> -----Original Message-----
> From: Aisheng Dong <aisheng.dong@xxxxxxx>
> Sent: Friday, March 19, 2021 12:54
> To: Clark Wang <xiaoning.wang@xxxxxxx>; shawnguo@xxxxxxxxxx;
> s.hauer@xxxxxxxxxxxxxx
> Cc: kernel@xxxxxxxxxxxxxx; festevam@xxxxxxxxx; dl-linux-imx <linux-
> imx@xxxxxxx>; sumit.semwal@xxxxxxxxxx; christian.koenig@xxxxxxx;
> linux-i2c@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx
> Subject: RE: [PATCH 04/11] i2c: imx-lpi2c: manage irq resource
> request/release in runtime pm
>
> > 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
devm_request_irq() will use device resource management.
Other resource like clk and struct space are all managed by devres.
Maybe we can still use devm_ to let devres manage irq here?
Thanks.
Best Regards,
Clark Wang
>
> > + 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
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