Sascha Hauer 0c2498f166 pwm: Add PWM framework support ... This patch adds framework support for PWM (pulse width modulation) devices. The is a barebone PWM API already in the kernel under include/linux/pwm.h, but it does not allow for multiple drivers as each of them implements the pwm_*() functions. There are other PWM framework patches around from Bill Gatliff. Unlike his framework this one does not change the existing API for PWMs so that this framework can act as a drop in replacement for the existing API. Why another framework? Several people argue that there should not be another framework for PWMs but they should be integrated into one of the existing frameworks like led or hwmon. Unlike these frameworks the PWM framework is agnostic to the purpose of the PWM. In fact, a PWM can drive a LED, but this makes the LED framework a user of a PWM, like already done in leds-pwm.c. The gpio framework also is not suitable for PWMs. Every gpio could be turned into a PWM using timer based toggling, but on the other hand not every PWM hardware device can be turned into a gpio due to the lack of hardware capabilities. This patch does not try to improve the PWM API yet, this could be done in subsequent patches. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de> Acked-by: Kurt Van Dijck <kurt.van.dijck@eia.be> Reviewed-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Matthias Kaehlcke <matthias@kaehlcke.net> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Reviewed-by: Shawn Guo <shawn.guo@linaro.org> [thierry.reding@avionic-design.de: fixup typos, kerneldoc comments] Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>		2012-06-15 12:56:50 +02:00
..
ABI	- More robust parsing especially of xattr data in JFFS2	2012-06-01 16:55:42 -07:00
accounting
acpi	Update documentation for parameter *notrigger* in einj.txt	2012-03-30 03:30:19 -04:00
aoe	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
arm	fbdev updates for 3.5	2012-06-01 16:57:51 -07:00
auxdisplay
backlight
blackfin	Documentation: Fix typo in multiple files in Documentation	2012-04-16 14:37:13 +02:00
block
blockdev	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
cdrom
cgroups	memcg: move charges to root cgroup if use_hierarchy=0	2012-05-29 16:22:27 -07:00
connector
console
cpu-freq
cpuidle	cpuidle: add a sysfs entry to disable specific C state for debug purpose.	2012-03-30 01:52:58 -04:00
cris	CRIS: Update documentation	2012-04-03 13:09:18 +02:00
crypto
development-process
device-mapper	dm thin: provide userspace access to pool metadata	2012-06-03 00:30:01 +01:00
devicetree	i2c: Add generic I2C multiplexer using pinctrl API	2012-06-04 16:49:43 +02:00
DocBook	- More robust parsing especially of xattr data in JFFS2	2012-06-01 16:55:42 -07:00
driver-model	Pin control subsystem changes for kernel 3.5:	2012-05-21 16:58:23 -07:00
dvb	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-05-24 10:21:51 -07:00
early-userspace
EDID
extcon	Documentation/extcon: porting guide for Android kernel switch driver.	2012-04-20 09:24:27 -07:00
fault-injection
fb	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
filesystems	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-06-01 10:34:35 -07:00
firmware_class
frv
hid
hwmon	hwmon updates for 3.5-rc1	2012-05-23 14:15:09 -07:00
i2c	i2c: Split I2C_M_NOSTART support out of I2C_FUNC_PROTOCOL_MANGLING	2012-05-30 10:55:34 +02:00
i2o
ia64
ide	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
