Hi, On Feb 04, 2024 at 23:08:49 +0100, Stefan Wahren wrote: > Add a software PWM which toggles a GPIO from a high-resolution timer. > > Recent discussions in the Raspberry Pi community revealt that a lot > of users still use MMIO userspace tools for GPIO access. One argument > for this approach is the lack of a GPIO PWM kernel driver. So this > series tries to fill this gap. > > This continues the work of Vincent Whitchurch [1], which is easier > to read and more consequent by rejecting sleeping GPIOs than Nicola's > approach [2]. > > The work has been tested on a Raspberry Pi 3 B+ and a cheap logic > analyzer. I recently came across this series and I have to say that it will sure be a nice to have feature to be able to use any GPIO as a PWM. However, just a minor suggestion is that we should make sure it's well documented how to actually use this. It would be much appreciated if you could include some basic documentation of a few sysfs commands or any userspace library that you used to test what you've mentioned above. Maybe add another patch for this page? https://docs.kernel.org/driver-api/pwm.html#using-pwms-with-the-sysfs-interface This will ensure people know about this feature and will actually be able to use it. -- Best regards, Dhruva Gole <d-gole@xxxxxx>
