On Thu, Jul 13, 2017 at 03:35:02PM -0700, Stephen Boyd wrote: > Quoting Peter Rosin (2017-07-11 22:04:46) > > 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 > > Ok. I'll add a select to the chipidea driver. > > > > > > 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 > > Oh this is a typo. I mean "OE" pin. > > > > mux outputs. > > > > Maybe no need for a compatible update either, if it works to do something > > like this in the DT? Please keep the compatible. Use "gpio-mux" as a fallback if you wish. Rob -- 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
