On Thu, May 18, 2017 at 09:58:00AM +0200, Patrice Chotard wrote:
From: Patrice Chotard patrice.chotard@st.com
This deassert counter allow to manage "shared" reset lines encountered in some specific case. On STiH410 SoC, DWC3, EHCI and OHCI are all using a respective PHY, but all of these PHYs shared a "global" reset.
Currently, during command "usb stop", all host controller are stopped (XHCI, EHCI and OHCI). XHCI is first shutdowned, which means that PHY global reset is asserted. Then EHCI is shutdowned, but its PHY reset has already been asserted which make handshake() call failed in ehci_shutdown().
This counter allows to really assert a reset lines only when the "last" user is asserting it.
Signed-off-by: Patrice Chotard patrice.chotard@st.com Reviewed-by: Simon Glass sjg@chromium.org
Applied to u-boot/master, thanks!