Re: [PATCH] arm64: dts: rockchip: add usb3 controller node for RK3328 SoCs

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Has anyone tested this since Jonas Karlman's clk patch landed?
I noticed a lot of my USB hotplug issues disappeared when I pulled
that patch in.
Especially since one of the fixes was aclk_usb3otg, since it was
incorrectly defined to usb2's aclk.

On Thu, Mar 14, 2019 at 3:21 PM Heiko Stübner <heiko@xxxxxxxxx> wrote:
>
> Hi again :-)
>
> Am Donnerstag, 14. März 2019, 20:08:30 CET schrieb Leonidas P. Papadakos:
> > I must say with my testing, I never really have any disconnects. My
> > drive generally works
>
> It's not any disconnects, it is really when you unplug the device from
> the root port that the
>
> > Surely it's better that it works somewhat than not at all.
> > Maybe we could include the patches and revert them later if a solution
> > arrises?
> >
> > Or is that against the Linux way of doing things?
>
> The main issue is
>                compatible = "rockchip,rk3328-dwc3", "rockchip,rk3399-dwc3";
>
> because:
> (1) On the devicetree-side you declare that they are compatible which may
>     or may not conflict with needed later changes
> (2) On the kernel-driver-side with the current status the rk3328-dwc3
>     will get ignored and rk3399-dwc3 used to bind to the generic dt-dwc3
>     driver.
>     From looking at the Rockchip code in the vendor kernel we may very well
>     need a separate driver to handle the big issue which creates the issue
>     which driver will bind to the dt-node. It will be either the generic one
>     binding to the rk3399-dwc3 or the special one binding to rk3328-dwc3.
>     And sadly it will probably depend on which module gets loaded first.
>
> And devicetrees are supposed to be backwards compatible so a newer
> kernel should keep working with an old devicetree.
>
> A possible way forward would be to introduce a separate compatible for
> rk3328 (both in the binding doc and the generic dwc3 driver), so that
> we get only a
>                compatible = "rockchip,rk3328-dwc3";
>
> Which then even can move easily into a new driver if necessary without
> causing issues for existing devicetrees.
>
> Heiko
>
>
>
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