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: 8726391 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id DE3EDC0553 for ; Fri, 1 Apr 2016 16:01:05 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 10CB7201FA for ; Fri, 1 Apr 2016 16:01:02 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 92C5C20155 for ; Fri, 1 Apr 2016 16:00:56 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1am1Tc-0004Df-VW; Fri, 01 Apr 2016 15:59:13 +0000 Received: from mail-pa0-x22f.google.com ([2607:f8b0:400e:c03::22f]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1am1Ms-0004FE-An for linux-arm-kernel@lists.infradead.org; Fri, 01 Apr 2016 15:52:26 +0000 Received: by mail-pa0-x22f.google.com with SMTP id tt10so93821738pab.3 for ; Fri, 01 Apr 2016 08:51:54 -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=fY8WW4q1VW8Qm0Xoa9xlFEKUxdIojXf7UqrSORMimcPU6KzkCOYpPCy2lPDrzGlYzP DOQ0X+w5rQ/3a7WI5jHCRSYP27T9P8cAw4RoZU/RACgjtP4sG8gQo0MJNhGXTaNGjIS/ cdrCGJWmcgFhqXcPgG2FMheY4BiMOrO0l6JN4dk/Ahte8DCgUKAolNPRMPweWYx4obC9 ef0mW4oOQbINpGeSnkejq+/dczT8D8K9qEFYBJHeYE/0W+AUn9SPeft9dgoPrfAb1v/b EcbyG2zecaIZjz96kHRY/tKtATApqzrlNDSWFbDuVo9X0TZd5e4uFTJM15IrozDxGe9I XuGQ== X-Gm-Message-State: AD7BkJL43i7pINMCrirCzH+jVSu04LuZEVW2ofncw6Wlo/Z+1QcfUkMw6CyKFd23+4B9v+sf 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 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> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160401_085215_251819_CC5DFFB5 X-CRM114-Status: GOOD ( 11.95 ) X-Spam-Score: -2.7 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, linux-efi@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, peter.huangpeng@huawei.com, julien.grall@arm.com, david.vrabel@citrix.com, zhaoshenglong@huawei.com, xen-devel@lists.xen.org, shannon.zhao@linaro.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-5.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_MED,RP_MATCHES_RCVD,T_DKIM_INVALID,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 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);