Hi Dhruva,
Am 05.02.24 um 06:55 schrieb Dhruva Gole:
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.
i used the PWM sysfs for testing and this PWM driver doesn't change
anything on this well known interface.
Sorry, i don't understand what needs to be documented additionally?
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.
