From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.14]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41CBB2DCF6C; Wed, 11 Mar 2026 13:24:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773235453; cv=none; b=bpNL2vYYVuNNjEEwnGQHKywBZX3MrPtsAwYosChkc3sm3SKmhgubBa1JBkmjJGnyMrzp5JgbCNUQR9DlogfIC09vpUw9w3fzwiMkoJKrLptgf0C1ELyrIk0KbvBNR6NxdyiUlGBLfqUJ7DzIA6W1kgW+lwvrX4icw/GTbxltXJo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773235453; c=relaxed/simple; bh=JehtXIHbXXLGx9W63Y/jT3qPHXgfE5mWV1/AbmRDrTk=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=LR4Zio3jcpLcTcLTudq0U+lvR7/sjiwkh/0xOyqCtB65fkf1jZdTo6vO2HIN+g5wMn/iF7yR0myHljhPzN7hagReHc8qf/y4CR4F954AUx0079BwKuDYkf8DPAxdJ+EoBOjU9J0R2C+X7HQXtNeUOO8b8wB1flbtJch/KVnu2tE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=P75muh1h; arc=none smtp.client-ip=192.198.163.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="P75muh1h" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1773235451; x=1804771451; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=JehtXIHbXXLGx9W63Y/jT3qPHXgfE5mWV1/AbmRDrTk=; b=P75muh1hp6ckbhk1EHc/GVCasP2OBqAB1JQbau+wupsZZpmwUFLQckVL qofDCCViSlA7VgF5IxXQHFViEs7/2HTDRLL+yKsP4eBz5zvUM18DeU4QM LDzZKwxxV5jhGNSdQhUrMhFfH8s89x/axBA1SNNLM08pqWOhv6gQuEJxz dj2EOK6JtL/HeL8qlXtnS4nqlbpJiyjgYjJok1OWbZYmJriAkzjyibiVD 8+7t9yD34MCYtrqIS81nRvFz7XaewCkTknNlB7p46rfUk47rKIrp6r3Mp FXxtkU5y7nzVnLYhVSJC87Cnqk9RSW7GBGjoI0uIQyG3r80LUkwPUsy/H A==; X-CSE-ConnectionGUID: TQiLXuLyQtK4pS5MWAAhiQ== X-CSE-MsgGUID: l9/K1A6TRVGYYDYnlpGQrg== X-IronPort-AV: E=McAfee;i="6800,10657,11726"; a="74381620" X-IronPort-AV: E=Sophos;i="6.23,113,1770624000"; d="scan'208";a="74381620" Received: from orviesa003.jf.intel.com ([10.64.159.143]) by fmvoesa108.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Mar 2026 06:24:10 -0700 X-CSE-ConnectionGUID: ZNge3v/KRV+16r+nDY4xrQ== X-CSE-MsgGUID: hgLOv9dhS+uWUfuQGD5NGg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,113,1770624000"; d="scan'208";a="224622625" Received: from black.igk.intel.com ([10.91.253.5]) by orviesa003.jf.intel.com with ESMTP; 11 Mar 2026 06:24:08 -0700 Received: by black.igk.intel.com (Postfix, from userid 1008) id 4EE4795; Wed, 11 Mar 2026 14:24:07 +0100 (CET) Date: Wed, 11 Mar 2026 15:23:26 +0200 From: Heikki Krogerus To: Elson Serrao Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Dmitry Baryshkov , Konrad Dybcio , Wesley Cheng , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC PATCH 0/1] =?utf-8?Q?dt-bindings?= =?utf-8?Q?=3A_connector=3A_Add_role=E2=80=91switch?= provider phandle Message-ID: References: <20260223191042.825136-1-elson.serrao@oss.qualcomm.com> <1c790a52-3d84-46b8-aa14-1d005671e416@oss.qualcomm.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Mon, Mar 09, 2026 at 01:41:20PM -0700, Elson Serrao kirjoitti: > > > On 2/24/2026 10:56 AM, Elson Serrao wrote: > > +Heikki Krogerus > > > > Adding Heikki since this relates to usb-role-switch provider modeling. > > > > Thanks, > > Elson > > > > On 2/23/2026 11:10 AM, Elson Serrao wrote: > >> Hi all, > >> > >> This RFC proposes a generic Devicetree mechanism for a USB connector to > >> reference the USB role‑switch provider when there is an intermediate, > >> block between the connector and the controller in the OF graph. > >> > >> Problem > >> ======= > >> OF‑graph links are strictly point‑to‑point via remote-endpoint, so a > >> consumer can only discover its immediate neighbor in the graph. When an > >> intermediate node sits between the USB connector and the controller, the > >> connector cannot identify the controller (the role‑switch provider) from > >> the graph alone. > >> > > [...] > > Gentle ping on this RFC. > > When you have a moment, I’d appreciate guidance on whether the proposed > modeling direction looks acceptable. > > For context only, the following DTS patch illustrates this modeling: > https://lore.kernel.org/all/20260309203337.803986-11-elson.serrao@oss.qualcomm.com/ FWIW you proposal is okay by me. thanks, -- heikki