Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 2ea68b75 authored by Guochun Mao's avatar Guochun Mao Committed by Cyrille Pitchen
Browse files

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: default avatarGuochun Mao <guochun.mao@mediatek.com>
Signed-off-by: default avatarCyrille Pitchen <cyrille.pitchen@wedev4u.fr>
parent 3c535c94

drivers/mtd/spi-nor/mtk-quadspi.c

+58 −12
Original line number Diff line number Diff line
@@ -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,

	},

};