Hello, On Fri, Oct 04, 2024 at 03:06:55PM +0800, Kent Gibson wrote: > On Wed, Oct 02, 2024 at 02:41:06PM -0400, Jean-Michaël Celerier wrote: > > This is probably best asked on the PWM list, so cross-posting. > > > I am curious of trying the new pwm-gpio driver in Linux 6.11 with a > > Diolan DLN-2 chip, which exposes a gpiochip accessible to linux over > > USB. > > > > I haven't managed to see where the configuration options of the driver > > are set: for instance, let's say I want to create a PWM output channel > > over gpiochip1 line 4, 6 and 12, what should my modprobe line look > > like ? > > Good question. > I think it has to be setup by device tree, but that is just a guess. Setting up the pwm-gpio device via device tree only works if you manage to describe the USB gpio chip in the device tree, too, as teh pwm-gpio device must have valid gpio descriptors. Otherwise you'd need to extend the pwm-gpio driver to instantiate devices dynamically somehow. Best regards Uwe
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