linux-kernel - Re: [PATCHv4 08/12] usb: dwc2: gadget: Do not fail probe if there isn't a clock node

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Date:	Fri, 19 Sep 2014 09:29:38 -0500
From:	Dinh Nguyen <dinguyen@...nsource.altera.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
CC:	<paulz@...opsys.com>, <gregkh@...uxfoundation.org>, <balbi@...com>,
	<dinh.linux@...il.com>, <swarren@...dotorg.org>,
	<matthijs@...in.nl>, <r.baldyga@...sung.com>,
	<jg1.han@...sung.com>, <sachin.kamat@...aro.org>,
	<ben-linux@...ff.org>, <dianders@...omium.org>,
	<kever.yang@...k-chips.com>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv4 08/12] usb: dwc2: gadget: Do not fail probe if there
 isn't a clock node



On 9/12/14, 11:28 AM, Bartlomiej Zolnierkiewicz wrote:
> 
> [ added linux-kernel ML to cc: ]
> 
> Hi,
> 
> On Tuesday, August 26, 2014 11:19:59 AM dinguyen@...nsource.altera.com wrote:
>> From: Dinh Nguyen <dinguyen@...nsource.altera.com>
>>
>> Since the dwc2 hcd driver is currently not looking for a clock node during
>> init, we should not completely fail if there isn't a clock provided.
>> Add a check for a valid clock before calling clock functions.
> 
> This doesn't look correct at least for the case when we are really missing
> the clock and USB_DWC2_PERIPHERAL=y (moreover it just looks wrong to access
> gadget functionalities when clock is disabled). It seems that it would be
> better to just disable gadget functionality on dwc2_gadget_init() failure
> in hcd and not call gadget functions later from hcd if gadget functionality
> is disabled.
> 

Yes...this is correct. Will fix up in v5.

Thanks,
Dinh
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