Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752551AbcCDM2E (ORCPT ); Fri, 4 Mar 2016 07:28:04 -0500 Received: from smtp02.citrix.com ([66.165.176.63]:8427 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750932AbcCDM2A (ORCPT ); Fri, 4 Mar 2016 07:28:00 -0500 X-IronPort-AV: E=Sophos;i="5.22,535,1449532800"; d="scan'208";a="343187657" Date: Fri, 4 Mar 2016 12:27:08 +0000 From: Stefano Stabellini X-X-Sender: sstabellini@kaball.uk.xensource.com To: Shannon Zhao CC: , , , , , , , , , , , , , Rob Herring Subject: Re: [PATCH v5 16/17] FDT: Add a helper to get the subnode by given name In-Reply-To: <1457073455-11516-17-git-send-email-zhaoshenglong@huawei.com> Message-ID: References: <1457073455-11516-1-git-send-email-zhaoshenglong@huawei.com> <1457073455-11516-17-git-send-email-zhaoshenglong@huawei.com> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1891 Lines: 57 On Fri, 4 Mar 2016, Shannon Zhao wrote: > 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 > 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 655f79d..09001db 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 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); > -- > 2.0.4 > >