linux-kernel - Re: [PATCH v3 10/11] usb: otg: Add dual-role device (DRD) support

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Date:	Mon, 20 Jul 2015 09:23:09 +0800
From:	Peter Chen <peter.chen@...escale.com>
To:	Roger Quadros <rogerq@...com>
CC:	Li Jun <b47624@...escale.com>, <stern@...land.harvard.edu>,
	<balbi@...com>, <gregkh@...uxfoundation.org>,
	<dan.j.williams@...el.com>, <jun.li@...escale.com>,
	<mathias.nyman@...ux.intel.com>, <tony@...mide.com>,
	<Joao.Pinto@...opsys.com>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH v3 10/11] usb: otg: Add dual-role device (DRD) support

On Fri, Jul 17, 2015 at 01:47:12PM +0300, Roger Quadros wrote:
> >> + * DRD mode hardware Inputs
> >> + *
> >> + * @id:		TRUE for B-device, FALSE for A-device.
> >> + * @vbus:	VBUS voltage in regulation.
> >> + *
> >>   * OTG hardware Inputs
> >>   *
> >>   *	Common inputs for A and B device
> >> @@ -122,7 +127,8 @@ enum otg_fsm_timer {
> >>   */
> >>  struct otg_fsm {
> >>  	/* Input */
> >> -	int id;
> >> +	int id;			/* DRD + OTG */
> >> +	int vbus;		/* DRD only */
> > 
> > Existing b_sess_vld can be also used for drd only case, no need create
> > a new flag.
> 
> b_sess_vld is a bit confusing to people not familiar with OTG.
> My suggestion is to use dedicated 'vbus' flag for DRD case
> for simplicity.
> 

Since OTG DRD is the subset in OTG FSM (FSM, data structure, APIs, etc),
I agree with Jun to reuse existing variables, and we can add some comments
for b_sess_vld if needed.


> > 
> >>  	int adp_change;
> >>  	int power_up;
> >>  	int a_srp_det;
> 
> cheers,
> -roger

-- 

Best Regards,
Peter Chen
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