[v1,2/2] mtd: mtk-nor: add suspend/resume support

Message ID 1505997906-30921-3-git-send-email-guochun.mao@mediatek.com
State Accepted
Delegated to: Cyrille Pitchen
Headers show
Series
  • [v1,1/2] dt-bindings: mtd: add new compatible strings and improve description
Related show

Commit Message

Guochun Mao Sept. 21, 2017, 12:45 p.m.
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>
---
 drivers/mtd/spi-nor/mtk-quadspi.c |   70 ++++++++++++++++++++++++++++++-------
 1 file changed, 58 insertions(+), 12 deletions(-)

Comments

Guochun Mao Oct. 11, 2017, 3:16 a.m. | #1
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@mediatek.com>
> ---
>  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,
>  	},
>  };
Cyrille Pitchen Oct. 24, 2017, 10:03 p.m. | #2
Le 21/09/2017 à 14:45, Guochun Mao a écrit :
> 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>

Applied to the spi-nor/next branch of l2-mtd

Thanks!

> ---
>  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,
>  	},
>  };
>

Patch

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,
 	},
 };