Hi, On Thu, Feb 13, 2014 at 02:54:38PM -0800, Tony Lindgren wrote: > * Markus Pargmann <m...@pengutronix.de> [140111 06:03]: > > The PMIC is using usb0 vbus line as power source. It is also connected > > to the am335x processor as vbus sense. But there is no possibility to > > pullup usb0 vbus to operate as host. This patch fixes the dr_mode of usb0. > > That's the MUSB? AFAIK it's not possible to operate MUSB in peripheral > only mode because the hardware does what it wants based on the ID > pin state.
Yes that's MUSB. The am335x reference manual describes that it is possible to force peripheral/host mode by setting bit 7 (IDDIG_MUX) in register USBnMODE to 1. Then it uses the bit written in bit 8 (IDDIG) of register USBnMODE to set host/peripheral mode. I am not sure if the driver supports it yet but I think the DTS should contain the correct mode nevertheless, especially to avoid starting the otg loops in the musb driver. Regards, Markus -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
