From: Peter Chen <hzpeterchen@gmail.com>
To: Roger Quadros <rogerq@ti.com>
Cc: peter.chen@freescale.com, balbi@kernel.org, tony@atomide.com,
gregkh@linuxfoundation.org, dan.j.williams@intel.com,
mathias.nyman@linux.intel.com, Joao.Pinto@synopsys.com,
sergei.shtylyov@cogentembedded.com, jun.li@freescale.com,
grygorii.strashko@ti.com, yoshihiro.shimoda.uh@renesas.com,
robh@kernel.org, nsekhar@ti.com, b-liu@ti.com, joe@perches.com,
linux-usb@vger.kernel.org, linux-omap@vger.kernel.org,
linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v10 13/14] usb: gadget: udc: adapt to OTG core
Date: Mon, 13 Jun 2016 15:40:56 +0800 [thread overview]
Message-ID: <20160613074056.GC19728@shlinux2> (raw)
In-Reply-To: <575E62D7.8010409@ti.com>
On Mon, Jun 13, 2016 at 10:37:59AM +0300, Roger Quadros wrote:
> On 13/06/16 10:20, Peter Chen wrote:
> > On Mon, Jun 13, 2016 at 10:14:31AM +0300, Roger Quadros wrote:
> >> On 12/06/16 14:36, Peter Chen wrote:
> >>> On Fri, Jun 10, 2016 at 04:07:22PM +0300, Roger Quadros wrote:
> >>>>
> >>>> +/**
> >>>> + * usb_otg_add_gadget_udc - adds a new gadget to the udc class driver list
> >>>> + * @parent: the parent device to this udc. Usually the controller
> >>>> + * driver's device.
> >>>
> >>> It seems it should be udc device
> >>
> >> Parent and udc->dev are not the same right?
> >
> > Sure, udc's parent is otg device.
> >
> >>
> >> I guess i'll omit the second statement to avoid confusion. So.
> >>
> >> @parent: the parent device to this udc.
> >
> > Where you call below APIs? It seems to be a udc driver, right?
> > So, when you try to get "otg-controller" from the node, this node
> > should be udc.
>
> @parent is actually the device that represents the USB Device controller
> in the device tree. When you call usb_add_gadget_udc_release() a new
> udc->dev device is created as it's child.
>
> See explanation for the @parent argument in usb_add_gadget_udc_release().
> As we want to keep the parent argument identical to that I will not make
> any changes then.
Oh, yes. The parent should be glue layer udc device or the dual-role controller
device.
Peter
>
> >
> > /**
> > * usb_otg_add_gadget_udc - adds a new gadget to the udc class driver list
> > * @parent: the parent device to this udc. Usually the controller
> > * driver's device.
> > * @gadget: the gadget to be added to the list
> > * @otg_dev: the OTG controller device
> > *
> > * If otg_dev is NULL then device tree node is checked
> > * for OTG controller via the otg-controller property.
> > * Returns zero on success, negative errno otherwise.
> > */
> > int usb_otg_add_gadget_udc(struct device *parent, struct usb_gadget *gadget,
> > struct device *otg_dev)
> > {
> > if (!otg_dev) {
> > gadget->otg_dev = of_usb_get_otg(parent->of_node);
> > if (!gadget->otg_dev)
> > return -ENODEV;
> > } else {
> > gadget->otg_dev = otg_dev;
> > }
> >
> > return usb_add_gadget_udc_release(parent, gadget, NULL);
> > }
> > EXPORT_SYMBOL_GPL(usb_otg_add_gadget_udc);
> >
>
> --
> cheers,
> -roger
--
Best Regards,
Peter Chen
next prev parent reply other threads:[~2016-06-13 7:47 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-10 13:07 [PATCH v10 00/14] USB OTG/dual-role framework Roger Quadros
2016-06-10 13:07 ` [PATCH v10 01/14] usb: hcd: Initialize hcd->flags to 0 Roger Quadros
2016-06-14 8:16 ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 02/14] usb: otg-fsm: Prevent build warning "VDBG" redefined Roger Quadros
2016-06-10 13:07 ` [PATCH v10 03/14] usb: hcd.h: Add OTG to HCD interface Roger Quadros
