linux-kernel - Re: [PATCH 1/8] usb: phy: nop: Add some parameters to platform data

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Date:	Wed, 13 Mar 2013 17:46:55 +0200
From:	Roger Quadros <rogerq@...com>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
CC:	Marc Kleine-Budde <mkl@...gutronix.de>, <balbi@...com>,
	<tony@...mide.com>, <mark.rutland@....com>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
	<linux-omap@...r.kernel.org>, <devicetree-discuss@...ts.ozlabs.org>
Subject: Re: [PATCH 1/8] usb: phy: nop: Add some parameters to platform data

On 03/13/2013 05:17 PM, Peter Ujfalusi wrote:
> On 03/12/2013 04:20 PM, Roger Quadros wrote:
>> Adding Peter to the loop. I faintly remember him mentioning this issue before
>> for beagle. We really need the deferred probe mechanism or we need to resort
>> to device registering order.
> 
> Yes, BeagleBoard is a good example. Long story short: we have external
> dependency and the correct way to handle that is via deferred probe.
> 
> As of now we are not ready to kill the legacy support but over time we should
> move as much as we can to DT only mode.
> 
>> The first user for needs_vcc flag will be the beagleboard file. I just didn't
>> implement it in this patch [1].
>>
>> On second thoughts, since [1] does work on beagleboard without requiring the
>> needs_vcc flag, I think we can just live without it.
> 
> The BeagleBoard works because the bootloader happen to enable the PWM
> generator which is used as a GPIO for the external HUB enable port. As soon as
> the bootloader stops doing this we are going to be in trouble.
> 

Wasn't it the LED A out GPO from PMIC that is used to enable the HUB? Just cross
checking so I haven't missed anything.

I will resend the board support patch for beagle implementing
needs_vcc flag for the deferred probe mechanism. Thanks.

cheers,
-roger
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