linux-kernel - Re: [PATCH v3 2/5] dt-bindings: Add a binding for Mediatek xHCI host controller

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Date:	Fri, 31 Jul 2015 14:37:07 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	chunfeng yun <chunfeng.yun@...iatek.com>
Cc:	Mathias Nyman <mathias.nyman@...el.com>,
	Rob Herring <robh+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	Felipe Balbi <balbi@...com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Roger Quadros <rogerq@...com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>,
	John Crispin <blogic@...nwrt.org>,
	Daniel Kurtz <djkurtz@...omium.org>
Subject: Re: [PATCH v3 2/5] dt-bindings: Add a binding for Mediatek xHCI host
 controller

Hi,

> > > + - mediatek,usb-wakeup: to access usb wakeup control register
> > 
> > What exactly does this property imply?
> > 
> There are some control registers for usb wakeup which are put in another
> module, here to get the node of that module, and then use regmap and
> syscon to operate it.

Ok. You need to specify the type of this property (i.e. that it is a
phandle to a syscon node). The description makes it sound like a boolean.

> 
> > > + - mediatek,wakeup-src: 1: ip sleep wakeup mode; 2: line state wakeup
> > > +	mode; others means don't enable wakeup source of usb
> > 
> > This sounds like configuration rather than a hardware property. Why do
> > you think this needs to be in the DT?
> > 
> Yes, it's better to put it in the DT. 

That doesn't answer my question.

_why_ do you think this needs to be in the DT? What do you think is
better for it being there?

> 
> > > + - mediatek,u2port-num: the number should not greater than the number
> > > +	of phys
> > 
> > What exactly does this property imply?
> > 
> On some platform, it only makes use of partial usb ports, so disable
> others to save power.

What exactly do you mean by "partial USB ports"?

If a phy isn't wired up, it won't be listed in the phys property, if it
is then disabling it sounds like a run-time decision.

Thanks,
Mark.
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