Hi, Mark Brown <broonie@xxxxxxxxxx> writes: > On Wed, Apr 27, 2016 at 08:37:20AM +0300, Felipe Balbi wrote: >> Jisheng Zhang <jszhang@xxxxxxxxxxx> 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 <joke> it can, just source VBUS from a lab power supply </joke> > this to be just a normal regulator_get(). jokes aside, this regulator is optional because not all platforms require a SW controlled regulator, no ? Will normal regulator_get() give us a dummy regulator in case it's not listed in DT/ACPI ? -- balbi
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