From patchwork Thu May 22 11:24:00 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lee Jones X-Patchwork-Id: 4221741 Return-Path: X-Original-To: patchwork-linux-arm@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 75BAF9F23C for ; Thu, 22 May 2014 11:27:47 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id A3392202EC for ; Thu, 22 May 2014 11:27:46 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D3AAE202E6 for ; Thu, 22 May 2014 11:27:45 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WnR7m-00053l-W1; Thu, 22 May 2014 11:25:26 +0000 Received: from mail-ie0-f182.google.com ([209.85.223.182]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WnR75-0003db-57 for linux-arm-kernel@lists.infradead.org; Thu, 22 May 2014 11:24:44 +0000 Received: by mail-ie0-f182.google.com with SMTP id as1so3389227iec.13 for ; Thu, 22 May 2014 04:24:21 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=XJj8PZ6TVY6Y8nRE965Eau89QVkj8JmbgdYut74JD2M=; b=CDZKMmMgIFItlggKSTn3OVENMLkoNXFOwjYrxxXALT248CKNK5KYnxz314Ec+IWLgl 7Sb66eyruWLHYk4Dm2BjFIlfPDVMUYSBwW1mBD1wsNBWgK+J9qWzN5yWGKUgtCuFjWEi 498NLy2cE6kowilXPx7Bg0rJo9mE+MkTwus2C4iAO0cLm/kEJbNm4+nSiI0OptsupHMM 2Rt6vlmK2NNLwQrGARVcdxdiXYN+NFA4mecTTyAk555KEV0dGaKSorQaN7W2YogQgoiW SgXj++Zy+yAXFG668ZiUzLoOgzVlCy4qtXyt0/C1qVbSZjLS/GVSslf85BtMVbJCg6Ii jvzQ== X-Gm-Message-State: ALoCoQnXdAgodgVbjrrlu0HAwaJ16Pf/ZlsnXK3PESifkMkcJGkSWlhv9aADA7EQwOzcB3AFzX0P X-Received: by 10.43.62.204 with SMTP id xb12mr53295790icb.51.1400757861750; Thu, 22 May 2014 04:24:21 -0700 (PDT) Received: from localhost.localdomain (host109-148-113-200.range109-148.btcentralplus.com. [109.148.113.200]) by mx.google.com with ESMTPSA id z4sm12643314igl.13.2014.05.22.04.24.19 for (version=TLSv1.1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 22 May 2014 04:24:21 -0700 (PDT) From: Lee Jones To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 02/10] mtd: st_spi_fsm: Obtain and use EMI clock if provided Date: Thu, 22 May 2014 12:24:00 +0100 Message-Id: <1400757848-18075-3-git-send-email-lee.jones@linaro.org> X-Mailer: git-send-email 1.8.3.2 In-Reply-To: <1400757848-18075-1-git-send-email-lee.jones@linaro.org> References: <1400757848-18075-1-git-send-email-lee.jones@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140522_042443_254625_041D66A5 X-CRM114-Status: GOOD ( 15.81 ) X-Spam-Score: -0.7 (/) Cc: Lee Jones , computersforpeace@gmail.com, linux-mtd@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable 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 ST's Common Clk Framework is now available. This patch ensures the FSM makes use of it by obtaining and enabling the EMI clock if provided. If system fails to provide the EMI clock FSM uses its original default rate. Signed-off-by: Lee Jones --- drivers/mtd/devices/st_spi_fsm.c | 45 ++++++++++++++++++++++++++++++++++++++-- 1 file changed, 43 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index aca4d72..fe54533 100644 --- a/drivers/mtd/devices/st_spi_fsm.c +++ b/drivers/mtd/devices/st_spi_fsm.c @@ -24,6 +24,7 @@ #include #include #include +#include #include "serial_flash_cmds.h" @@ -262,6 +263,7 @@ struct stfsm { struct mtd_info mtd; struct mutex lock; struct flash_info *info; + struct clk *clk; uint32_t configuration; uint32_t fifo_dir_delay; @@ -1907,8 +1909,13 @@ static void stfsm_set_freq(struct stfsm *fsm, uint32_t spi_freq) uint32_t emi_freq; uint32_t clk_div; - /* TODO: Make this dynamic */ - emi_freq = STFSM_DEFAULT_EMI_FREQ; + if (!fsm->clk) { + dev_warn(fsm->dev, + "No EMI clock available. Using default 100MHz.\n"); + + emi_freq = STFSM_DEFAULT_EMI_FREQ; + } else + emi_freq = clk_get_rate(fsm->clk); /* * Calculate clk_div - values between 2 and 128 @@ -2058,6 +2065,15 @@ static int stfsm_probe(struct platform_device *pdev) return PTR_ERR(fsm->base); } + fsm->clk = devm_clk_get(&pdev->dev, "emi_clk"); + if (IS_ERR(fsm->clk)) { + dev_warn(fsm->dev, "Couldn't find EMI clock.\n"); + fsm->clk = NULL; + } else if (clk_prepare_enable(fsm->clk)) { + dev_warn(fsm->dev, "Failed to enable EMI clock.\n"); + fsm->clk = NULL; + } + mutex_init(&fsm->lock); ret = stfsm_init(fsm); @@ -2122,6 +2138,30 @@ static int stfsm_remove(struct platform_device *pdev) return mtd_device_unregister(&fsm->mtd); } +#ifdef CONFIG_PM +static int stfsmfsm_suspend(struct device *dev) +{ + struct stfsm *fsm = dev_get_drvdata(dev); + + if (fsm->clk) + clk_disable_unprepare(fsm->clk); + + return 0; +} + +static int stfsmfsm_resume(struct device *dev) +{ + struct stfsm *fsm = dev_get_drvdata(dev); + + if (fsm->clk) + clk_prepare_enable(fsm->clk); + + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(stfsm_pm_ops, stfsmfsm_suspend, stfsmfsm_resume); + static struct of_device_id stfsm_match[] = { { .compatible = "st,spi-fsm", }, {}, @@ -2135,6 +2175,7 @@ static struct platform_driver stfsm_driver = { .name = "st-spi-fsm", .owner = THIS_MODULE, .of_match_table = stfsm_match, + .pm = &stfsm_pm_ops, }, }; module_platform_driver(stfsm_driver);