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

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Message-ID: <20150123162443.GH8585@saruman.tx.rr.com>
Date:	Fri, 23 Jan 2015 10:24:43 -0600
From:	Felipe Balbi <balbi@...com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:	Felipe Balbi <balbi@...com>,
	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

Hi,

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.

-- 
balbi

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