linux-kernel - RE: [PATCH v9 13/14] usb: gadget: udc: adapt to OTG core

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Date:	Thu, 9 Jun 2016 10:49:13 +0000
From:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:	Roger Quadros <rogerq@...com>,
	"peter.chen@...escale.com" <peter.chen@...escale.com>
CC:	"balbi@...nel.org" <balbi@...nel.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"mathias.nyman@...ux.intel.com" <mathias.nyman@...ux.intel.com>,
	"Joao.Pinto@...opsys.com" <Joao.Pinto@...opsys.com>,
	"sergei.shtylyov@...entembedded.com" 
	<sergei.shtylyov@...entembedded.com>,
	"jun.li@...escale.com" <jun.li@...escale.com>,
	"grygorii.strashko@...com" <grygorii.strashko@...com>,
	"robh@...nel.org" <robh@...nel.org>,
	"nsekhar@...com" <nsekhar@...com>, "b-liu@...com" <b-liu@...com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: RE: [PATCH v9 13/14] usb: gadget: udc: adapt to OTG core

Hi Roger,

> From: Roger Quadros
> Sent: Wednesday, June 08, 2016 6:04 PM
> 
> The OTG state machine needs a mechanism to start and
> stop the gadget controller as well as connect/disconnect
> from the bus. Add usb_gadget_start(), usb_gadget_stop()
> and usb_gadget_connect_control().
> 
> Introduce usb_otg_add_gadget_udc() to allow controller drivers
> to register a gadget controller that is part of an OTG instance.
> 
> Register with OTG core when UDC is added in usb_add_gadget_udc_release()
> and unregister on usb_del_gadget_udc().
> 
> Notify the OTG core when gadget function driver is available on
> udc_bind_to_driver() and when it is removed in usb_gadget_remove_driver().
> 
> We need to unlock the usb_lock mutex before calling
> usb_otg_register_gadget() else it will cause a circular
> locking dependency.
> 
> Ignore softconnect sysfs control when we're in OTG
> mode as OTG FSM should care of gadget softconnect using
> the b_bus_req mechanism.
> 
> Signed-off-by: Roger Quadros <rogerq@...com>
> ---
>  drivers/usb/gadget/udc/udc-core.c | 202 ++++++++++++++++++++++++++++++++++++--
>  include/linux/usb/gadget.h        |   4 +
>  2 files changed, 196 insertions(+), 10 deletions(-)

I tried to apply this patch on the Felipe's usb.git / testing/next branch,
but I couldn't apply because the udc-core.c was renamed to core.c.
https://git.kernel.org/cgit/linux/kernel/git/balbi/usb.git/commit/?h=testing/next&id=a22b539c7082b6a3046b3a9cebb356a047a2d81d

I guess this patch needs rebase for that.

Best regards,
Yoshihiro Shimoda