MLK-17290-02 i2c: imx-lpi2c: manage irq resource request/release in runtime pm

Manage irq resource request/release in runtime pm to save irq domain's
power.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Tested-by: Guoniu.Zhou <guoniu.zhou@nxp.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index f7491ea..7257e71 100644 (file)
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -112,6 +112,7 @@ enum lpi2c_imx_pincfg {
 
 struct lpi2c_imx_struct {
        struct i2c_adapter      adapter;
+       int                     irq;
        struct clk              *clk_per;
        struct clk              *clk_ipg;
        void __iomem            *base;
@@ -562,7 +563,7 @@ static int lpi2c_imx_probe(struct platform_device *pdev)
 {
        struct lpi2c_imx_struct *lpi2c_imx;
        struct resource *res;
-       int irq, ret;
+       int ret;
 
        lpi2c_imx = devm_kzalloc(&pdev->dev, sizeof(*lpi2c_imx), GFP_KERNEL);
        if (!lpi2c_imx)
@@ -573,10 +574,10 @@ static int lpi2c_imx_probe(struct platform_device *pdev)
        if (IS_ERR(lpi2c_imx->base))
                return PTR_ERR(lpi2c_imx->base);
 
-       irq = platform_get_irq(pdev, 0);
-       if (irq < 0) {
+       lpi2c_imx->irq = platform_get_irq(pdev, 0);
+       if (lpi2c_imx->irq < 0) {
                dev_err(&pdev->dev, "can't get irq number\n");
-               return irq;
+               return lpi2c_imx->irq;
        }
 
        lpi2c_imx->adapter.owner        = THIS_MODULE;
@@ -603,14 +604,6 @@ static int lpi2c_imx_probe(struct platform_device *pdev)
        if (ret)
                lpi2c_imx->bitrate = LPI2C_DEFAULT_RATE;
 
-       ret = devm_request_irq(&pdev->dev, irq, lpi2c_imx_isr,
-                              IRQF_NO_SUSPEND,
-                              pdev->name, lpi2c_imx);
-       if (ret) {
-               dev_err(&pdev->dev, "can't claim irq %d\n", irq);
-               return ret;
-       }
-
        i2c_set_adapdata(&lpi2c_imx->adapter, lpi2c_imx);
        platform_set_drvdata(pdev, lpi2c_imx);
 
@@ -650,6 +643,7 @@ static int lpi2c_runtime_suspend(struct device *dev)
 {
        struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
 
+       devm_free_irq(dev, lpi2c_imx->irq, lpi2c_imx);
        clk_disable_unprepare(lpi2c_imx->clk_ipg);
        clk_disable_unprepare(lpi2c_imx->clk_per);
        pinctrl_pm_select_idle_state(dev);
@@ -675,6 +669,14 @@ static int lpi2c_runtime_resume(struct device *dev)
                dev_err(dev, "can't enable I2C ipg clock, ret=%d\n", ret);
        }
 
+       ret = devm_request_irq(dev, lpi2c_imx->irq, lpi2c_imx_isr,
+                               IRQF_NO_SUSPEND,
+                               dev_name(dev), lpi2c_imx);
+        if (ret) {
+                dev_err(dev, "can't claim irq %d\n", lpi2c_imx->irq);
+                return ret;
+        }
+
        return ret;
 }