Hi Shimoda-san,
On Thu, Sep 6, 2018 at 12:09 PM Yoshihiro Shimoda
<yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
> > From: Geert Uytterhoeven, Sent: Wednesday, September 5, 2018 9:59 PM
> > On Fri, Aug 31, 2018 at 10:22 AM Yoshihiro Shimoda
> > <yoshihiro.shimoda.uh@xxxxxxxxxxx> wrote:
> > > R-Car Gen3 needs to enable/deassert clocks/resets of both usb 2.0
> > > host (included phy) and peripheral. Otherwise, other side device
> > > cannot work correctly. So, this patch revises properties of clocks
> > > and resets. After that, each device driver can enable/deassert
> > > clocks/resets by its self.
> > >
> > > Notes:
> > > - To work the renesas_usbhs driver correctly when host side drivers
> > > are disabled and the renesas_usbhs driver doesn't have multiple
> > > clock management, this patch doesn't change the order of the clocks
> > > property in each hsusb node.
> > > - This patch doesn't have any side-effects even if the renesas_usbhs
> > > driver doesn't have reset_control and multiple clock management.
> > >
> > > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> >
> > Thanks for your patch!
> >
> > I'm a bit confused about the HS-USB <-> EHCI/OHCI topology.
> > Can you please explain?
> >
> > Thanks!
>
> HS-USB <-> EHCI/OHCI topology on R-Car H3 is:
>
> EHCI/OHCI ch0/3 ---+--- PHY (is included on the EHCI/OHCI) --- External pins
> HS-USB ch0/3 ---+
>
> EHCI ch1/2 ------- PHY (is included on the EHCI/OHCI) --- External pins
> # These channels don't have HS-USB.
Thanks, that's the part is missed, and couldn't find immediately in the
HW manual.
So HS-USB is the usb device ("gadget") part, and EHCI/OHCI is the
usb host part?
>
> And module stops and resets of HS-USB and EHCI/OHCI topology on R-Car H3 is:
>
> MSTP/RST703 ---+(OR)---+--- EHCI/OHCI ch0
> MSTP/RST704 ---+ +--- HS-USB ch0
>
> MSTP/RST702 --------------- EHCI/OHCI ch1
> MSTP/RST701 --------------- EHCI/OHCI ch2
>
> MSTP/RST700 ---+(OR)---+--- EHCI/OHCI ch3
> MSTP/RST705 ---+ +--- HS-USB ch3
>
> Should I describe these topology on the commit log or somewhere?
Yes, I think that would be helpful.
Thanks!
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
