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Date: Wed, 17 Dec 2014 14:35:30 +0300 From: Sergei Shtylyov <sergei.shtylyov@...entembedded.com> To: Peter Chen <Peter.Chen@...escale.com>, "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>, "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org> CC: "linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] usb: hcd: add OTG ID signal sensing Hello. On 12/17/2014 5:08 AM, Peter Chen wrote: >> On the Renesas R8A7791 SoC based boards there's MAX3355 USB OTG chip and >> mini-AB USB connector corresponding to USB port 0 driven either by EHCI/OHCI >> or Renesas USBHS gadget controller. And we'd like the host/gadget drivers to >> work based on the cable type connected. An 'extcon' driver for MAX3355 has >> been written, so we only need to bind to it via device tree which I'm doing in >> this patch. >> I wasn't able to find a solution better than checking the cable type at the host >> driver probe time and refusing to drive a host if B-cable is connected. > You may need a dual-role/otg driver to do it, which can enable host/device function > according to ID pin. It would have been too good if I had a dual-role controller. :-) But I have what I have. IIUC, such configuration (OHCI and UDC sharing a USB port) has been used on OMAP1. WBR, Sergei -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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