linux-kernel - RE: [PATCH v2 2/7] ARM: tegra: update device trees for USB binding rework

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Date:	Thu, 4 Apr 2013 18:31:39 +0530
From:	Venu Byravarasu <vbyravarasu@...dia.com>
To:	Stephen Warren <swarren@...dotorg.org>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"balbi@...com" <balbi@...com>,
	"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 2/7] ARM: tegra: update device trees for USB binding
 rework

> -----Original Message-----
> From: Stephen Warren [mailto:swarren@...dotorg.org]
> Sent: Thursday, April 04, 2013 12:47 AM
> To: Venu Byravarasu
> Cc: gregkh@...uxfoundation.org; balbi@...com;
> stern@...land.harvard.edu; linux-tegra@...r.kernel.org; linux-
> usb@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH v2 2/7] ARM: tegra: update device trees for USB binding
> rework
> 
> On 04/03/2013 02:41 AM, Venu Byravarasu wrote:
> > This patch updates all Tegra board files so that they contain all the
> 
> The binding documentation says that the vbus-supply property is required
> in all cases. However, many of the DT files still don't have that
> property even after this patch. That's inconsistent.

Will edit the binding to have the vbus-supply only for otg cases. 

> 
> > diff --git a/arch/arm/boot/dts/tegra20-iris-512.dts
> b/arch/arm/boot/dts/tegra20-iris-512.dts
> > index 52f1103..c99eccc 100644
> > --- a/arch/arm/boot/dts/tegra20-iris-512.dts
> > +++ b/arch/arm/boot/dts/tegra20-iris-512.dts
> > @@ -41,6 +41,10 @@
> >  		dr_mode = "otg";
> >  	};
> >
> > +	usb-phy@...00000 {
> > +		dr_mode = "otg";
> > +	};
> 
> Since this port claims to be OTG-capable, presumably a vbus-supply
> property is mandatory here? If you don't know enough about the board to
> correctly set up such a regulator, lets just mark this port as host-only
> for now; we can switch it back to OTG-mode later once someone implements
> the required regulator. This won't lose any functionality, since we
> don't support OTG-mode yet anyway. However, it will allow the device
> tree to be correct/consistent in the mean time.
 
Agree completely.
Will update the patch accordingly and send for review.

> 
> > diff --git a/arch/arm/boot/dts/tegra20-seaboard.dts
> b/arch/arm/boot/dts/tegra20-seaboard.dts
> 
> > +	usb-phy@...00000 {
> > +		vbus-supply = <&vbus_reg>;
> > +		dr_mode = "otg";
> > +	};
> 
> Where is the nvidia,vbus-gpio property? Since your code changes don't
> actually implement use of the vbus-supply property yet, they will expect
> the vbus-gpio property to exist in the PHY node.

As of now Vbus-gpio is being used by EHCI driver only.
As anyways we wanted to use vbus-supply, will implement its
support in PHY driver and remove vbus-gpio from EHCI node. 
Hence did not add vbus-gpio to PHY DT nodes.

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