From patchwork Thu Apr 7 12:03:33 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shannon Zhao X-Patchwork-Id: 8772111 Return-Path: X-Original-To: patchwork-xen-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 665D19F39A for ; Thu, 7 Apr 2016 12:13:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8D0352025A for ; Thu, 7 Apr 2016 12:13:57 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 523A62024F for ; Thu, 7 Apr 2016 12:13:56 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ao8nE-0004uW-4t; Thu, 07 Apr 2016 12:12:12 +0000 Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xenproject.org with esmtp (Exim 4.84_2) (envelope-from ) id 1ao8nC-0004u4-BR for xen-devel@lists.xen.org; Thu, 07 Apr 2016 12:12:10 +0000 Received: from [85.158.139.211] by server-5.bemta-5.messagelabs.com id 43/33-03597-99E46075; Thu, 07 Apr 2016 12:12:09 +0000 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrGIsWRWlGSWpSXmKPExsVSPpHPSXemH1u 4wZ1/3BZLPi5mcWD0OLr7N1MAYxRrZl5SfkUCa8aaJ+8ZC/7wVqy+vpOtgfEBdxcjF4eQwBlG iTPX9zB2MXICObsZJe5O0QGx2QR0JT5unMLexcjBISLgInHssxdIPbPAVSaJWU0trCA1wgK+E mv/3wSzWQRUJO4e2M8CYvMKeEpcmLSRCcSWENCQWNk7ASzOCRRva5/ICrHLQ2JHyzwmiHpBiZ Mzn4DVMAtISBx88YIZoldRom39STYIW1Li4IobLCBHSAicYpRYv30rC0TCVOJL22XmCYyCs5D MmoVk1gJGplWM6sWpRWWpRboWeklFmekZJbmJmTm6hgamermpxcWJ6ak5iUnFesn5uZsYgeHJ AAQ7GA82Ox9ilORgUhLlne7KFi7El5SfUpmRWJwRX1Sak1p8iFGGg0NJgtfZFygnWJSanlqRl pkDjBSYtAQHj5II714foDRvcUFibnFmOkTqFKOilDjvJ5CEAEgiozQPrg0WnZcYZaWEeRmBDh HiKUgtys0sQZV/xSjOwagkDLGdJzOvBG76K6DFTECLL/CDLS5JREhJNTDu9Zl89PyBRR2mZ86 rKWnwnFm0voG3jN/p34K0ewxVwq7p2yWO/s5uWPiYt3XOrYM217kkVI4eWpziNjdq9RJGPSu2 514b0yKcO3fZHruR9Ws+zwN/9hM3rXqXTX/6i+2db+4B6aOvFK23lE3Yw7eY4XVBh+DjnvIbi 2SPb85IZGV83PxH0TtHiaU4I9FQi7moOBEAzvf0Q8kCAAA= X-Env-Sender: zhaoshenglong@huawei.com X-Msg-Ref: server-16.tower-206.messagelabs.com!1460031122!19036391!1 X-Originating-IP: [119.145.14.66] X-SpamReason: No, hits=0.0 required=7.0 tests=sa_preprocessor: VHJ1c3RlZCBJUDogMTE5LjE0NS4xNC42NiA9PiA4NTI3\n X-StarScan-Received: X-StarScan-Version: 8.28; banners=-,-,- X-VirusChecked: Checked Received: (qmail 44327 invoked from network); 7 Apr 2016 12:12:08 -0000 Received: from szxga03-in.huawei.com (HELO szxga03-in.huawei.com) (119.145.14.66) by server-16.tower-206.messagelabs.com with RC4-SHA encrypted SMTP; 7 Apr 2016 12:12:08 -0000 Received: from 172.24.1.137 (EHLO SZXEML424-HUB.china.huawei.com) ([172.24.1.137]) by szxrg03-dlp.huawei.com (MOS 4.4.3-GA FastPath queued) with ESMTP id BZL25453; Thu, 07 Apr 2016 20:04:28 +0800 (CST) Received: from HGHY1Z002260041.china.huawei.com (10.177.16.142) by SZXEML424-HUB.china.huawei.com (10.82.67.153) with Microsoft SMTP Server id 14.3.235.1; Thu, 7 Apr 2016 20:04:20 +0800 From: Shannon Zhao To: , Date: Thu, 7 Apr 2016 20:03:33 +0800 Message-ID: <1460030614-16112-17-git-send-email-zhaoshenglong@huawei.com> X-Mailer: git-send-email 1.9.0.msysgit.0 In-Reply-To: <1460030614-16112-1-git-send-email-zhaoshenglong@huawei.com> References: <1460030614-16112-1-git-send-email-zhaoshenglong@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.177.16.142] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A090202.57064CCC.00D4, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-05-26 15:14:31, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: dfe0eb2a20243d19639b306db96faeff Cc: devicetree@vger.kernel.org, linux-efi@vger.kernel.org, Rob Herring , catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, xen-devel@lists.xen.org, julien.grall@arm.com, david.vrabel@citrix.com, peter.huangpeng@huawei.com, shannon.zhao@linaro.org Subject: [Xen-devel] [PATCH v11 16/17] FDT: Add a helper to get the subnode by given name X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xen.org Sender: "Xen-devel" X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Shannon Zhao Sometimes it needs to check if there is a subnode of given node in FDT by given name. Introduce this helper to get the subnode if it exists. CC: Rob Herring Signed-off-by: Shannon Zhao Acked-by: Stefano Stabellini Acked-by: Rob Herring --- drivers/of/fdt.c | 13 +++++++++++++ include/linux/of_fdt.h | 2 ++ 2 files changed, 15 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 3349d2a..5c8b2f2 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -645,6 +645,19 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node, } /** + * of_get_flat_dt_subnode_by_name - get the subnode by given name + * + * @node: the parent node + * @uname: the name of subnode + * @return offset of the subnode, or -FDT_ERR_NOTFOUND if there is none + */ + +int of_get_flat_dt_subnode_by_name(unsigned long node, const char *uname) +{ + return fdt_subnode_offset(initial_boot_params, node, uname); +} + +/** * of_get_flat_dt_root - find the root node in the flat blob */ unsigned long __init of_get_flat_dt_root(void) diff --git a/include/linux/of_fdt.h b/include/linux/of_fdt.h index 2fbe868..2c3707e 100644 --- a/include/linux/of_fdt.h +++ b/include/linux/of_fdt.h @@ -52,6 +52,8 @@ extern char __dtb_end[]; extern int of_scan_flat_dt(int (*it)(unsigned long node, const char *uname, int depth, void *data), void *data); +extern int of_get_flat_dt_subnode_by_name(unsigned long node, + const char *uname); extern const void *of_get_flat_dt_prop(unsigned long node, const char *name, int *size); extern int of_flat_dt_is_compatible(unsigned long node, const char *name);