From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 548B6C04AB6 for ; Fri, 31 May 2019 14:16:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 34E5B26A6E for ; Fri, 31 May 2019 14:16:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726957AbfEaOQI (ORCPT ); Fri, 31 May 2019 10:16:08 -0400 Received: from mga05.intel.com ([192.55.52.43]:8345 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726601AbfEaOQI (ORCPT ); Fri, 31 May 2019 10:16:08 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 31 May 2019 07:16:08 -0700 X-ExtLoop1: 1 Received: from black.fi.intel.com (HELO black.fi.intel.com.) ([10.237.72.28]) by fmsmga001.fm.intel.com with ESMTP; 31 May 2019 07:16:06 -0700 From: Heikki Krogerus To: "Rafael J. Wysocki" Cc: Hans de Goede , Greg Kroah-Hartman , Andy Shevchenko , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org Subject: [PATCH v5 08/16] device property: Introduce fwnode_find_reference() Date: Fri, 31 May 2019 17:15:39 +0300 Message-Id: <20190531141547.22728-9-heikki.krogerus@linux.intel.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190531141547.22728-1-heikki.krogerus@linux.intel.com> References: <20190531141547.22728-1-heikki.krogerus@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org In most cases the references that the drivers look for don't have any arguments. This introduces a wrapper function for fwnode_property_get_reference_args() that looks for references by using only the name and index. Signed-off-by: Heikki Krogerus Tested-by: Hans de Goede --- drivers/base/property.c | 24 ++++++++++++++++++++++++ include/linux/property.h | 4 ++++ 2 files changed, 28 insertions(+) diff --git a/drivers/base/property.c b/drivers/base/property.c index 348b37e64944..81bd01ed4042 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -484,6 +484,30 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode, } EXPORT_SYMBOL_GPL(fwnode_property_get_reference_args); +/** + * fwnode_find_reference - Find named reference to a fwnode_handle + * @fwnode: Firmware node where to look for the reference + * @name: The name of the reference + * @index: Index of the reference + * + * @index can be used when the named reference holds a table of references. + * + * Returns pointer to the reference fwnode, or ERR_PTR. Caller is responsible to + * call fwnode_handle_put() on the returned fwnode pointer. + */ +struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode, + const char *name, + unsigned int index) +{ + struct fwnode_reference_args args; + int ret; + + ret = fwnode_property_get_reference_args(fwnode, name, NULL, 0, index, + &args); + return ret ? ERR_PTR(ret) : args.fwnode; +} +EXPORT_SYMBOL_GPL(fwnode_find_reference); + /** * device_remove_properties - Remove properties from a device object. * @dev: Device whose properties to remove. diff --git a/include/linux/property.h b/include/linux/property.h index abcde2f236a0..088d4db7e949 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -79,6 +79,10 @@ int fwnode_property_get_reference_args(const struct fwnode_handle *fwnode, unsigned int nargs, unsigned int index, struct fwnode_reference_args *args); +struct fwnode_handle *fwnode_find_reference(const struct fwnode_handle *fwnode, + const char *name, + unsigned int index); + struct fwnode_handle *fwnode_get_parent(const struct fwnode_handle *fwnode); struct fwnode_handle *fwnode_get_next_parent( struct fwnode_handle *fwnode); -- 2.20.1