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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B2BB2F8D779 for ; Thu, 16 Apr 2026 20:39:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:References: List-Owner; bh=273J6d2bJPziOOvJNbT/yeQhqND2lcrjyhTAhjAjRTA=; b=44MzrnavSNDtjn iRirZqrmBccWB/p5/Hk+tKXeZVzX63uy0Sa6vsWNaqBGQ7A0jBHkSEIK2wiijwh/551iJdnt6GDbT 9XW7WFhIBiC7/TdiBBJCX0T2DmcCb+Ge6+mS8Jty24C/4loBY5sfj1wtszo8u7NX+uysHNm2qX/FB pzmUZoDMlYJdFxunodW1Cnwo5TXqduk7XxOK1Pk96QB6aOW4in/eYnFAz57URaEkb4imPNCI2Is5m BngzA75w56qiZYOeKa8ggM9oAr9NuuTGHLq/whSBV4X6LoEZuhPqaD5Q6DFNLuznktOO1lMF+POAe 6Wsv1YZ2kguVxu3zpnEA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wDTUU-000000030RL-0SVm; Thu, 16 Apr 2026 20:39:10 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wDTUS-000000030Qm-1KBp for linux-arm-kernel@lists.infradead.org; Thu, 16 Apr 2026 20:39:09 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 15969401B0; Thu, 16 Apr 2026 20:39:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBC9FC2BCAF; Thu, 16 Apr 2026 20:39:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776371946; bh=RhBffrmsMOEQ9U00Vb6PjZXRgwm+dO9ZID94mEWA0Ak=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=NIC+uZOPOTFu7mybYkK3oTnc3bdL2r8txodTtcrLDkhApF+K+rfsBdgJQ6aSWThkY JqpOvSaL0mArNGzN2M0iMSmFbee7mQNnEvqfAqWTLv6U1KEfdTbwejpFRsj+fVtIsb wSB1W7m+2Y7VxZfP8etFbgvKsjrTIkLkEtJ5SYXL4uJdRKyzpjQ/ujP14rk/WfLYuM fBLieuO+kfgLbJeeCbzU2S7ImUhAdGLeQU5oXRt9tS31b98FJutEdKNSmOLoQdXJtR 5Yq1GPtrt6yU21YRfIkHj1q/eLrGVHyqMdgbL0cy86aAHatdAKBahoPgjxliq8Dlw2 my5ITqYYZj0BQ== Date: Thu, 16 Apr 2026 15:39:05 -0500 From: Bjorn Helgaas To: Sherry Sun Cc: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, Frank.Li@nxp.com, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, lpieralisi@kernel.org, kwilczynski@kernel.org, mani@kernel.org, bhelgaas@google.com, hongxing.zhu@nxp.com, l.stach@pengutronix.de, imx@lists.linux.dev, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH V13 02/12] PCI: host-generic: Add common helpers for parsing Root Port properties Message-ID: <20260416203905.GA29913@bhelgaas> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260416111422.183860-3-sherry.sun@nxp.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260416_133908_399687_0457DB8B X-CRM114-Status: UNSURE ( 8.67 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Apr 16, 2026 at 07:14:12PM +0800, Sherry Sun wrote: > Introduce generic helper functions to parse Root Port device tree nodes > and extract common properties like reset GPIOs. This allows multiple > PCI host controller drivers to share the same parsing logic. > > Define struct pci_host_port to hold common Root Port properties > (currently only reset GPIO descriptor) and add > pci_host_common_parse_ports() to parse Root Port nodes from device tree. Are the Root Port and the RC the only possible places for 'reset' GPIO descriptions in DT? I think PERST# routing is outside the PCIe spec, so it seems like a system could provide a PERST# GPIO routed to any Switch Upstream Port or Endpoint (I assume a PERST# connected to a switch would apply to both the upstream port and the downstream ports).