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: 61227 Delivered-To: patch@linaro.org Received: by 10.112.43.199 with SMTP id y7csp837255lbl; Thu, 4 Feb 2016 19:08:11 -0800 (PST) X-Received: by 10.98.67.14 with SMTP id q14mr16487115pfa.137.1454641691145; Thu, 04 Feb 2016 19:08:11 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id rm10si20709909pab.25.2016.02.04.19.08.10; Thu, 04 Feb 2016 19:08:11 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752271AbcBEDII (ORCPT + 30 others); Thu, 4 Feb 2016 22:08:08 -0500 Received: from szxga02-in.huawei.com ([119.145.14.65]:14006 "EHLO szxga02-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752110AbcBEDHj (ORCPT ); Thu, 4 Feb 2016 22:07:39 -0500 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: , , , CC: , , , , , , , , , , , Rob Herring Subject: [PATCH v4 16/17] FDT: Add a helper to get specified name subnode 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 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- CC: Rob Herring --- drivers/of/fdt.c | 25 +++++++++++++++++++++++++ include/linux/of_fdt.h | 2 ++ 2 files changed, 27 insertions(+) -- 2.0.4 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);