linux-kernel - Re: [PATCH] ARM: dts: omap3-beagle: Fix USB host on beagle boards (for 3.13)

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Date:	Tue, 03 Dec 2013 12:10:17 +0100
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Roger Quadros <rogerq@...com>
Cc:	tony@...mide.com, bcousson@...libre.com, balbi@...com, nm@...com,
	linux-omap@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: omap3-beagle: Fix USB host on beagle boards (for 3.13)

Hi Roger,

On Tuesday 03 December 2013 11:36:57 Roger Quadros wrote:
> On 12/03/2013 05:54 AM, Laurent Pinchart wrote:
> > Hi Roger,
> > 
> > On Monday 25 November 2013 15:55:45 Roger Quadros wrote:
> >> Beagle (rev. C4) and Beagle-XM (all revs) need VAUX2 1.8V supply
> >> for the USB PHY.
> >> 
> >> As the generic PHY driver can't handle more than one supply
> >> at the moment, we configure this supply to be always on.
> >> This will cause a very small power impact if the USB host subsystem
> >> is not in use, about 76.86 micro-W + LDO power.
> >> 
> >> Older Beagle boards (prior to C4) don't have VAUX2 connected anywhere,
> >> so there won't be any functional impact on those boards other than
> >> some additional LDO power consumption.
> > 
> > Do I need any patch other than this one (on top of v3.13-rc1) to enable
> > the ethernet port on a Beagleboard-xM rev B ? Here's what the kernel
> > reports at boot (with ignore_loglevel set on the command line).
> 
> It seems on Rev A/B, the power enable line for the USB hub has reversed
> polarity than Rev C.
> 
> Does the below patch work for you?

It does, thank you.

> If yes, how do we account for it? Do we add a new file
> "omap3-beagle-xm-ab.dts" for rev A/B boards?

Unless we want to add board code back with a runtime check, which I doubt 
would be regarded as a good idea, I don't see any other easy solution.

> diff --git a/arch/arm/boot/dts/omap3-beagle-xm.dts
> b/arch/arm/boot/dts/omap3-beagle-xm.dts index b39918e..434d903 100644
> --- a/arch/arm/boot/dts/omap3-beagle-xm.dts
> +++ b/arch/arm/boot/dts/omap3-beagle-xm.dts
> @@ -78,6 +78,7 @@
>  		regulator-max-microvolt = <3300000>;
>  		gpio = <&twl_gpio 18 0>;	/* GPIO LEDA */
>  		startup-delay-us = <70000>;
> +		enable-active-high;
>  	};
> 
>  	/* HS USB Host PHY on PORT 2 */

-- 
Regards,

Laurent Pinchart

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