From patchwork Tue Jul 29 16:28:55 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Javier Martinez Canillas X-Patchwork-Id: 4641331 Return-Path: X-Original-To: patchwork-linux-samsung-soc@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id E807A9F32F for ; Tue, 29 Jul 2014 16:30:55 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2CCB920149 for ; Tue, 29 Jul 2014 16:30:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 661E520145 for ; Tue, 29 Jul 2014 16:30:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751321AbaG2Qaj (ORCPT ); Tue, 29 Jul 2014 12:30:39 -0400 Received: from bhuna.collabora.co.uk ([93.93.135.160]:58421 "EHLO bhuna.collabora.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752519AbaG2Q3U (ORCPT ); Tue, 29 Jul 2014 12:29:20 -0400 Received: from [127.0.0.1] (localhost [127.0.0.1]) (Authenticated sender: javier) with ESMTPSA id 518B0602DF0 From: Javier Martinez Canillas To: Mark Brown Cc: Kukjin Kim , Doug Anderson , Olof Johansson , Yuvaraj Kumar C D , linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Javier Martinez Canillas Subject: [RFC 1/5] regulator: core: Get voltage from parent if not available Date: Tue, 29 Jul 2014 18:28:55 +0200 Message-Id: <1406651339-28901-2-git-send-email-javier.martinez@collabora.co.uk> X-Mailer: git-send-email 2.0.0.rc2 In-Reply-To: <1406651339-28901-1-git-send-email-javier.martinez@collabora.co.uk> References: <1406651339-28901-1-git-send-email-javier.martinez@collabora.co.uk> Sender: linux-samsung-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Load switches are modeled as regulators but they just provide the voltage of their parent input supply. So the drivers for these switches usually don't provide a .get_voltage function handler but there is code in the kernel that assumes that all regulators should be able to provide its current voltage rail. So, if the output voltage for a regulator is not available and it has a parent supply, then pass the voltage of its parent. Signed-off-by: Javier Martinez Canillas --- drivers/regulator/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 69c9c08..089cea8 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -2695,6 +2695,8 @@ static int _regulator_get_voltage(struct regulator_dev *rdev) ret = rdev->desc->ops->list_voltage(rdev, 0); } else if (rdev->desc->fixed_uV && (rdev->desc->n_voltages == 1)) { ret = rdev->desc->fixed_uV; + } else if (rdev->supply) { + ret = regulator_get_voltage(rdev->supply); } else { return -EINVAL; }