linux-kernel - Re: [PATCH 6/8] usb: dwc3: add ULPI interface support

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Message-ID: <20150126114610.GA28539@kuha.fi.intel.com>
Date:	Mon, 26 Jan 2015 13:46:10 +0200
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	Felipe Balbi <balbi@...com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Baolu Lu <baolu.lu@...ux.intel.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/8] usb: dwc3: add ULPI interface support

On Fri, Jan 23, 2015 at 10:24:43AM -0600, Felipe Balbi wrote:
> On Fri, Jan 23, 2015 at 05:12:56PM +0200, Heikki Krogerus wrote:
> > +int dwc3_ulpi_init(struct dwc3 *dwc)
> > +{
> > +	u32 reg;
> > +
> > +	/* First check USB2 PHY interface type */
> > +	switch (DWC3_GHWPARAMS3_HSPHY_IFC(dwc->hwparams.hwparams3)) {
> > +	case DWC3_GHWPARAMS3_HSPHY_IFC_UTMI_ULPI:
> > +		/* Select ULPI Interface */
> > +		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYCFG(0));
> > +		reg |= DWC3_GUSB2PHYCFG_ULPI_UTMI;
> > +		dwc3_writel(dwc->regs, DWC3_GUSB2PHYCFG(0), reg);
> > +		/* FALLTHROUGH */
> > +	case DWC3_GHWPARAMS3_HSPHY_IFC_ULPI:
> > +		break;
> > +	default:
> > +		return 0;
> > +	}
> > +
> > +	/* Register the interface */
> > +	dwc->ulpi = ulpi_register_interface(dwc->dev, &dwc3_ulpi);
> > +	if (IS_ERR(dwc->ulpi)) {
> 
> so, this will only build and link if DWC3_ULPI is enabled, in case of
> error you return early...
> 
> > +		dev_err(dwc->dev, "failed to register ULPI interface");
> > +		return PTR_ERR(dwc->ulpi);
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> > +void dwc3_ulpi_exit(struct dwc3 *dwc)
> > +{
> > +	if (dwc->ulpi) {
> 
> ... looks like this branch is unnecessary.

We can't do that, or distros that select DWC3_ULPI option can only use
dwc3 with hardware that really has ULPI PHY. So I guess we'll drop the
DWC3_ULPI option and build the dwc3 ulpi support always if ULPI bus is
enabled. OK?


Thanks,

-- 
heikki
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