On Thu, Mar 20, 2025 at 06:40:56PM -0700, Greg KH wrote: > On Thu, Mar 20, 2025 at 11:27:43PM +0100, Danilo Krummrich wrote: > > Device::parent() returns a reference to the device' parent device, if > > any. > > Ok, but why? You don't use it in this series, or did I miss it? Indeed, it should rather be at the auxbus series. > A driver shouldn't care about the parent of a device, as it shouldn't > really know what it is. So what is this needed for? Generally, that's true. I use in the auxbus example and in nova-drm [1] (which is connected through the auxbus to nova-core) to gather some information about the device managed by nova-core. Later on, since that's surely not enough, we'll have an interface to nova-core that takes the corresponding auxiliary device. nova-core can then check whether the given device originates from nova-core, and through the parent find its own device. [1] https://gitlab.freedesktop.org/drm/nova/-/blob/staging/nova-drm/drivers/gpu/drm/nova/driver.rs
