Messages in this thread | | | Date | Tue, 12 Apr 2016 08:13:27 -0700 | From | Tony Lindgren <> | Subject | Re: [PATCH] of/platform: Allow secondary compatible match in of_dev_lookup |
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* Felipe Balbi <felipe.balbi@linux.intel.com> [160407 04:19]: > Grygorii Strashko <grygorii.strashko@ti.com> writes: > > Most probably this is required to pass some data from parent device to > > children when parent dev instantiate children from DT, at least I've experimented with > > this in mostly similar way (I've not added second pass and did break in the first > > if !phys_addr, but Tony's patch is more correct).
OK that's a different use case I have, but good to know it helps with that too.
> > For example, > > - USB dwc3 platform/integration layer dev creates DWC3-core device (of_platform_populate()) > > - DWC3-core device creates xhci device > > - USB dwc3 platform/integration layer dev can dynamically get rev info > > from HW and identify limitation/erratas/quirks which need to be applied to > > to its children. > > - DWC3-core can dynamically get rev info ... > > > > I was not able to find any other proper way to pass this (platfrom)data to children, except > > using Auxdata. And, as per Felipe Balbi, It was the major reason why now > > DWC3-core device creates xhci device manually. > > doesn't device_property() solve that ? I'm just waiting for some patches > from Heikki (in Cc) before we rip pdata from dwc3 completely. At that > point, we can look at building xhci from DT. > > The only thing that comes to mind is how this will look for PCI-only > systems if we rip manual xHCI device creation completely.
Sounds like this dwc3 thread is a bit separate from the $subject patch except for the legacy usage.
Regards,
Tony
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