Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758590AbaGATsL (ORCPT ); Tue, 1 Jul 2014 15:48:11 -0400 Received: from mail-vc0-f171.google.com ([209.85.220.171]:42144 "EHLO mail-vc0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757412AbaGATsJ (ORCPT ); Tue, 1 Jul 2014 15:48:09 -0400 MIME-Version: 1.0 In-Reply-To: <20140701180114.GA2082@qualcomm.com> References: <1404144233-17222-1-git-send-email-agross@codeaurora.org> <1404144233-17222-4-git-send-email-agross@codeaurora.org> <20140701180114.GA2082@qualcomm.com> From: Rob Herring Date: Tue, 1 Jul 2014 14:47:46 -0500 Message-ID: Subject: Re: [Patch v7 3/3] usb: dwc3: qcom: Add device tree binding To: Andy Gross Cc: Felipe Balbi , jackp@codeaurora.org, linux-arm-msm , Linux USB List , "linux-kernel@vger.kernel.org" , "Ivan T. Ivanov" , Kumar Gala , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 1, 2014 at 1:01 PM, Andy Gross wrote: > On Tue, Jul 01, 2014 at 12:04:35AM -0500, Rob Herring wrote: > > > >> > +- clock-names: Should contain the following: >> > + "core" Master/Core clock, have to be >= 125 MHz for SS >> > + operation and >= 60MHz for HS operation >> > + >> > +Optional clocks: >> > + "iface" System bus AXI clock. Not present on all platforms >> >> Really?, some platforms have a clockless bus? > > Some platforms require core and interface. The specific platform I tested on > does not have an iface clk. I'll take a look at the ipq block diagram to see if > they did something cute, but i don't believe there is one. Usually, that difference just means all the clock inputs are connected to the same clock source. But the binding should describe the inputs. If the dwc3 core has 3 clocks and your wrapper logic varies, I would say you should follow the dwc3 core and ignore the wrapper for purposes of the binding (unless there is some complex clock tree there). > > >> > + >> > + ranges; >> > + >> > + status = "disabled"; >> > + >> > + dwc3@11000000 { >> > + compatible = "snps,dwc3"; >> >> This sub-node is just wrong. Why can't you have a single node with ' >> "qcom,dwc3", "snps,dwc3" ' for the compatible property? All you are >> adding here is clocks. Does the Synopsys block have no clocks? >> >> I guess this is copied from other broken dwc3 bindings... That doesn't >> mean you have to copy it. > > The dwc3 core does not deal with clocks. That is why everyone has a wrapper. > That, in addition to pm, has to be handled from the wrapper. That's my take > anyway. I am sure Felipe can speak more to this. That is a Linux driver issue which is irrelevant to the binding. Rob -- 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/