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

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Message-ID: <20160418113600.GB17716@ulmo.ba.sec>
Date:	Mon, 18 Apr 2016 13:36:00 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Kishon Vijay Abraham I <kishon@...com>,
	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	Andrew Bresticker <abrestic@...omium.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v10 2/9] dt-bindings: pinctrl: Deprecate Tegra XUSB pad
 controller binding

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@...il.com> wrote:
> 
> > From: Thierry Reding <treding@...dia.com>
> >
> > 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@...dia.com>
> 
> 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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