linux-kernel - Re: [PATCH] ARM: dts: omap3-beagle-xm: Add USB Host support for Rev Ax/Bx

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Date:	Tue, 16 Apr 2013 20:30:42 -0500
From:	Robert Nelson <robertcnelson@...il.com>
To:	Tony Lindgren <tony@...mide.com>
Cc:	Roger Quadros <rogerq@...com>, devicetree-discuss@...ts.ozlabs.org,
	linux-omap@...r.kernel.org, b-cousson@...com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: omap3-beagle-xm: Add USB Host support for Rev Ax/Bx

On Tue, Apr 16, 2013 at 7:52 PM, Tony Lindgren <tony@...mide.com> wrote:
> * Roger Quadros <rogerq@...com> [130415 05:44]:
>> On 04/15/2013 03:35 PM, Roger Quadros wrote:
>> > Provide RESET and Power regulators for the USB PHY,
>> > the USB Host port mode and the PHY device.
>> >
>> > Also provide pin multiplexer information for USB host
>> > pins.
>> >
>> > This will not work for Rev Cx boards because of reversed logic
>> > for USB_POWER_Enable.
>> >
>> > CC: Benoît Cousson <b-cousson@...com>
>> > Signed-off-by: Roger Quadros <rogerq@...com>
>> > ---
>> >  arch/arm/boot/dts/omap3-beagle-xm.dts |   62 +++++++++++++++++++++++++++++++++
>> >  1 files changed, 62 insertions(+), 0 deletions(-)
>> >
>> > diff --git a/arch/arm/boot/dts/omap3-beagle-xm.dts b/arch/arm/boot/dts/omap3-beagle-xm.dts
>> > index 5a31964..d394c51 100644
>> > --- a/arch/arm/boot/dts/omap3-beagle-xm.dts
>> > +++ b/arch/arm/boot/dts/omap3-beagle-xm.dts
>> > @@ -57,6 +57,60 @@
>> >             ti,mcbsp = <&mcbsp2>;
>> >             ti,codec = <&twl_audio>;
>> >     };
>> > +
>> > +   /* HS USB Port 2 RESET */
>> > +   hsusb2_reset: hsusb2_reset_reg {
>> > +           compatible = "regulator-fixed";
>> > +           regulator-name = "hsusb2_reset";
>> > +           regulator-min-microvolt = <3300000>;
>> > +           regulator-max-microvolt = <3300000>;
>> > +           gpio = <&gpio5 19 0>;   /* gpio_147 */
>> > +           startup-delay-us = <70000>;
>> > +           enable-active-high;
>> > +   };
>> > +
>> > +   /* HS USB Port 2 Power */
>> > +   hsusb2_power: hsusb2_power_reg {
>> > +           compatible = "regulator-fixed";
>> > +           regulator-name = "hsusb2_vbus";
>> > +           regulator-min-microvolt = <3300000>;
>> > +           regulator-max-microvolt = <3300000>;
>> > +           gpio = <&twl_gpio 18 0>;        /* GPIO LEDA */
>> > +           startup-delay-us = <70000>;
>> > +           enable-active-high;     /* FIXME: active-low for Rev. C */
>>
>> Benoit & Tony,
>>
>> Any ideas how to tackle the reversed logic for Rev. C boards?
>
> Sounds like we need a shared omap3-beage.dtsi, then omap3-beagle-xm.dts
> and omap3-beagle-rev-c.dts. Then xm and rev-c can both include the

Bike-sheding, but we might want to make that "omap3-beagle-xmc.dts" as
there is the "rev c" variant of the original beagle...

It's too bad we can't read the 3 gpio pin states in the device tree
and make a decision.

Regards,

-- 
Robert Nelson
http://www.rcn-ee.com/
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