Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756381AbdDRLVs (ORCPT ); Tue, 18 Apr 2017 07:21:48 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:49400 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754489AbdDRLVn (ORCPT ); Tue, 18 Apr 2017 07:21:43 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 8A68360DF8 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=vivek.gautam@codeaurora.org From: Vivek Gautam To: p.zabel@pengutronix.de, swarren@wwwdotorg.org, balbi@kernel.org Cc: linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org, linux-usb@vger.kernel.org, thierry.reding@gmail.com, gregkh@linuxfoundation.org, linux-arm-msm@vger.kernel.org, Vivek Gautam Subject: [PATCH V3 1/4] reset: Add API to count number of reset available with device Date: Tue, 18 Apr 2017 16:51:25 +0530 Message-Id: <1492514488-27385-2-git-send-email-vivek.gautam@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1492514488-27385-1-git-send-email-vivek.gautam@codeaurora.org> References: <1492514488-27385-1-git-send-email-vivek.gautam@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1968 Lines: 68 Count number of reset phandles available with the device node to know the resets a given device has. Cc: Philipp Zabel Signed-off-by: Vivek Gautam --- drivers/reset/core.c | 23 +++++++++++++++++++++++ include/linux/reset.h | 6 ++++++ 2 files changed, 29 insertions(+) diff --git a/drivers/reset/core.c b/drivers/reset/core.c index cd739d2fa160..f0a06a7aca93 100644 --- a/drivers/reset/core.c +++ b/drivers/reset/core.c @@ -465,3 +465,26 @@ int device_reset(struct device *dev) return ret; } EXPORT_SYMBOL_GPL(device_reset); + +/** + * of_reset_control_get_count - Count number of resets available with a device + * + * @node: device node that contains 'resets'. + * + * Returns positive reset count on success, or error number on failure and + * on count being zero. + */ +int of_reset_control_get_count(struct device_node *node) +{ + int count; + + if (!node) + return -EINVAL; + + count = of_count_phandle_with_args(node, "resets", "#reset-cells"); + if (count == 0) + count = -ENOENT; + + return count; +} +EXPORT_SYMBOL_GPL(of_reset_control_get_count); diff --git a/include/linux/reset.h b/include/linux/reset.h index 13d8681210d5..1b5a6aafd3e6 100644 --- a/include/linux/reset.h +++ b/include/linux/reset.h @@ -24,6 +24,7 @@ struct reset_control *__devm_reset_control_get(struct device *dev, bool optional); int __must_check device_reset(struct device *dev); +int of_reset_control_get_count(struct device_node *node); static inline int device_reset_optional(struct device *dev) { @@ -89,6 +90,11 @@ static inline struct reset_control *__devm_reset_control_get( return optional ? NULL : ERR_PTR(-ENOTSUPP); } +static inline int of_reset_control_get_count(struct device_node *node) +{ + return -ENOTSUPP; +} + #endif /* CONFIG_RESET_CONTROLLER */ /** -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project