2016-06-14 8:17 ` Roger Quadros
2016-06-14 14:21 ` Alan Stern
2016-06-15 7:14 ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 04/14] usb: otg-fsm: use usb_otg wherever possible Roger Quadros
2016-06-10 13:07 ` [PATCH v10 05/14] usb: otg-fsm: move host controller operations into usb_otg->hcd_ops Roger Quadros
2016-06-10 13:07 ` [PATCH v10 06/14] usb: gadget.h: Add OTG to gadget interface Roger Quadros
2016-06-12 9:13 ` Peter Chen
2016-06-20 7:21 ` Felipe Balbi
2016-06-20 7:28 ` Roger Quadros
2016-06-20 8:13 ` Felipe Balbi
2016-06-20 8:25 ` Roger Quadros
2016-06-20 9:24 ` Felipe Balbi
2016-06-20 9:43 ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 07/14] usb: otg: get rid of CONFIG_USB_OTG_FSM in favour of CONFIG_USB_OTG Roger Quadros
2016-06-10 13:07 ` [PATCH v10 08/14] usb: otg: add OTG/dual-role core Roger Quadros
2016-06-12 11:21 ` Peter Chen
2016-06-13 7:42 ` Roger Quadros
2016-06-13 7:56 ` [PATCH v11 " Roger Quadros
2016-06-13 7:58 ` Peter Chen
2016-06-20 7:45 ` Felipe Balbi
2016-06-20 10:13 ` Roger Quadros
2016-06-20 12:03 ` Felipe Balbi
2016-06-20 12:26 ` Roger Quadros
2016-06-20 12:46 ` Felipe Balbi
2016-06-21 6:39 ` Peter Chen
2016-06-21 7:19 ` Felipe Balbi
2016-06-21 8:02 ` Peter Chen
2016-06-21 8:18 ` Felipe Balbi
2016-06-21 9:14 ` Peter Chen
2016-06-21 12:35 ` Felipe Balbi
2016-06-21 13:12 ` Peter Chen
2016-06-21 14:47 ` Felipe Balbi
2016-06-22 3:33 ` Peter Chen
2016-06-22 6:51 ` Felipe Balbi
2016-06-22 7:30 ` Peter Chen
2016-06-22 8:00 ` Felipe Balbi
2016-06-23 7:41 ` Yoshihiro Shimoda
2016-06-21 2:30 ` Yoshihiro Shimoda
2016-06-21 7:21 ` Felipe Balbi
2016-06-20 11:49 ` Peter Chen
2016-06-20 12:08 ` Felipe Balbi
2016-06-21 6:05 ` Peter Chen
2016-06-21 7:26 ` Felipe Balbi
2016-06-21 9:07 ` Peter Chen
2016-06-21 10:02 ` Felipe Balbi
2016-06-21 10:43 ` Tony Lindgren
2016-06-21 10:56 ` Felipe Balbi
2016-06-21 13:05 ` Peter Chen
2016-06-22 6:56 ` Felipe Balbi
2016-06-22 7:33 ` Peter Chen
2016-06-22 8:03 ` Felipe Balbi
2016-06-22 7:49 ` Roger Quadros
2016-06-22 8:14 ` Felipe Balbi
2016-06-22 8:30 ` Roger Quadros
2017-01-19 11:56 ` Vivek Gautam
2017-01-19 12:15 ` Roger Quadros
2017-01-19 15:15 ` vivek.gautam
2017-01-20 8:30 ` Roger Quadros
2017-01-20 11:39 ` Vivek Gautam
2016-06-23 7:42 ` Yoshihiro Shimoda
2016-06-10 13:07 ` [PATCH v10 09/14] usb: of: add an API to get OTG device from USB controller node Roger Quadros
2016-06-13 8:13 ` Jun Li
2016-06-13 8:16 ` Roger Quadros
2016-06-13 8:23 ` [PATCH v11 " Roger Quadros
2016-06-10 13:07 ` [PATCH v10 10/14] usb: otg: add hcd companion support Roger Quadros
2016-06-10 13:07 ` [PATCH v10 11/14] usb: otg: use dev_vdbg() instead of VDBG() Roger Quadros
2016-06-10 13:07 ` [PATCH v10 12/14] usb: hcd: Adapt to OTG core Roger Quadros
2016-06-14 8:17 ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 13/14] usb: gadget: udc: adapt " Roger Quadros
2016-06-12 11:36 ` Peter Chen
2016-06-13 7:14 ` Roger Quadros
2016-06-13 7:20 ` Peter Chen
2016-06-13 7:37 ` Roger Quadros
2016-06-13 7:40 ` Peter Chen [this message]
2016-06-13 7:55 ` [PATCH v11 " Roger Quadros
2016-06-13 7:56 ` Peter Chen
2016-06-13 8:06 ` Roger Quadros
2016-06-10 13:07 ` [PATCH v10 14/14] usb: host: xhci-plat: Add otg device to platform data Roger Quadros
2016-06-14 8:18 ` Roger Quadros
2016-06-14 2:17 ` [PATCH v10 00/14] USB OTG/dual-role framework Peter Chen
2016-06-14 8:12 ` Roger Quadros
2016-06-16 11:07 ` Roger Quadros
2016-06-17 7:17 ` Felipe Balbi
2016-06-17 7:31 ` Roger Quadros
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