From patchwork Fri Apr 1 15:49:14 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shannon Zhao X-Patchwork-Id: 64878 Delivered-To: patch@linaro.org Received: by 10.112.199.169 with SMTP id jl9csp811778lbc; Fri, 1 Apr 2016 08:52:20 -0700 (PDT) X-Received: by 10.66.141.103 with SMTP id rn7mr31819892pab.70.1459525934636; Fri, 01 Apr 2016 08:52:14 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id qk3si6636708pac.28.2016.04.01.08.52.14; Fri, 01 Apr 2016 08:52:14 -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; dkim=pass header.i=@linaro.org; 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; dmarc=pass (p=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932697AbcDAPv5 (ORCPT + 29 others); Fri, 1 Apr 2016 11:51:57 -0400 Received: from mail-pa0-f50.google.com ([209.85.220.50]:35996 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932674AbcDAPvy (ORCPT ); Fri, 1 Apr 2016 11:51:54 -0400 Received: by mail-pa0-f50.google.com with SMTP id tt10so93821735pab.3 for ; Fri, 01 Apr 2016 08:51:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=nWu3d7Z+tgU1lAkPI0s6CyZU8I/HU4cYHm2enmJu4n8=; b=b0LgwpHhjKEfaAizl5oukCJbpgwpVFIV0rrphVsfJTIgbk759PMcA0LCoJX0T0E+XB BPJTrZz0S4KgqN7LTeKp3qBVQEG8Wy7tTS5S5HHsj4wz7Kw/Ixwu8DLe/uzUg/qjN5wB OtPJNW/MhElYGyPwM6VwbikP6KU2bWM+Hc/Sg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=nWu3d7Z+tgU1lAkPI0s6CyZU8I/HU4cYHm2enmJu4n8=; b=UuaYYyk0OoaM9BbMSvjtmBjr905QpgiNTbxRCqU3fpopCEc/AhdkAxuerj9L43a21m cKd9/q38BRyzQKpd5u+05wITlhsWvcsKzUiFK/b+PoEjoTXjCvkOKtreWe4HHSjfXEma Mzsn15UXixDyzUAA9q6cpixkHQ080XDt2LRP+XAEsQ9JGbsAvef1LELgkD86mz2UV65+ pCOFCZsUm9oQCPkO/qSCi3z6cQ4VRb2eror3jd/0Q+MBMVVGIdN2+CLEUn5qwscHUxdN YBajswjw+B0XeC11vH4pTTiDI+dmwHl3BnYpeUBm9ffBHSHoVcsaD4JfLU5DR1NyHbuH GElQ== X-Gm-Message-State: AD7BkJJjQfZ6ovbUhr9xsByTcvyz+xdTB8yYBE/Rs1daiwvVwSTmv8joVl0mNhaB716pIQUI X-Received: by 10.66.55.70 with SMTP id q6mr31375201pap.126.1459525913046; Fri, 01 Apr 2016 08:51:53 -0700 (PDT) Received: from localhost.localdomain ([167.160.116.218]) by smtp.gmail.com with ESMTPSA id yj1sm22536791pac.16.2016.04.01.08.51.44 (version=TLSv1/SSLv3 cipher=OTHER); Fri, 01 Apr 2016 08:51:51 -0700 (PDT) From: Shannon Zhao To: linux-arm-kernel@lists.infradead.org, stefano.stabellini@citrix.com Cc: david.vrabel@citrix.com, devicetree@vger.kernel.org, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, julien.grall@arm.com, peter.huangpeng@huawei.com, xen-devel@lists.xen.org, zhaoshenglong@huawei.com, shannon.zhao@linaro.org, Rob Herring Subject: [PATCH v10 16/17] FDT: Add a helper to get the subnode by given name Date: Fri, 1 Apr 2016 23:49:14 +0800 Message-Id: <1459525755-36968-17-git-send-email-shannon.zhao@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1459525755-36968-1-git-send-email-shannon.zhao@linaro.org> References: <1459525755-36968-1-git-send-email-shannon.zhao@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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(+) -- 2.1.4 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);