On Sun, Feb 11, 2018 at 02:15:40PM +0200, Yossi Mansharoff wrote: > On the db410c 96boards platform we have a TC7USB40MU on the board > to mux the D+/D- lines coming from the controller between a micro > usb "device" port and a USB hub for "host" roles[1]. During a > role switch, we need to toggle this mux to forward the D+/D- > lines to either the port or the hub. Add the necessary code to do > the role switch in chipidea core via the generic mux framework. > Board configurations like on db410c are expected to change roles > via the sysfs API described in > Documentation/ABI/testing/sysfs-platform-chipidea-usb2. > > [1] https://github.com/96boards/documentation/raw/master/ConsumerEdition/DragonBoard-410c/HardwareDocs/Schematics_DragonBoard.pdf > > Cc: Peter Rosin <peda@xxxxxxxxxx> > Cc: Peter Chen <peter.chen@xxxxxxx> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > Cc: <devicetree@xxxxxxxxxxxxxxx> > Signed-off-by: Stephen Boyd <stephen.boyd@xxxxxxxxxx> > > Signed-off-by: Yossi Mansharoff <yossim@xxxxxxxxxxxxxx> > --- > Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 6 ++++++ > drivers/usb/chipidea/Kconfig | 2 ++ > drivers/usb/chipidea/core.c | 6 ++++++ > drivers/usb/chipidea/host.c | 7 +++++++ > drivers/usb/chipidea/udc.c | 13 ++++++++++++- > include/linux/usb/chipidea.h | 2 ++ > 6 files changed, 35 insertions(+), 1 deletion(-) > > diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > index 0e03344..2e93181 100644 > --- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > +++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt > @@ -76,6 +76,10 @@ Optional properties: > needs to make sure it does not send more than 90% > maximum_periodic_data_per_frame. The use case is multiple transactions, but > less frame rate. > +- mux-controls: The mux control for toggling host/device output of this > + controller. It's expected that a mux state of 0 indicates device mode and a > + mux state of 1 indicates host mode. > +- mux-control-names: Shall be "usb_switch" if mux-controls is specified. Kind of pointless to have -names when there is only one. Otherwise, the binding looks okay to me. > > i.mx specific properties > - fsl,usbmisc: phandler of non-core register device, with one > @@ -102,4 +106,6 @@ Example: > rx-burst-size-dword = <0x10>; > extcon = <0>, <&usb_id>; > phy-clkgate-delay-us = <400>; > + mux-controls = <&usb_switch>; > + mux-control-names = "usb_switch"; > }; -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
