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| author | Vincent Whitchurch <vincent.whitchurch@axis.com> | 2024-06-04 23:00:41 +0200 |
|---|---|---|
| committer | Uwe Kleine-König <ukleinek@kernel.org> | 2024-07-10 17:52:47 +0200 |
| commit | 7f61257cd6e1ad4769b4b819668cab00f68f2556 (patch) | |
| tree | ca7a481f89118ad80ab7a38d86f4c851c60a6779 /lib/kfifo.c | |
| parent | 1577ddaa515e3af2614e1f52711c287bebc338cf (diff) | |
pwm: Add GPIO PWM driver
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>
Diffstat (limited to 'lib/kfifo.c')
0 files changed, 0 insertions, 0 deletions