> From: Clark Wang <xiaoning.wang@xxxxxxx>
> Sent: Wednesday, March 17, 2021 2:54 PM
>
> Manage irq resource request/release in runtime pm to save irq domain's
> power.
>
> Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
> Signed-off-by: Fugang Duan <fugang.duan@xxxxxxx>
> Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
> ---
> drivers/i2c/busses/i2c-imx-lpi2c.c | 26 ++++++++++++++------------
> 1 file changed, 14 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c
> b/drivers/i2c/busses/i2c-imx-lpi2c.c
> index 664fcc0dba51..e718bb6b2387 100644
> --- a/drivers/i2c/busses/i2c-imx-lpi2c.c
> +++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
> @@ -94,6 +94,7 @@ 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;
> @@ -543,7 +544,7 @@ static int lpi2c_imx_probe(struct platform_device
> *pdev) {
> struct lpi2c_imx_struct *lpi2c_imx;
> unsigned int temp;
> - int irq, ret;
> + int ret;
>
> lpi2c_imx = devm_kzalloc(&pdev->dev, sizeof(*lpi2c_imx), GFP_KERNEL);
> if (!lpi2c_imx)
> @@ -553,9 +554,9 @@ 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)
> - return irq;
> + lpi2c_imx->irq = platform_get_irq(pdev, 0);
> + if (lpi2c_imx->irq < 0)
> + return lpi2c_imx->irq;
>
> lpi2c_imx->adapter.owner = THIS_MODULE;
> lpi2c_imx->adapter.algo = &lpi2c_imx_algo;
> @@ -581,14 +582,6 @@ static int lpi2c_imx_probe(struct platform_device
> *pdev)
> if (ret)
> lpi2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ;
>
> - 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);
>
> @@ -640,6 +633,7 @@ static int __maybe_unused
> 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);
> @@ -665,6 +659,14 @@ static int __maybe_unused
> 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,
I guess unnecessary to use devm in rpm
> + 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;
> }
>
> --
> 2.25.1
