From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 044F9CCA47F for ; Thu, 23 Jun 2022 19:19:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229576AbiFWTTA (ORCPT ); Thu, 23 Jun 2022 15:19:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39130 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229498AbiFWTSm (ORCPT ); Thu, 23 Jun 2022 15:18:42 -0400 Received: from mail-oa1-x29.google.com (mail-oa1-x29.google.com [IPv6:2001:4860:4864:20::29]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 88ECD33EAB for ; Thu, 23 Jun 2022 11:24:16 -0700 (PDT) Received: by mail-oa1-x29.google.com with SMTP id 586e51a60fabf-101dc639636so531393fac.6 for ; Thu, 23 Jun 2022 11:24:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=mime-version:in-reply-to:references:from:user-agent:date:message-id :subject:to:cc; bh=7KHPbnVlHnkB0EVrXTQL+f9XDuEF911Owwju7ndnO+8=; b=limsfAyKYwLYVD3+t6n9NGH70Er6BQNn9CewVXcuC79xXTCHbq+EpwRtFynJnAABb+ Udmnfdc3hKWQe+U1Bz1e3EefOpEcrWENgi3SzraOMfBwt7ACXA0EXag0R5dnndzUpd0l MyHPFG5pARv5QWIDZ2uIIlw0r/9lq0WLQp6vw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:in-reply-to:references:from :user-agent:date:message-id:subject:to:cc; bh=7KHPbnVlHnkB0EVrXTQL+f9XDuEF911Owwju7ndnO+8=; b=I+KxI2ugePDGfyz+UYt1TEM0r2LcxdMnh5XoBn2BBaFDc37NBn+1mhxXQBJ1BZabN8 hvNYunh3yiVT8BBofBLXtQDNsPtLzwYsi/GWQa4M4wd+KBEqn4Z+Nw5GJ/+LxFWuTx3o IMNCz2wEUEZ9eZ3TW2NZ1//JSijebc033cEEp/KwJHzJZNb9hp/to59ghG9HoSI52i1P D/BZI+9r3Zgt+5jrqz68ePaBVA3njKt/Gj8YG4iN7fVGNyuRjt48l7yAnMDvSn/dVjK2 APG1mKyhIAun279YKrIcXD5NZA915+ivqOEnOIvOFZqJ2wVD1ZiAxWzK+LpIp9dVTMcB Rrfg== X-Gm-Message-State: AJIora8hWVzcTfqeo6+DqipwX+8pfi8AdZEQ3I5x9zXJEwSeBnRUNAO4 30NC/XlShpEMwvjoED6xPWYB6K9xkGh+OlOBpfgXoQ== X-Google-Smtp-Source: AGRyM1uhIlpWAbcw8cS7wBzEeQ5p5CUBwyJ92Exd/1lBwAueqZGyRgRUnjHMsJ5S9ITyrl2U2VT9T3e8pQbKYfsOYPY= X-Received: by 2002:a05:6870:b627:b0:102:f25:a460 with SMTP id cm39-20020a056870b62700b001020f25a460mr3149970oab.193.1656008654604; Thu, 23 Jun 2022 11:24:14 -0700 (PDT) Received: from 753933720722 named unknown by gmailapi.google.com with HTTPREST; Thu, 23 Jun 2022 14:24:13 -0400 MIME-Version: 1.0 In-Reply-To: <20220622173605.1168416-7-pmalani@chromium.org> References: <20220622173605.1168416-1-pmalani@chromium.org> <20220622173605.1168416-7-pmalani@chromium.org> From: Stephen Boyd User-Agent: alot/0.10 Date: Thu, 23 Jun 2022 14:24:13 -0400 Message-ID: Subject: Re: [PATCH v5 6/9] dt/bindings: drm/bridge: it6505: Add mode-switch support To: Prashant Malani , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org Cc: bleung@chromium.org, heikki.krogerus@linux.intel.com, Pin-Yen Lin , Allen Chen , Andrzej Hajda , AngeloGioacchino Del Regno , Daniel Vetter , David Airlie , devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, Greg Kroah-Hartman , Hsin-Yi Wang , Jernej Skrabec , Jonas Karlman , =?UTF-8?B?Sm9zw6kgRXhww7NzaXRv?= , Krzysztof Kozlowski , Laurent Pinchart , Maxime Ripard , Neil Armstrong , =?UTF-8?B?TsOtY29sYXMgRi4gUi4gQS4gUHJhZG8=?= , Robert Foss , Rob Herring , Sam Ravnborg , Thomas Zimmermann , Xin Ji Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Quoting Prashant Malani (2022-06-22 10:34:35) > From: Pin-Yen Lin > > ITE IT6505 can be used in systems to switch USB Type-C DisplayPort > alternate mode lane traffic between 2 Type-C ports. How does it work? From what I can tell from the information I find when googling this part[1] and looking at the existing binding doc is that this device is a DPI to DP bridge, and it outputs DP (probably 4 lanes of it?). Does the 2 type-c port design work by transmitting DP on two lanes of DP for one type-c port and another two lanes of DP for the other type-c port? DP could be one lane, so if this device is able to output one lane on any output differential pair then I suspect it could support 4 type-c ports if the hardware engineer connected it that way. Can you confirm my suspicion? [1] https://www.ite.com.tw/en/product/view?mid=45