linux-kernel - RE: [PATCH v11 08/14] usb: otg: add OTG/dual-role core

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Date:	Tue, 21 Jun 2016 02:30:22 +0000
From:	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:	Roger Quadros <rogerq@...com>, Felipe Balbi <balbi@...nel.org>,
	"peter.chen@...escale.com" <peter.chen@...escale.com>
CC:	"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>,
	"joe@...ches.com" <joe@...ches.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 v11 08/14] usb: otg: add OTG/dual-role core

Hi Roger,

> From: Roger Quadros
> Sent: Monday, June 20, 2016 7:13 PM
> 
> Hi,
> 
> On 20/06/16 10:45, Felipe Balbi wrote:
< snip >
> >> diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
> >> index f4fc0aa..1d74fb8 100644
> >> --- a/include/linux/usb/gadget.h
> >> +++ b/include/linux/usb/gadget.h
> >> @@ -328,6 +328,7 @@ struct usb_gadget_ops {
> >>   * @in_epnum: last used in ep number
> >>   * @mA: last set mA value
> >>   * @otg_caps: OTG capabilities of this gadget.
> >> + * @otg_dev: OTG controller device, if needs to be used with OTG core.
> >
> > do you really know of any platform which has a separate OTG controller?
> >
> 
> Andrew had pointed out in [1] that Tegra210 has separate blocks for OTG, host
> and gadget.
> 
> [1] http://article.gmane.org/gmane.linux.ports.tegra/22969
> 
> Yoshihiro,
> 
> How is the dual-role architecture on your Renesas platform?

About the dual-role architecture, Renesas platform (R-Car H3) has a USB 2.0 host controller (EHCI/OHCI)
with OTG function and a separate USB 2.0 peripheral controller (HS-USB).
The OTG function is related to some PHY control registers, so I intend to add the OTG/Dual-role core
support into the phy driver (drivers/phy/phy-rcar-gen3-usb2.c).

Best regards,
Yoshihiro Shimoda