gentle ping...
On Thu, 2017-09-21 at 20:45 +0800, Guochun Mao wrote:
> 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@xxxxxxxxxxxx>
> ---
> 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,
> },
> };
--
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