linux-kernel - RE: [PATCHv5 2/7] usb: dwc2: Move gadget probe function into platform code

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Message-ID: <A2CA0424C0A6F04399FB9E1CD98E0304844E4FDC@US01WEMBX2.internal.synopsys.com>
Date:	Wed, 22 Oct 2014 20:54:00 +0000
From:	Paul Zimmerman <Paul.Zimmerman@...opsys.com>
To:	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	"dinguyen@...nsource.altera.com" <dinguyen@...nsource.altera.com>
CC:	"balbi@...com" <balbi@...com>,
	"dinh.linux@...il.com" <dinh.linux@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"matthijs@...in.nl" <matthijs@...in.nl>,
	"r.baldyga@...sung.com" <r.baldyga@...sung.com>,
	"jg1.han@...sung.com" <jg1.han@...sung.com>,
	"sachin.kamat@...aro.org" <sachin.kamat@...aro.org>,
	"ben-linux@...ff.org" <ben-linux@...ff.org>,
	"dianders@...omium.org" <dianders@...omium.org>,
	"kever.yang@...k-chips.com" <kever.yang@...k-chips.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCHv5 2/7] usb: dwc2: Move gadget probe function into
 platform code

> From: Bartlomiej Zolnierkiewicz [mailto:b.zolnierkie@...sung.com]
> Sent: Wednesday, October 22, 2014 4:16 AM
> 
> On Monday, October 20, 2014 01:52:01 PM dinguyen@...nsource.altera.com wrote:
> > From: Dinh Nguyen <dinguyen@...nsource.altera.com>
> >
> > This patch will aggregate the probing of gadget/hcd driver into platform.c.
> > The gadget probe funtion is converted into gadget_init that is now only
> > responsible for gadget only initialization. All the gadget resources is now
> > handled by platform.c
> >
> > Since the host workqueue will not get initialized if the driver is configured
> > for peripheral mode only. Thus we need to check for wq_otg before calling
> > queue_work().
> >
> > Also, we move spin_lock_init to common location for both host and gadget that
> > is either in platform.c or pci.c.
> >
> > We also ove suspend/resume code to common platform code, and update it to use
> > the new PM API (struct dev_pm_ops).
> >
> > Lastly, move the "samsung,s3c6400-hsotg" binding into dwc2_of_match_table.
> 
> This patch seems to break bisectability.  It moves all the gadget probing
> to platform.c but Kconfig/Makefile are not updated (platform.c will be
> compiled only for CONFIG_USB_DWC2_PLATFORM=y which in turn depends on
> CONFIG_USB_DWC2_HOST).  IMO patch #7 should be merged into this one (#2).

It doesn't break the compile, I already tested it. It does break the
operation of the driver until patch #7 is applied, but I think that's
OK in the middle of a patch series. I think it's a bit much to expect
the driver to keep working at each step of a patch series like this.

-- 
Paul

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