On Wed, Apr 27, 2016 at 08:37:20AM +0300, Felipe Balbi wrote:
> Jisheng Zhang <jszhang@marvell.com> writes:

> > +	vbus = devm_regulator_get(&pdev->dev, "vbus");

> devm_regulator_get_optional() ??

Does USB work without a VBUS?  Unless the answer is yes then I'd expect
this to be just a normal regulator_get().

> 
> > +	if (PTR_ERR(vbus) == -ENODEV) {
> > +		vbus = NULL;
> > +	} else if (IS_ERR(vbus)) {
> > +		ret = PTR_ERR(vbus);
> > +		goto disable_clk;
> > +	} else if (vbus) {
> > +		ret = regulator_enable(vbus);
> > +		if (ret) {
> > +			dev_err(&pdev->dev,
> > +				"failed to enable usb vbus regulator: %d\n",
> > +				ret);
> > +			goto disable_clk;
> > +		}
> > +	}

This is all completely broken unless the supply is optional.