From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752889AbbGaJoN (ORCPT ); Fri, 31 Jul 2015 05:44:13 -0400 Received: from down.free-electrons.com ([37.187.137.238]:33743 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751888AbbGaJkS (ORCPT ); Fri, 31 Jul 2015 05:40:18 -0400 From: Alexandre Belloni To: Nicolas Ferre Cc: Boris Brezillon , Maxime Ripard , Jean-Christophe Plagniol-Villard , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Alexandre Belloni , Sebastian Reichel , Dmitry Eremin-Solenikov , linux-pm@vger.kernel.org Subject: [PATCH 19/23] power/reset: at91-poweroff: get and use slow clock Date: Fri, 31 Jul 2015 11:39:55 +0200 Message-Id: <1438335599-3301-20-git-send-email-alexandre.belloni@free-electrons.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1438335599-3301-1-git-send-email-alexandre.belloni@free-electrons.com> References: <1438335599-3301-1-git-send-email-alexandre.belloni@free-electrons.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit dca1a4b5ff6e ("clk: at91: keep slow clk enabled to prevent system hang") added a workaround for the slow clock as it is not properly handled by its users. Get and use the slow clock as it is necessary for the at91 shutdown controller. Signed-off-by: Alexandre Belloni --- Cc: Sebastian Reichel Cc: Dmitry Eremin-Solenikov Cc: linux-pm@vger.kernel.org drivers/power/reset/at91-poweroff.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c index 9847cfb7e23d..fadd1a41729b 100644 --- a/drivers/power/reset/at91-poweroff.c +++ b/drivers/power/reset/at91-poweroff.c @@ -10,6 +10,7 @@ * warranty of any kind, whether express or implied. */ +#include #include #include #include @@ -48,6 +49,7 @@ static const char *shdwc_wakeup_modes[] = { }; static void __iomem *at91_shdwc_base; +static struct clk *sclk; static void __init at91_wakeup_status(void) { @@ -122,6 +124,7 @@ static void at91_poweroff_dt_set_wakeup_mode(struct platform_device *pdev) static int at91_poweroff_probe(struct platform_device *pdev) { struct resource *res; + int ret; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); at91_shdwc_base = devm_ioremap_resource(&pdev->dev, res); @@ -130,6 +133,16 @@ static int at91_poweroff_probe(struct platform_device *pdev) return PTR_ERR(at91_shdwc_base); } + sclk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(sclk)) + return PTR_ERR(sclk); + + ret = clk_prepare_enable(sclk); + if (ret) { + dev_err(&pdev->dev, "Could not enable slow clock\n"); + return ret; + } + at91_wakeup_status(); if (pdev->dev.of_node) -- 2.1.4