infiniband
input	Documentation: input.txt: clarify mousedev 'cat' command syntax	2012-03-30 16:03:15 -07:00
ioctl	mei: update Documentation/ioctl/ioctl-number.txt	2012-05-09 14:00:31 -07:00
isdn	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
ja_JP
kbuild	Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2012-05-28 10:37:56 -07:00
kdump
ko_KR
laptops	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
leds	leds: add new transient trigger for one shot timer activation	2012-05-29 16:22:32 -07:00
m68k
make
memory-devices	memory: emif: add basic infrastructure for EMIF driver	2012-05-02 00:10:49 -07:00
mips
misc-devices	mei: Documentation: add generated example binary into .gitignore file	2012-05-14 15:43:44 -07:00
mmc
mn10300
mtd
namespaces
netlabel
networking	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-05-22 19:22:50 -07:00
nfc	NFC: Update Documentation/nfc-hci.txt	2012-05-15 17:28:01 -04:00
parisc	Documentation: Fix typo in multiple files in Documentation	2012-04-16 14:37:13 +02:00
PCI
pcmcia
power	A bunch of fixes for v3.5, nothing extraordinary.	2012-05-31 12:10:15 -07:00
powerpc	Revert "powerpc/hw-breakpoint: Use generic hw-breakpoint interfaces for new PPC ptrace flags"	2012-05-22 14:37:24 +10:00
pps
prctl	Documentation: prctl/seccomp_filter	2012-04-14 11:13:22 +10:00
pti
ptp
rapidio
RCU	rcu: Introduce rcutorture testing for rcu_barrier()	2012-04-30 10:48:18 -07:00
s390	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
scheduler	sched: Remove stale power aware scheduling remnants and dysfunctional knobs	2012-05-17 13:48:56 +02:00
scsi	Merge branch 'delete-mca' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2012-05-23 17:12:06 -07:00
security	Smack: allow for significantly longer Smack labels v4	2012-05-14 22:48:38 -07:00
serial	serial: delete the MCA specific 8250 support.	2012-05-17 19:02:14 -04:00
sh
sound	Sound updates for 3.5-rc1	2012-05-23 13:05:43 -07:00
spi
sysctl	mqueue: separate mqueue default value from maximum value	2012-05-31 17:49:31 -07:00
target
telephony
thermal
timers
trace	tracing: Fix kconfig warning due to a typo	2012-05-08 14:17:25 +02:00
usb	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2012-05-22 19:22:50 -07:00
vDSO
video4linux	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media	2012-05-24 10:21:51 -07:00
virtual	Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2012-05-24 16:17:30 -07:00
vm	Frontswap provides a "transcendent memory" interface for swap pages.	2012-06-04 12:28:45 -07:00
w1
watchdog	Watchdog: DA9052/53 PMIC watchdog support	2012-05-30 07:56:12 +02:00
wimax
x86	x86, efi: Add EFI boot stub documentation	2012-06-01 09:11:41 -07:00
zh_CN	Fix a mistake sentence in the file 'Documentation/zh_CN/magic-number.txt'	2012-05-07 17:20:27 -07:00
.gitignore
00-INDEX	MCA: delete all remaining traces of microchannel bus support.	2012-05-17 19:06:13 -04:00
applying-patches.txt
atomic_ops.txt
bad_memory.txt
basic_profiling.txt
binfmt_misc.txt
braille-console.txt
bt8xxgpio.txt
btmrvl.txt
BUG-HUNTING
bus-virt-phys-mapping.txt
cachetlb.txt
Changes
circular-buffers.txt
clk.txt
coccinelle.txt
CodingStyle	CodingStyle: add kmalloc_array() to memory allocators	2012-05-31 17:49:26 -07:00
cpu-hotplug.txt	documentation: remove references to cpu_*_map.	2012-03-29 15:38:31 +10:30
cpu-load.txt
cputopology.txt
crc32.txt
dcdbas.txt
debugging-modules.txt
debugging-via-ohci1394.txt
dell_rbu.txt
