Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751853AbdIUMpY (ORCPT ); Thu, 21 Sep 2017 08:45:24 -0400 Received: from mailgw01.mediatek.com ([218.249.47.110]:33678 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751605AbdIUMpT (ORCPT ); Thu, 21 Sep 2017 08:45:19 -0400 X-UUID: a3fc25712a5e4aa0abdb0f12973f27b6-20170921 From: Guochun Mao To: Cyrille Pitchen , Matthias Brugger , Rob Herring , Boris Brezillon CC: Brian Norris , Marek Vasut , David Woodhouse , Richard Weinberger , Mark Rutland , , , , , , Guochun Mao Subject: [PATCH v1 2/2] mtd: mtk-nor: add suspend/resume support Date: Thu, 21 Sep 2017 20:45:06 +0800 Message-ID: <1505997906-30921-3-git-send-email-guochun.mao@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1505997906-30921-1-git-send-email-guochun.mao@mediatek.com> References: <1505997906-30921-1-git-send-email-guochun.mao@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3272 Lines: 126 Abstract functions of clock setting, to avoid duplicated code, these functions been used in new feature. Implement suspend/resume functions. Signed-off-by: Guochun Mao --- drivers/mtd/spi-nor/mtk-quadspi.c | 70 ++++++++++++++++++++++++++++++------- 1 file changed, 58 insertions(+), 12 deletions(-) diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c index c258c7a..abe455c 100644 --- a/drivers/mtd/spi-nor/mtk-quadspi.c +++ b/drivers/mtd/spi-nor/mtk-quadspi.c @@ -404,6 +404,29 @@ static int mt8173_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf, return ret; } +static void mt8173_nor_disable_clk(struct mt8173_nor *mt8173_nor) +{ + clk_disable_unprepare(mt8173_nor->spi_clk); + clk_disable_unprepare(mt8173_nor->nor_clk); +} + +static int mt8173_nor_enable_clk(struct mt8173_nor *mt8173_nor) +{ + int ret; + + ret = clk_prepare_enable(mt8173_nor->spi_clk); + if (ret) + return ret; + + ret = clk_prepare_enable(mt8173_nor->nor_clk); + if (ret) { + clk_disable_unprepare(mt8173_nor->spi_clk); + return ret; + } + + return 0; +} + static int mtk_nor_init(struct mt8173_nor *mt8173_nor, struct device_node *flash_node) { @@ -468,15 +491,11 @@ static int mtk_nor_drv_probe(struct platform_device *pdev) return PTR_ERR(mt8173_nor->nor_clk); mt8173_nor->dev = &pdev->dev; - ret = clk_prepare_enable(mt8173_nor->spi_clk); + + ret = mt8173_nor_enable_clk(mt8173_nor); if (ret) return ret; - ret = clk_prepare_enable(mt8173_nor->nor_clk); - if (ret) { - clk_disable_unprepare(mt8173_nor->spi_clk); - return ret; - } /* only support one attached flash */ flash_np = of_get_next_available_child(pdev->dev.of_node, NULL); if (!flash_np) { @@ -487,10 +506,9 @@ static int mtk_nor_drv_probe(struct platform_device *pdev) ret = mtk_nor_init(mt8173_nor, flash_np); nor_free: - if (ret) { - clk_disable_unprepare(mt8173_nor->spi_clk); - clk_disable_unprepare(mt8173_nor->nor_clk); - } + if (ret) + mt8173_nor_disable_clk(mt8173_nor); + return ret; } @@ -498,11 +516,38 @@ static int mtk_nor_drv_remove(struct platform_device *pdev) { struct mt8173_nor *mt8173_nor = platform_get_drvdata(pdev); - clk_disable_unprepare(mt8173_nor->spi_clk); - clk_disable_unprepare(mt8173_nor->nor_clk); + mt8173_nor_disable_clk(mt8173_nor); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int mtk_nor_suspend(struct device *dev) +{ + struct mt8173_nor *mt8173_nor = dev_get_drvdata(dev); + + mt8173_nor_disable_clk(mt8173_nor); + return 0; } +static int mtk_nor_resume(struct device *dev) +{ + struct mt8173_nor *mt8173_nor = dev_get_drvdata(dev); + + return mt8173_nor_enable_clk(mt8173_nor); +} + +static const struct dev_pm_ops mtk_nor_dev_pm_ops = { + .suspend = mtk_nor_suspend, + .resume = mtk_nor_resume, +}; + +#define MTK_NOR_DEV_PM_OPS (&mtk_nor_dev_pm_ops) +#else +#define MTK_NOR_DEV_PM_OPS NULL +#endif + static const struct of_device_id mtk_nor_of_ids[] = { { .compatible = "mediatek,mt8173-nor"}, { /* sentinel */ } @@ -514,6 +559,7 @@ static int mtk_nor_drv_remove(struct platform_device *pdev) .remove = mtk_nor_drv_remove, .driver = { .name = "mtk-nor", + .pm = MTK_NOR_DEV_PM_OPS, .of_match_table = mtk_nor_of_ids, }, }; -- 1.7.9.5