Re: [PATCH v10 2/9] dt-bindings: pinctrl: Deprecate Tegra XUSB pad controller binding

Thierry Reding
2016-04-18T11:36:00Z

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On Tue, Mar 15, 2016 at 10:01:25AM +0100, Linus Walleij wrote:
> On Fri, Mar 4, 2016 at 5:19 PM, Thierry Reding <thierry.reding-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
> >
> > This is an old version of the binding that isn't flexible enough to
> > describe all aspects of the XUSB pad controller. Specifically with the
> > addition of XUSB support (for SuperSpeed USB) the existing binding is
> > no longer suitable.
> >
> > Signed-off-by: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
>
> That's unfortunate, not to say unelegant. I want to know Stephen's
> opinion on these patches (probably they are in another mail)
> before merging.
>
> Will the new binding also work with SuperDuperSpeed USB and
> SuperSuperMegaUltraOrtonSpeed USB I wonder... or will we
> change the bindings again?

To answer this question: yes, I think that it will be flexible enough to
support future generations of this IP, provided that the design doesn't
change in a fundamental way.

The change from the pinctrl-based bindings to this new one is that each
lane provided by the XUSB pad controller is exposed as a separate PHY
object and hence allows fine-grained control over when which lane is
powered up. It also allows each lane to be easily configured because it
has its own device tree node.

Thierry

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