Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752923AbbENHpN (ORCPT ); Thu, 14 May 2015 03:45:13 -0400 Received: from mail-wg0-f48.google.com ([74.125.82.48]:34175 "EHLO mail-wg0-f48.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751494AbbENHpJ (ORCPT ); Thu, 14 May 2015 03:45:09 -0400 Date: Thu, 14 May 2015 08:45:04 +0100 From: Lee Jones To: Jon Hunter Cc: Andrew Bresticker , Stephen Warren , Thierry Reding , Alexandre Courbot , "devicetree@vger.kernel.org" , "linux-tegra@vger.kernel.org" , "linux-usb@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Samuel Ortiz Subject: Re: [PATCH v8 4/9] mfd: Add binding document for NVIDIA Tegra XUSB Message-ID: <20150514074504.GB22418@x1> References: <1430761002-9327-1-git-send-email-abrestic@chromium.org> <1430761002-9327-5-git-send-email-abrestic@chromium.org> <20150513143954.GA3394@x1> <20150513165014.GC19543@x1> <20150514072954.GD20358@x1> <55544F91.4060402@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <55544F91.4060402@nvidia.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4678 Lines: 114 On Thu, 14 May 2015, Jon Hunter wrote: > > On 14/05/15 08:29, Lee Jones wrote: > > On Wed, 13 May 2015, Andrew Bresticker wrote: > > > >> On Wed, May 13, 2015 at 9:50 AM, Lee Jones wrote: > >>> On Wed, 13 May 2015, Andrew Bresticker wrote: > >>> > >>>> Lee, > >>>> > >>>> On Wed, May 13, 2015 at 7:39 AM, Lee Jones wrote: > >>>>> On Mon, 04 May 2015, Andrew Bresticker wrote: > >>>>> > >>>>>> Add a binding document for the XUSB host complex on NVIDIA Tegra124 > >>>>>> and later SoCs. The XUSB host complex includes a mailbox for > >>>>>> communication with the XUSB micro-controller and an xHCI host-controller. > >>>>>> > >>>>>> Signed-off-by: Andrew Bresticker > >>>>>> Cc: Rob Herring > >>>>>> Cc: Pawel Moll > >>>>>> Cc: Mark Rutland > >>>>>> Cc: Ian Campbell > >>>>>> Cc: Kumar Gala > >>>>>> Cc: Samuel Ortiz > >>>>>> Cc: Lee Jones > >>>>>> --- > >>>>>> Changes from v7: > >>>>>> - Move non-shared resources into child nodes. > >>>>>> New for v7. > >>>>>> --- > >>>>>> .../bindings/mfd/nvidia,tegra124-xusb.txt | 37 ++++++++++++++++++++++ > >>>>>> 1 file changed, 37 insertions(+) > >>>>>> create mode 100644 Documentation/devicetree/bindings/mfd/nvidia,tegra124-xusb.txt > >>>>>> > >>>>>> diff --git a/Documentation/devicetree/bindings/mfd/nvidia,tegra124-xusb.txt b/Documentation/devicetree/bindings/mfd/nvidia,tegra124-xusb.txt > >>>>>> new file mode 100644 > >>>>>> index 0000000..bc50110 > >>>>>> --- /dev/null > >>>>>> +++ b/Documentation/devicetree/bindings/mfd/nvidia,tegra124-xusb.txt > >>>>>> @@ -0,0 +1,37 @@ > >>>>>> +NVIDIA Tegra XUSB host copmlex > >>>>>> +============================== > >>>>>> + > >>>>>> +The XUSB host complex on Tegra124 and later SoCs contains an xHCI host > >>>>>> +controller and a mailbox for communication with the XUSB micro-controller. > >>>>>> + > >>>>>> +Required properties: > >>>>>> +-------------------- > >>>>>> + - compatible: For Tegra124, must contain "nvidia,tegra124-xusb". > >>>>>> + Otherwise, must contain '"nvidia,-xusb", "nvidia,tegra124-xusb"' > >>>>>> + where is tegra132. > >>>>>> + - reg: Must contain the base and length of the XUSB FPCI registers. > >>>>>> + - ranges: Bus address mapping for the XUSB block. Can be empty since the > >>>>>> + mapping is 1:1. > >>>>>> + - #address-cells: Must be 2. > >>>>>> + - #size-cells: Must be 2. > >>>>>> + > >>>>>> +Example: > >>>>>> +-------- > >>>>>> + usb@0,70098000 { > >>>>>> + compatible = "nvidia,tegra124-xusb"; > >>>>>> + reg = <0x0 0x70098000 0x0 0x1000>; > >>>>>> + ranges; > >>>>>> + > >>>>>> + #address-cells = <2>; > >>>>>> + #size-cells = <2>; > >>>>>> + > >>>>>> + usb-host@0,70090000 { > >>>>>> + compatible = "nvidia,tegra124-xhci"; > >>>>>> + ... > >>>>>> + }; > >>>>>> + > >>>>>> + mailbox { > >>>>>> + compatible = "nvidia,tegra124-xusb-mbox"; > >>>>>> + ... > >>>>>> + }; > >>>>> > >>>>> This doesn't appear to be a proper MFD. I would have the USB and > >>>>> Mailbox devices probe seperately and use a phandle to point the USB > >>>>> device to its Mailbox. > >>>>> > >>>>> usb@xyz { > >>>>> mboxes = <&xusb-mailbox, [chan]>; > >>>>> }; > >>>> > >>>> Then what will set up the shared regmap? The point of using an MFD > >>>> here was to share a register set with both the mailbox and xHCI > >>>> drivers and avoid having to map the same register set twice in two > >>>> separate drivers. > >>> > >>> Can you share the mapping please? > >> > >> What do you mean? That's what the MFD is doing now by setting up an > >> MMIO regmap to be shared between the two devices. > > > > I mean, can you share the documentation with me. :) > > You can download the documentation from here [1]. See chapter 19 USB > complex. However, I will warn you that unfortunately, you need to sign > up for an account :-( I'll give that a miss for the time being. See my other mail for now. -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/