Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932695AbcDAPv5 (ORCPT ); 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 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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1740 Lines: 51 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); -- 2.1.4