:49:49 -07:00
leds	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds	2015-07-01 19:09:11 -07:00
lguest	Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-06-22 17:59:09 -07:00
macintosh	macintosh/nvram: Remove as unused	2015-06-15 16:42:37 +10:00
mailbox	Replace module_init with appropriate alternate initcall in non modules.	2015-07-02 10:36:29 -07:00
mcb	…
md	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2015-07-04 19:36:06 -07:00
media	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds	2015-07-01 19:09:11 -07:00
memory	ARM: SoC: driver updates for v4.2	2015-06-26 11:54:29 -07:00
memstick	memstick: remove deprecated use of pci api	2015-06-30 19:44:57 -07:00
message	…
mfd	Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-07-01 15:19:35 -07:00
misc	Minor merge needed, due to function move.	2015-07-01 10:49:25 -07:00
mmc	ARM: SoC: late fixes and dependencies	2015-07-02 14:40:49 -07:00
mtd	Minor merge needed, due to function move.	2015-07-01 10:49:25 -07:00
net	A very significant modification to NTB in this series.	2015-07-04 14:07:47 -07:00
nfc	Char/Misc driver patches for 4.2-rc1	2015-06-26 14:51:15 -07:00
ntb	NTB: Add split BAR output for debugfs stats	2015-07-04 14:09:32 -04:00
nubus	…
nvdimm	arch, x86: pmem api for ensuring durability of persistent memory updates	2015-06-26 11:23:38 -04:00
of	Devicetree changes for v4.2	2015-07-01 19:40:18 -07:00
oprofile	…
parisc	…
parport	…
pci	Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-07-01 15:19:35 -07:00
pcmcia	Fix up implicit <module.h> users that will break later.	2015-07-02 10:25:22 -07:00
phy	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2015-06-27 12:44:34 -07:00
pinctrl	Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-07-01 15:19:35 -07:00
platform	platform-drivers-x86 for 4.2-2	2015-07-05 10:54:09 -07:00
pnp	Merge branches 'pnp' and 'pm-tools'	2015-06-19 01:18:43 +02:00
power	Replace module_platform_driver with builtin_platform driver in non modules.	2015-07-02 10:42:13 -07:00
powercap	…
pps	…
ps3	…
ptp	…
pwm	pwm-pca9685: Support changing the output frequency	2015-08-17 16:35:46 +02:00
rapidio	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2015-06-23 14:08:54 -07:00
ras	…
regulator	Fix up implicit <module.h> users that will break later.	2015-07-02 10:25:22 -07:00
remoteproc	remoteproc: fix !CONFIG_OF build breakage	2015-06-18 11:44:41 +03:00
reset	…
rpmsg	…
rtc	Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus	2015-06-27 12:44:34 -07:00
s390	KVM: s390: virtio-ccw: don't overwrite config space values	2015-07-03 18:55:18 +02:00
sbus	…
scsi	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2015-07-04 14:13:43 -07:00
sfi	…
sh	Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-07-01 15:19:35 -07:00
sn	…
soc	ARM: SoC: late fixes and dependencies	2015-07-02 14:40:49 -07:00
spi	Merge remote-tracking branches 'spi/topic/sirf', 'spi/topic/spidev' and 'spi/topic/zynq' into spi-next	2015-06-18 00:19:56 +01:00
spmi	…
ssb	…
staging	Staging driver patches for 4.2-rc1	2015-06-26 15:46:08 -07:00
target	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2015-07-04 14:13:43 -07:00
tc	…
thermal	Minor merge needed, due to function move.	2015-07-01 10:49:25 -07:00
thunderbolt	…
tty	ARM: SoC: late fixes and dependencies	2015-07-02 14:40:49 -07:00
uio	…
usb	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2015-07-04 19:36:06 -07:00
uwb	…
vfio	VFIO updates for v4.2	2015-06-28 12:32:13 -07:00
vhost	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2015-07-04 14:13:43 -07:00
video	fbdev fixes for 4.2	2015-07-03 12:11:17 -07:00
virt	…
virtio	virtio/vhost: cross endian support	2015-07-03 16:02:25 -07:00
vlynq	…
vme	…
w1	…
watchdog	Merge git://www.linux-watchdog.org/linux-watchdog	2015-07-01 19:33:16 -07:00
xen	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending	2015-07-04 14:13:43 -07:00
zorro	…
Kconfig	libnvdimm, nfit: initial libnvdimm infrastructure and NFIT support	2015-06-24 21:24:10 -04:00
Makefile	The libnvdimm sub-system introduces, in addition to the libnvdimm-core,	2015-06-29 10:34:42 -07:00