hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

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>
This commit is contained in:
Guochun Mao 2017-09-21 20:45:06 +08:00 committed by Cyrille Pitchen
parent 3c535c94a0
commit 2ea68b7541
1 changed files with 58 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

70
drivers/mtd/spi-nor/mtk-quadspi.c
View File

@ -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,
},
};