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 09:18:30 +0300
From:	Felipe Balbi <balbi@...com>
To:	Kishon Vijay Abraham I <kishon@...com>
CC:	<balbi@...com>, <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 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.

-- 
balbi

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