linux-kernel - Re: [PATCH 1/4] drivers: usb: phy: add a new driver for usb part of control module

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Message-ID: <20130118121336.GE4672@arwen.pp.htv.fi>
Date:	Fri, 18 Jan 2013 14:13:36 +0200
From:	Felipe Balbi <balbi@...com>
To:	kishon <kishon@...com>
CC:	<balbi@...com>, <rob.herring@...xeda.com>, <rob@...dley.net>,
	<tony@...mide.com>, <b-cousson@...com>,
	<linux-usb@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-omap@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-doc@...r.kernel.org>, <devicetree-discuss@...ts.ozlabs.org>,
	<grant.likely@...retlab.ca>, <linux@....linux.org.uk>,
	<gregkh@...uxfoundation.org>
Subject: Re: [PATCH 1/4] drivers: usb: phy: add a new driver for usb part of
 control module

Hi,

On Fri, Jan 18, 2013 at 05:40:04PM +0530, kishon wrote:
> >>+void omap_control_usb_host_mode(struct device *dev)
> >>+{
> >>+	u32 val;
> >>+	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);
> >>+
> >>+	val = AVALID | VBUSVALID;
> >>+
> >>+	writel(val, control_usb->otghs_control);
> >
> >I would like to make this future proof too:
> >
> >val = readl(ctrl->otghs_control);
> >val |= OMAP_CTRL_DEV_AVALID | OMAP_CTRL_DEV_VBUSVALID;
> >writel(val, ctrl->otghs_control);
> 
> I think we might then have to add
> val &= ~(IDDIG | SESSEND) right?

right, my bad ;-)

> >Another idea is to try to get the extra resource below, if it fails you
> >try to continue without it ;-)
> 
> I prefer the way it is now because mailbox is needed for MUSB to be
> functional in OMAP4 and we should fail if we don't have it. No?

could be, that would mean an error on DT data though.

-- 
balbi

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