On Thu, Dec 11, 2014 at 5:52 PM, David Laight <david.lai...@aculab.com> wrote: > From: Vivek Gautam >> This has been on my to-do list for sometime. >> Until now the host controller (specifically ehci-exynos) is responsible >> for enabling VBUS supply. This opens up one more issue which is, when >> only ohci-exynos is enabled and ehci-exynosis disabled then VBUS was >> never enabled (since ohci did not have the code to enabled the VBUS supply). >> >> Rather it should be wise to move the VBUS related stuff to phy driver and >> let phy take care of enabling it. >> >> This patch series adds that VBUS regulator to phy-samsung-usb2 driver, >> adds necessary binding information as well as vbus-supply properties >> to phy nodes on exynos5250 systems. > ... > > Does this go anyway to allowing devices to be powered from a micro-usb > connector while acting as a USB host (USB OTG). > ie when you want VBUS disabled even though it would normally > need to be enabled.
Sorry i didn't get your second line. This change allows HOST and HSIC phys to enable VBUS for the devices connected to it. Although now i think there can be a flaw in this approach when only in OTG mode, when DEVICE phy is being used, even then the regulator will be turned on causing power unnecessary consumption. -- Best Regards Vivek Gautam Samsung R&D Institute, Bangalore India -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
