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ab7cabd09d
Compile-tested on: ramips/mt7621, x86/64. Run-tested on: ramips/mt7621. Signed-off-by: Stijn Segers <foss@volatilesystems.org>
129 lines
3.2 KiB
Diff
129 lines
3.2 KiB
Diff
From 8947f8cd407a55db816cd03fc03b59096210978e Mon Sep 17 00:00:00 2001
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From: Guochun Mao <guochun.mao@mediatek.com>
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Date: Thu, 21 Sep 2017 20:45:06 +0800
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Subject: [PATCH 136/224] mtd: mtk-nor: add suspend/resume support
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Abstract functions of clock setting, to avoid duplicated code,
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these functions been used in new feature.
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Implement suspend/resume functions.
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Signed-off-by: Guochun Mao <guochun.mao@mediatek.com>
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Signed-off-by: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>
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---
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drivers/mtd/spi-nor/mtk-quadspi.c | 70 ++++++++++++++++++++++++++++++++-------
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1 file changed, 58 insertions(+), 12 deletions(-)
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--- a/drivers/mtd/spi-nor/mtk-quadspi.c
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+++ b/drivers/mtd/spi-nor/mtk-quadspi.c
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@@ -404,6 +404,29 @@ static int mt8173_nor_write_reg(struct s
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return ret;
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}
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+static void mt8173_nor_disable_clk(struct mt8173_nor *mt8173_nor)
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+{
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+ clk_disable_unprepare(mt8173_nor->spi_clk);
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+ clk_disable_unprepare(mt8173_nor->nor_clk);
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+}
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+
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+static int mt8173_nor_enable_clk(struct mt8173_nor *mt8173_nor)
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+{
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+ int ret;
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+
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+ ret = clk_prepare_enable(mt8173_nor->spi_clk);
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+ if (ret)
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+ return ret;
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+
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+ ret = clk_prepare_enable(mt8173_nor->nor_clk);
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+ if (ret) {
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+ clk_disable_unprepare(mt8173_nor->spi_clk);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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static int mtk_nor_init(struct mt8173_nor *mt8173_nor,
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struct device_node *flash_node)
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{
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@@ -468,15 +491,11 @@ static int mtk_nor_drv_probe(struct plat
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return PTR_ERR(mt8173_nor->nor_clk);
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mt8173_nor->dev = &pdev->dev;
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- ret = clk_prepare_enable(mt8173_nor->spi_clk);
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+
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+ ret = mt8173_nor_enable_clk(mt8173_nor);
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if (ret)
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return ret;
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- ret = clk_prepare_enable(mt8173_nor->nor_clk);
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- if (ret) {
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- clk_disable_unprepare(mt8173_nor->spi_clk);
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- return ret;
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- }
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/* only support one attached flash */
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flash_np = of_get_next_available_child(pdev->dev.of_node, NULL);
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if (!flash_np) {
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@@ -487,10 +506,9 @@ static int mtk_nor_drv_probe(struct plat
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ret = mtk_nor_init(mt8173_nor, flash_np);
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nor_free:
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- if (ret) {
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- clk_disable_unprepare(mt8173_nor->spi_clk);
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- clk_disable_unprepare(mt8173_nor->nor_clk);
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- }
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+ if (ret)
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+ mt8173_nor_disable_clk(mt8173_nor);
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+
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return ret;
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}
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@@ -498,11 +516,38 @@ static int mtk_nor_drv_remove(struct pla
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{
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struct mt8173_nor *mt8173_nor = platform_get_drvdata(pdev);
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- clk_disable_unprepare(mt8173_nor->spi_clk);
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- clk_disable_unprepare(mt8173_nor->nor_clk);
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+ mt8173_nor_disable_clk(mt8173_nor);
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+
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+ return 0;
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+}
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+
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+#ifdef CONFIG_PM_SLEEP
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+static int mtk_nor_suspend(struct device *dev)
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+{
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+ struct mt8173_nor *mt8173_nor = dev_get_drvdata(dev);
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+
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+ mt8173_nor_disable_clk(mt8173_nor);
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+
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return 0;
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}
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+static int mtk_nor_resume(struct device *dev)
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+{
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+ struct mt8173_nor *mt8173_nor = dev_get_drvdata(dev);
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+
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+ return mt8173_nor_enable_clk(mt8173_nor);
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+}
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+
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+static const struct dev_pm_ops mtk_nor_dev_pm_ops = {
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+ .suspend = mtk_nor_suspend,
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+ .resume = mtk_nor_resume,
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+};
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+
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+#define MTK_NOR_DEV_PM_OPS (&mtk_nor_dev_pm_ops)
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+#else
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+#define MTK_NOR_DEV_PM_OPS NULL
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+#endif
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+
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static const struct of_device_id mtk_nor_of_ids[] = {
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{ .compatible = "mediatek,mt8173-nor"},
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{ /* sentinel */ }
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@@ -514,6 +559,7 @@ static struct platform_driver mtk_nor_dr
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.remove = mtk_nor_drv_remove,
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.driver = {
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.name = "mtk-nor",
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+ .pm = MTK_NOR_DEV_PM_OPS,
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.of_match_table = mtk_nor_of_ids,
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},
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};
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