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Add a software PWM which toggles a GPIO from a high-resolution timer. This will naturally not be as accurate or as efficient as a hardware PWM, but it is useful in some cases. I have for example used it for evaluating LED brightness handling (via leds-pwm) on a board where the LED was just hooked up to a GPIO, and for a simple verification of the timer frequency on another platform. Since high-resolution timers are used, sleeping GPIO chips are not supported and are rejected in the probe function. Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com> Co-developed-by: Stefan Wahren <wahrenst@gmx.net> Signed-off-by: Stefan Wahren <wahrenst@gmx.net> Co-developed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Andy Shevchenko <andy@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Dhruva Gole <d-gole@ti.com> Link: https://lore.kernel.org/r/20240604-pwm-gpio-v7-2-6b67cf60db92@linaro.org Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org> |
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.. | ||
ABI | ||
accel | ||
accounting | ||
admin-guide | ||
arch | ||
block | ||
bpf | ||
cdrom | ||
core-api | ||
cpu-freq | ||
crypto | ||
dev-tools | ||
devicetree | ||
doc-guide | ||
driver-api | ||
fault-injection | ||
fb | ||
features | ||
filesystems | ||
firmware_class | ||
firmware-guide | ||
fpga | ||
gpu | ||
hid | ||
hwmon | ||
i2c | ||
iio | ||
images | ||
infiniband | ||
input | ||
isdn | ||
kbuild | ||
kernel-hacking | ||
leds | ||
litmus-tests | ||
livepatch | ||
locking | ||
maintainer | ||
mhi | ||
misc-devices | ||
mm | ||
netlabel | ||
netlink | ||
networking | ||
nvdimm | ||
nvme | ||
PCI | ||
pcmcia | ||
peci | ||
power | ||
process | ||
RCU | ||
rust | ||
scheduler | ||
scsi | ||
security | ||
sound | ||
sphinx | ||
sphinx-static | ||
spi | ||
staging | ||
target | ||
tee | ||
timers | ||
tools | ||
trace | ||
translations | ||
usb | ||
userspace-api | ||
virt | ||
w1 | ||
watchdog | ||
wmi | ||
.gitignore | ||
atomic_bitops.txt | ||
atomic_t.txt | ||
Changes | ||
CodingStyle | ||
conf.py | ||
docutils.conf | ||
dontdiff | ||
index.rst | ||
Kconfig | ||
Makefile | ||
memory-barriers.txt | ||
SubmittingPatches | ||
subsystem-apis.rst |