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 RD Institute, Bangalore
India
--
To unsubscribe from this list: send the line unsubscribe linux-samsung-soc in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
