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author | Guochun Mao <guochun.mao@mediatek.com> | 2017-09-21 15:45:06 +0300 |
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committer | Cyrille Pitchen <cyrille.pitchen@wedev4u.fr> | 2017-10-25 00:58:55 +0300 |
commit | 2ea68b75411b137f5782afa1052a5f1d99ef66f1 (patch) | |
tree | 5b1fd9ec92de84b534e3d3c71b2eb61369bb1533 | |
parent | 3c535c94a0ba94e9852de3aae7b6c62413eb2af7 (diff) | |
download | linux-2ea68b75411b137f5782afa1052a5f1d99ef66f1.tar.xz |
mtd: mtk-nor: add suspend/resume support
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 <guochun.mao@mediatek.com>
Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>
-rw-r--r-- | drivers/mtd/spi-nor/mtk-quadspi.c | 70 |
1 files changed, 58 insertions, 12 deletions
diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c index c258c7adf1c5..abe455ccd68b 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 struct platform_driver mtk_nor_driver = { .remove = mtk_nor_drv_remove, .driver = { .name = "mtk-nor", + .pm = MTK_NOR_DEV_PM_OPS, .of_match_table = mtk_nor_of_ids, }, }; |