tree 910e69df6f0774bfc5cd53bd29b84024ee1c54ee
parent 5f9c8447af1c316d3a0163055238ed8351580d00
author Samuel Holland <samuel@sholland.org> 1657856093 -0500
committer Andre Przywara <andre.przywara@arm.com> 1682641840 +0100

phy: sun4i-usb: Do not drive VBUS with external VBUS present

It is possible to use host-side USB with externally-provided VBUS. For
example, some USB OTG cables have an extra power input which powers
both the board and the USB peripheral.

To support this setup, skip enabling the VBUS switch/regulator if VBUS
voltage is already present. This behavior matches the Linux PHY driver.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>