From patchwork Fri Mar 8 15:19:05 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Petazzoni X-Patchwork-Id: 2238601 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: X-Original-To: patchwork-linux-pci@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 8D38E4006E for ; Fri, 8 Mar 2013 15:19:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758058Ab3CHPTf (ORCPT ); Fri, 8 Mar 2013 10:19:35 -0500 Received: from mail.free-electrons.com ([94.23.35.102]:35881 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757836Ab3CHPTe (ORCPT ); Fri, 8 Mar 2013 10:19:34 -0500 Received: by mail.free-electrons.com (Postfix, from userid 106) id 4F8A71130; Fri, 8 Mar 2013 16:19:36 +0100 (CET) X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT, URIBL_BLOCKED shortcircuit=ham autolearn=disabled version=3.3.2 Received: from localhost (col31-4-88-188-83-94.fbx.proxad.net [88.188.83.94]) by mail.free-electrons.com (Postfix) with ESMTPSA id CFA437FF; Fri, 8 Mar 2013 16:19:35 +0100 (CET) From: Thomas Petazzoni To: Bjorn Helgaas , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Arnd Bergmann , Jason Cooper , Andrew Lunn , Olof Johansson , Gregory Clement , Ezequiel Garcia , Russell King , Tawfik Bayouk , Shadi Ammouri , Eran Ben-Avi , Yehuda Yitschak , Nadav Haklai , Lior Amsalem , Maen Suleiman , Jason Gunthorpe , Thierry Reding , Stephen Warren Subject: [PATCH v4 03/18] of/pci: Add of_pci_get_bus() function Date: Fri, 8 Mar 2013 16:19:05 +0100 Message-Id: <1362755960-30791-4-git-send-email-thomas.petazzoni@free-electrons.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1362755960-30791-1-git-send-email-thomas.petazzoni@free-electrons.com> References: <1362755960-30791-1-git-send-email-thomas.petazzoni@free-electrons.com> Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org From: Thierry Reding This function can be used to parse the number of a device's parent PCI bus from a standard 5-cell PCI resource. Signed-off-by: Thierry Reding --- drivers/of/of_pci.c | 21 +++++++++++++++++++++ include/linux/of_pci.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c index 4dd7b9b..d6e6de5 100644 --- a/drivers/of/of_pci.c +++ b/drivers/of/of_pci.c @@ -43,6 +43,27 @@ struct device_node *of_pci_find_child_device(struct device_node *parent, EXPORT_SYMBOL_GPL(of_pci_find_child_device); /** + * of_pci_get_bus() - Get bus number for a device node + * @np: device node + * + * Parses a standard 5-cell PCI resource and returns the 8-bit bus number of + * the device's parent PCI bus. On error a negative error code is returned. + */ +int of_pci_get_bus(struct device_node *np) +{ + unsigned int size; + const __be32 *reg; + + reg = of_get_property(np, "reg", &size); + + if (!reg || size < 5 * sizeof(__be32)) + return -EINVAL; + + return (be32_to_cpup(reg) >> 16) & 0xff; +} +EXPORT_SYMBOL_GPL(of_pci_get_bus); + +/** * of_pci_get_devfn() - Get device and function numbers for a device node * @np: device node * diff --git a/include/linux/of_pci.h b/include/linux/of_pci.h index 91ec484..9118321 100644 --- a/include/linux/of_pci.h +++ b/include/linux/of_pci.h @@ -10,6 +10,7 @@ int of_irq_map_pci(const struct pci_dev *pdev, struct of_irq *out_irq); struct device_node; struct device_node *of_pci_find_child_device(struct device_node *parent, unsigned int devfn); +int of_pci_get_bus(struct device_node *np); int of_pci_get_devfn(struct device_node *np); #endif