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: 65304 Delivered-To: patch@linaro.org Received: by 10.112.43.237 with SMTP id z13csp34330lbl; Thu, 7 Apr 2016 05:06:26 -0700 (PDT) X-Received: by 10.66.55.70 with SMTP id q6mr4230715pap.126.1460030786512; Thu, 07 Apr 2016 05:06:26 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id pz7si535686pab.216.2016.04.07.05.06.26; Thu, 07 Apr 2016 05:06:26 -0700 (PDT) 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 S1756246AbcDGMGX (ORCPT + 29 others); Thu, 7 Apr 2016 08:06:23 -0400 Received: from szxga03-in.huawei.com ([119.145.14.66]:28972 "EHLO szxga03-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756113AbcDGMEb (ORCPT ); Thu, 7 Apr 2016 08:04:31 -0400 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: , CC: , , , , , , , , , , Rob Herring Subject: [PATCH v11 16/17] FDT: Add a helper to get the subnode by given name 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 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 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(+) -- 2.0.4 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);