From patchwork Fri Feb 5 03:05:51 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shannon Zhao X-Patchwork-Id: 8230981 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 678FC9FB33 for ; Fri, 5 Feb 2016 03:15:41 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 99CBA20357 for ; Fri, 5 Feb 2016 03:15:40 +0000 (UTC) Received: from lists.xen.org (lists.xenproject.org [50.57.142.19]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AC56020306 for ; Fri, 5 Feb 2016 03:15:39 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=lists.xen.org) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1aRWqJ-0006XQ-TR; Fri, 05 Feb 2016 03:13:55 +0000 Received: from mail6.bemta5.messagelabs.com ([195.245.231.135]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1aRWqI-0006X5-1J for xen-devel@lists.xen.org; Fri, 05 Feb 2016 03:13:54 +0000 Received: from [85.158.139.211] by server-7.bemta-5.messagelabs.com id 6A/6E-29293-17314B65; Fri, 05 Feb 2016 03:13:53 +0000 X-Env-Sender: zhaoshenglong@huawei.com X-Msg-Ref: server-15.tower-206.messagelabs.com!1454642029!12054559!1 X-Originating-IP: [119.145.14.65] X-SpamReason: No, hits=0.0 required=7.0 tests=sa_preprocessor: VHJ1c3RlZCBJUDogMTE5LjE0NS4xNC42NSA9PiA3NzQ2Mw==\n X-StarScan-Received: X-StarScan-Version: 7.35.1; banners=-,-,- X-VirusChecked: Checked Received: (qmail 6154 invoked from network); 5 Feb 2016 03:13:51 -0000 Received: from szxga02-in.huawei.com (HELO szxga02-in.huawei.com) (119.145.14.65) by server-15.tower-206.messagelabs.com with SMTP; 5 Feb 2016 03:13:51 -0000 Received: from 172.24.1.49 (EHLO SZXEML424-HUB.china.huawei.com) ([172.24.1.49]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id DAZ07591; Fri, 05 Feb 2016 11:07:33 +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; Fri, 5 Feb 2016 11:07:24 +0800 From: Shannon Zhao To: , , , Date: Fri, 5 Feb 2016 11:05:51 +0800 Message-ID: <1454641552-12576-17-git-send-email-zhaoshenglong@huawei.com> X-Mailer: git-send-email 1.9.0.msysgit.0 In-Reply-To: <1454641552-12576-1-git-send-email-zhaoshenglong@huawei.com> References: <1454641552-12576-1-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=0001.0A020203.56B411F6.00BE, ss=1, re=0.000, recu=0.000, reip=0.000, cl=1, cld=1, fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: c28eed0712dd3d6e6553037e42b66548 Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, linux-efi@vger.kernel.org, ian.campbell@citrix.com, Rob Herring , catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, xen-devel@lists.xen.org, julien.grall@citrix.com, shannon.zhao@linaro.org, peter.huangpeng@huawei.com Subject: [Xen-devel] [PATCH v4 16/17] FDT: Add a helper to get specified name subnode X-BeenThere: xen-devel@lists.xen.org X-Mailman-Version: 2.1.13 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org 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 node in FDT by full path. Introduce this helper to get the specified name subnode if it exists. Signed-off-by: Shannon Zhao Reviewed-by: Stefano Stabellini --- CC: Rob Herring --- drivers/of/fdt.c | 25 +++++++++++++++++++++++++ include/linux/of_fdt.h | 2 ++ 2 files changed, 27 insertions(+) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index 655f79d..eacb188 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -645,6 +645,31 @@ int __init of_scan_flat_dt(int (*it)(unsigned long node, } /** + * of_get_flat_dt_subnode_by_name - get subnode of specified node by 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) +{ + const void *blob = initial_boot_params; + int offset; + const char *pathp; + + for (offset = fdt_first_subnode(blob, node); + offset >= 0; + offset = fdt_next_subnode(blob, offset)) { + pathp = fdt_get_name(blob, offset, NULL); + if (strcmp(pathp, uname) == 0) + return offset; + } + + return -FDT_ERR_NOTFOUND; +} + +/** * 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 df9ef38..fc28162 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);