From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752311Ab2CGFO2 (ORCPT ); Wed, 7 Mar 2012 00:14:28 -0500 Received: from mail-yx0-f202.google.com ([209.85.213.202]:36819 "EHLO mail-yx0-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750805Ab2CGFO1 (ORCPT ); Wed, 7 Mar 2012 00:14:27 -0500 From: Simon Glass To: LKML Cc: linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, Stephen Warren , Devicetree Discuss , Olof Johansson , Simon Glass Subject: [RESEND PATCH 1/3] arm: tegra: dts: Support host/device selection and legacy mode Date: Tue, 6 Mar 2012 21:04:32 -0800 Message-Id: <1331096674-8324-2-git-send-email-sjg@chromium.org> X-Mailer: git-send-email 1.7.7.3 In-Reply-To: <1331096674-8324-1-git-send-email-sjg@chromium.org> References: <1331096674-8324-1-git-send-email-sjg@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Some USB ports can support host and device operation. We add the dr_mode property (as found in Freescale) for this. One USB port has a 'legacy mode', left over from the days of pre-Tegra chips. I don't believe this is actually used, except that we must know to turn this off in the driver. Signed-off-by: Simon Glass --- .../devicetree/bindings/usb/tegra-usb.txt | 13 +++++++++++++ 1 files changed, 13 insertions(+), 0 deletions(-) diff --git a/Documentation/devicetree/bindings/usb/tegra-usb.txt b/Documentation/devicetree/bindings/usb/tegra-usb.txt index 035d63d..007005d 100644 --- a/Documentation/devicetree/bindings/usb/tegra-usb.txt +++ b/Documentation/devicetree/bindings/usb/tegra-usb.txt @@ -11,3 +11,16 @@ Required properties : - phy_type : Should be one of "ulpi" or "utmi". - nvidia,vbus-gpio : If present, specifies a gpio that needs to be activated for the bus to be powered. + +Optional properties: + - dr_mode : dual role mode. Indicates the working mode for + nvidia,tegra20-ehci compatible controllers. Can be "host", "peripheral", + or "otg". Default to "host" if not defined for backward compatibility. + host means this is a host controller + peripheral means it is device controller + otg means it can operate as either ("on the go") + - nvidia,has-legacy-mode : boolean indicates whether this controller can + operate in legacy mode (as APX 2500 / 2600). In legacy mode some + registers are accessed through the APB_MISC base address instead of + the USB controller. Since this is a legacy issue it probably does not + warrant a compatible string of its own. -- 1.7.7.3