linux-kernel - Re: [PATCH 2/2] arm: omap: remove *.auto* from device names given in usb_bind

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Date:	Tue, 30 Jul 2013 11:55:04 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<balbi@...com>
CC:	<tony@...mide.com>, <linux@....linux.org.uk>,
	<eballetbo@...il.com>, <javier@...hile0.org>,
	<gregkh@...uxfoundation.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>
Subject: Re: [PATCH 2/2] arm: omap: remove *.auto* from device names given
 in usb_bind_phy

Hi,

On Tuesday 30 July 2013 11:48 AM, Felipe Balbi wrote:
> Hi,
> 
> On Tue, Jul 30, 2013 at 11:41:23AM +0530, Kishon Vijay Abraham I wrote:
>>>>>>>> diff --git a/arch/arm/mach-omap2/board-2430sdp.c b/arch/arm/mach-omap2/board-2430sdp.c
>>>>>>>> index 244d8a5..17bb076 100644
>>>>>>>> --- a/arch/arm/mach-omap2/board-2430sdp.c
>>>>>>>> +++ b/arch/arm/mach-omap2/board-2430sdp.c
>>>>>>>> @@ -233,7 +233,7 @@ static void __init omap_2430sdp_init(void)
>>>>>>>>  	omap_hsmmc_init(mmc);
>>>>>>>>  
>>>>>>>>  	omap_mux_init_signal("usb0hs_stp", OMAP_PULL_ENA | OMAP_PULL_UP);
>>>>>>>> -	usb_bind_phy("musb-hdrc.0.auto", 0, "twl4030_usb");
>>>>>>>> +	usb_bind_phy("musb-hdrc.0", 0, "twl4030_usb");
>>>>>>>
>>>>>>> how about moving usb_bind_phy() calls to omap2430.c ?
>>>>>>>
>>>>>>> diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
>>>>>>> index f44e8b5..b6abc1a 100644
>>>>>>> --- a/drivers/usb/musb/omap2430.c
>>>>>>> +++ b/drivers/usb/musb/omap2430.c
>>>>>>> @@ -544,6 +544,9 @@ static int omap2430_probe(struct platform_device *pdev)
>>>>>>>  
>>>>>>>  		pdata->board_data	= data;
>>>>>>>  		pdata->config		= config;
>>>>>>> +	} else {
>>>>>>> +		/* bind the PHY */
>>>>>>> +		usb_bind_phy(dev_name(&musb->dev), 0, "twl4030_usb");
>>>>>>
>>>>>> This looks like a hack IMHO to workaround the usb phy library. otherwise it is
>>>>>> similar to get_phy_by_name.
>>>>>
>>>>> actually, this is a workaround to the fact that we're not creating all
>>>>> platform_devices in arch/arm/mach-omap2/ :-)
>>>>>
>>>>> If we had the musb allocation there, we could easily handle
>>>>> usb_bind_phy()
>>>>>
>>>>>>> so that's temporary. It might be better than to reintroduce the IDR in
>>>>>>> musb_core.c.
>>>>>>
>>>>>> that’s needed for generic phy framework anyway :-s
>>>>>
>>>>> right, but generic phy framework can handle everything just fine, the
>>>>> only problem is that names are changing.
>>>>
>>>> right. But if the names change, PHY framework wouldn't be able to return the
>>>> reference to the PHY.
>>>
>>> with my suggestion they can change whenever they want since we're using
>>> dev_name() of the just-created musb platform_device. Right ?
>>
>> right. But the PHY device can be created in a different place from where the
>> musb devices are created. And in the PHY framework, the PHY device should have
> 
> this shouldn't be a problem. As long as the phy is created, all should
> be good.
> 
>> the list of controller device (names) it can support (PHY framework does not
>> maintain a separate list for binding like how we had in USB PHY library). e.g.
>> http://www.mail-archive.com/linux-omap@vger.kernel.org/msg92817.html. In such
> 
> this has nothing to do with $subject though. We talk about generic PHY
> framework once all these PHY drivers are moved there :-)
> 
>> cases how do we pass the device names. Also will the MUSB core device be
>> created before twl4030-usb PHY device?
> 
> and why would that be a problem ? We're telling the framework that the
> musb device will use a phy with a name of 'twl4030'. If musb calls
> usb_get_phy_dev() and doesn't find a phy, it'll return -EPROBE_DEFER and
> try again later.

I think we are talking about different problems here ;-) I'm trying to tell
using idr in MUSB core is needed for Generic PHY Framework. So in a way, the
Generic PHY Framework series depends on this patch series or else MUSB in OMAP3
platforms wont work after Generic PHY framework gets merged.

Thanks
Kishon
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