On 2017-07-12 03:02, Stephen Boyd wrote: > This patchset adds support for the TC7USB40MU usb mux found on > db410c 96boards platforms via the new multiplexer framework and > hooks that into the chipidea driver. This allows us to properly > control host or device mode on this board via the sysfs knob. > > So far I've only tested this on db410c, and there are some rough > edges to finish off before it can merge. Also I'm experiencing > odd behavior with switching the role while gadget is enabled and > the micro-usb cable is kept connected. Not sure what's wrong but > it seems like the gadget never gets disconnected? I'll investigate > more. > > TODO: > > 1. The mux framework has to be selected for consumers to use it. We'll > need some stubs in the consumer header file to allow compilation to > continue without mux always enabled by consumers. Instead of "depends on MULTIPLEXER", just add "select MULTIPLEXER" to the Kconfig. Otherwise, you'll have to convince Linus that we really do need a Kconfig question for the subsystem :-) https://lkml.org/lkml/2017/7/4/118 > 2. We probably need some sort of mux_control_get_optional() API so that > we know if there was an error getting the mux control, instead of just > ignoring errors. For now I can pass up EPROBE_DEFER errors and ignore > other errors and consider it "missing from DT". Yes, mux_control_get_optional should be easy to add. > 3. Maybe we can get rid of the mux driver and just use mux-gpio.c with > a compatible string update? I split it off because we may want to > support the "S" pin on the TC7USB40MU one day that shuts off both > mux outputs. Maybe no need for a compatible update either, if it works to do something like this in the DT? usb_switch: usb-switch { compatible = "gpio-mux"; mux-gpios = <&pm8916_gpios 4 GPIO_ACTIVE_HIGH>, <&pm8916_gpios XXX GPIO_ACTIVE_XXX>; idle-state = <2>; #mux-control-cells = <0>; pinctrl-names = "default"; pinctrl-0 = <&usb_sw_sel_pm>; }; But I obviously know little about how things are wired and really works, so that might be totally off... Otherwise, maybe a generic mux-pinctrl driver would do the trick? (compare with drivers/i2c/muxes/i2c-mux-pinctrl.c) Cheers, peda > 4. The userspace side of things is murky. What is expected to go and toggle > the host/gadget side of things in userspace at this very specific location > for chipidea devices? > > Stephen Boyd (3): > usb: misc: Add a driver for TC7USB40MU > usb: chipidea: Hook into mux framework to toggle usb switch > arm64: dts: qcom: Collapse usb support into one node > > .../devicetree/bindings/usb/ci-hdrc-usb2.txt | 8 +++ > .../devicetree/bindings/usb/toshiba,tc7usb40mu.txt | 31 +++++++++ > arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi | 39 +++++++----- > arch/arm64/boot/dts/qcom/msm8916.dtsi | 62 +++++++++--------- > drivers/usb/chipidea/core.c | 17 +++++ > drivers/usb/chipidea/host.c | 10 +++ > drivers/usb/chipidea/udc.c | 11 ++++ > drivers/usb/misc/Kconfig | 11 ++++ > drivers/usb/misc/Makefile | 1 + > drivers/usb/misc/tc7usb40mu.c | 74 ++++++++++++++++++++++ > include/linux/usb/chipidea.h | 14 ++++ > 11 files changed, 228 insertions(+), 50 deletions(-) > create mode 100644 Documentation/devicetree/bindings/usb/toshiba,tc7usb40mu.txt > create mode 100644 drivers/usb/misc/tc7usb40mu.c > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
