Re: Meson PWM driver

[Vincent DEFERT <vincent.defert%posteo.net@localhost>]

Thank you, I was wondering if I could use the 2 PWM channels available 
on the ODROID C2's GPIO connector to control servos.
Apparently, it's not that simple, but it's not an issue, I'll use a PCA9685.


On 07/07/2025 20:14, Robert Swindells wrote:
> Vincent DEFERT <vincent.defert%posteo.net@localhost> wrote:
> > I have adapted the meson_pwm.c driver to work on the ODROID C2 and now,
> > I want to write a test program to use it.
> > The driver correctly initialises, I can see it in dmesg, but there's no
> > corresponding device under /dev.
> >
> > How am I supposed to talk to it?
> The SoC specific pwm drivers are expected to be used by higher level
> drivers in the kernel, there isn't an interface to userland.
>
> The meson_pwm.c driver registers itself to the framework defined in
> sys/dev/fdt/fdt_pwm.c.
>
> There are calls to find a pwm driver in pwm_backlight.c, pwm_fan.c and
> pwmregulator.c in sys/dev/fdt.
>
> What did you want to use the pwm driver for?