From patchwork Tue Oct 9 10:17:24 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Silesh C V X-Patchwork-Id: 981114 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=mvista.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=mvista-com.20150623.gappssmtp.com header.i=@mvista-com.20150623.gappssmtp.com header.b="kqqN+8V5"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 42TtV64H3Dz9s3T for ; Tue, 9 Oct 2018 21:18:22 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726160AbeJIRe0 (ORCPT ); Tue, 9 Oct 2018 13:34:26 -0400 Received: from mail-pf1-f196.google.com ([209.85.210.196]:43403 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726393AbeJIReZ (ORCPT ); Tue, 9 Oct 2018 13:34:25 -0400 Received: by mail-pf1-f196.google.com with SMTP id p24-v6so598023pff.10 for ; Tue, 09 Oct 2018 03:18:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mvista-com.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id; bh=I+XobssBceHNES2QCYGPphH3TI/xahn3VphKv1PaJ08=; b=kqqN+8V5DmD2G67Qmj/ItzHVG5l/lMtKvreNGNnhVmjNFMrH/8lFPPVTZVQHumLAle yiyB4rLkx1ZFnkw4xmCYB2xSWWBQ+6VEbUmarj0CY1gkHPgiKSlLfj24+eSKXPpucB3w YBCEa4/7ts8ETb4YzB3ik5U93Jpz4AM0D51MnJp47tV7kXigAymIvH8ZkmL8xokx8Gjq GcW8d8WSYBRqI47W6WoKAspcZsrzDq/Fj0vocE1jU9bL+uo9n1EeTRqnugID6CdH2phw VuJTWFklzW44F06kptF+tuiuom4g9wnulGGik0AOBEtUcSswNRvdFlvTOF/XXtPpX6Wr syJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=I+XobssBceHNES2QCYGPphH3TI/xahn3VphKv1PaJ08=; b=crelsAA3NqKQrH2kNvk1nxmmkq3tyd4uVOF0U46FoIa8wV4QUGIgg/9nR3t/G8KPTS F53PYPRJdic7vclHulCrc6Tx9zKR0mNTqbWIDQwlK3NrUm+di+7ste3dgBPLLOW5o7v/ zKCVZOwgdkRHyi0wQyMQv8n+Vg0rcabhNwCxRQOe7Q+92rsqF6cueTjCrPUEQfTJ335s m4XvZcF4sHZEt3qp2RafGr8gIc9Mnl9ePtkglsBs7s4VHemAzhvN0Zxd9/F3cp641oss eGatOvJWY1uAyVYCgL2GnQZjysuH++seDXfVbQr31+T520RzIyRLcvij18bX9xwWZv2+ Ff1A== X-Gm-Message-State: ABuFfogkB9MB6gRiDY3HJSNxaXSWBrEem6Eor2ayIir6ZMgkb30sTYqM xQa80fARFPJex7YE9cksaOhoZg== X-Google-Smtp-Source: ACcGV63Ukdhiqw99pzLpMjNdhRt6pVH4F3QBYuG446+Z66ZuYOBSZwdkDWMW+uEblZC6esUrxjcveQ== X-Received: by 2002:a62:20d8:: with SMTP id m85-v6mr29277521pfj.152.1539080292835; Tue, 09 Oct 2018 03:18:12 -0700 (PDT) Received: from mercury.mvista.com ([182.72.92.62]) by smtp.gmail.com with ESMTPSA id z22-v6sm20854472pgv.24.2018.10.09.03.18.05 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 09 Oct 2018 03:18:11 -0700 (PDT) From: Silesh C V To: Greg Kroah-Hartman , "Rafael J. Wysocki" Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org, linux-rdma@vger.kernel.org, netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-spi@vger.kernel.org, Mathieu Poirier , Wolfram Sang , Lijun Ou , "Wei Hu(Xavier)" , Yisen Zhuang , Salil Mehta , Srinivas Kandagatla , Andrew Lunn , Florian Fainelli , Rob Herring , Frank Rowand , Mark Brown , "David S. Miller" , Silesh C V Subject: [PATCH v3 1/2] Driver core: add bus_find_device_by_fwnode Date: Tue, 9 Oct 2018 15:47:24 +0530 Message-Id: <1539080245-25818-1-git-send-email-svellattu@mvista.com> X-Mailer: git-send-email 1.9.1 Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Some drivers need to find the device on a bus having a specific firmware node. Currently, such drivers have their own implementations to do this. Provide a helper similar to bus_find_device_by_name so that each driver does not have to reinvent this. Signed-off-by: Silesh C V Reviewed-by: Rafael J. Wysocki --- Changes since v2: - make use of dev_fwnode in match_fwnode. drivers/base/bus.c | 20 ++++++++++++++++++++ include/linux/device.h | 3 +++ 2 files changed, 23 insertions(+) diff --git a/drivers/base/bus.c b/drivers/base/bus.c index 8bfd27e..a2f39db 100644 --- a/drivers/base/bus.c +++ b/drivers/base/bus.c @@ -17,6 +17,7 @@ #include #include #include +#include #include "base.h" #include "power/power.h" @@ -373,6 +374,25 @@ struct device *bus_find_device_by_name(struct bus_type *bus, } EXPORT_SYMBOL_GPL(bus_find_device_by_name); +static int match_fwnode(struct device *dev, void *fwnode) +{ + return dev_fwnode(dev) == fwnode; +} + +/** + * bus_find_device_by_fwnode - device iterator for locating a particular device + * having a specific firmware node + * @bus: bus type + * @start: Device to begin with + * @fwnode: firmware node of the device to match + */ +struct device *bus_find_device_by_fwnode(struct bus_type *bus, struct device *start, + struct fwnode_handle *fwnode) +{ + return bus_find_device(bus, start, (void *)fwnode, match_fwnode); +} +EXPORT_SYMBOL_GPL(bus_find_device_by_fwnode); + /** * subsys_find_device_by_id - find a device with a specific enumeration number * @subsys: subsystem diff --git a/include/linux/device.h b/include/linux/device.h index 8f88254..09384f6 100644 --- a/include/linux/device.h +++ b/include/linux/device.h @@ -171,6 +171,9 @@ struct device *bus_find_device(struct bus_type *bus, struct device *start, struct device *bus_find_device_by_name(struct bus_type *bus, struct device *start, const char *name); +struct device *bus_find_device_by_fwnode(struct bus_type *bus, + struct device *start, + struct fwnode_handle *fwnode); struct device *subsys_find_device_by_id(struct bus_type *bus, unsigned int id, struct device *hint); int bus_for_each_drv(struct bus_type *bus, struct device_driver *start,