devices.txt	Merge branch 'delete-mca' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2012-05-23 17:12:06 -07:00
digsig.txt
DMA-API-HOWTO.txt
DMA-API.txt
DMA-attributes.txt
dma-buf-sharing.txt	dma-buf: add initial vmap documentation	2012-05-25 12:51:11 +05:30
DMA-ISA-LPC.txt
dmaengine.txt
dontdiff	Documentation: remove 'mach' from dontdiff file	2012-03-30 16:03:15 -07:00
dynamic-debug-howto.txt	dynamic_debug: update Documentation/*, Kconfig.debug	2012-04-30 16:26:30 -04:00
edac.txt	Documentation: Fix typo in multiple files in Documentation	2012-04-16 14:37:13 +02:00
eisa.txt	MCA: delete all remaining traces of microchannel bus support.	2012-05-17 19:06:13 -04:00
email-clients.txt
feature-removal-schedule.txt	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-05-31 10:32:36 -07:00
flexible-arrays.txt
futex-requeue-pi.txt
gcov.txt
gpio.txt	gpio: add flags to export GPIOs when requesting	2012-04-05 21:24:06 -07:00
highuid.txt
HOWTO	docs: update HOWTO for 2.6.x -> 3.x versioning	2012-04-19 19:13:08 -07:00
hw_random.txt
hwspinlock.txt
init.txt
initrd.txt	Documentation/initrd.txt: Change the location of util-linux	2012-05-25 16:18:34 +02:00
intel_txt.txt
Intel-IOMMU.txt
io_ordering.txt
io-mapping.txt
iostats.txt
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
isapnp.txt
java.txt
kernel-doc-nano-HOWTO.txt
kernel-docs.txt
kernel-parameters.txt	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-06-04 11:25:31 -07:00
kmemcheck.txt
kmemleak.txt
kobject.txt
kprobes.txt
kref.txt
ldm.txt
local_ops.txt
lockdep-design.txt
lockstat.txt
lockup-watchdogs.txt
logo.gif
logo.txt
magic-number.txt
Makefile	mei: move doc files Documentation/misc-devices/mei	2012-05-09 13:59:09 -07:00
ManagementStyle
md.txt
media-framework.txt	[media] media: Add link_validate() op to check links to the sink pad	2012-05-14 08:44:11 -03:00
memory-barriers.txt
memory-hotplug.txt	Documentation: Fix typo in multiple files in Documentation	2012-04-16 14:37:13 +02:00
memory.txt
mono.txt	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
mutex-design.txt
nommu-mmap.txt
numastat.txt
oops-tracing.txt
padata.txt
parport-lowlevel.txt
parport.txt	Documentation: remove references to /etc/modprobe.conf	2012-03-30 16:03:15 -07:00
pi-futex.txt
pinctrl.txt	pinctrl: implement devm_pinctrl_get()/put()	2012-04-18 13:53:13 +02:00
pnp.txt
preempt-locking.txt
printk-formats.txt
prio_tree.txt
pwm.txt	pwm: Add PWM framework support	2012-06-15 12:56:50 +02:00
ramoops.txt	pstore/ram: Add ECC support	2012-05-17 08:51:59 -07:00
rbtree.txt
remoteproc.txt
rfkill.txt
robust-futex-ABI.txt
robust-futexes.txt
rpmsg.txt
rt-mutex-design.txt
rt-mutex.txt
rtc.txt
SAK.txt
SecurityBugs
serial-console.txt
sgi-ioc4.txt
sgi-visws.txt
SM501.txt
sparse.txt
spinlocks.txt
stable_api_nonsense.txt
stable_kernel_rules.txt
static-keys.txt	Documentation: Fix typo in multiple files in Documentation	2012-04-16 14:37:13 +02:00
SubmitChecklist
SubmittingDrivers
SubmittingPatches	Documentation/SubmittingPatches: suggested the use of scripts/get_maintainer.pl	2012-05-25 16:18:30 +02:00
svga.txt
sysfs-rules.txt
sysrq.txt	Documentation: sysrq: Crutcher Dunnavant is unavailable	2012-03-30 16:03:15 -07:00
unaligned-memory-access.txt
unicode.txt
unshare.txt
VGA-softcursor.txt
vgaarbiter.txt
video-output.txt
vme_api.txt	VME: Move API documentation to Documentation folder	2012-05-08 16:01:34 -07:00
volatile-considered-harmful.txt
workqueue.txt
xz.txt
zorro.txt