Hi Florian,
On Sat, Dec 18, 2021 at 10:44 PM Lad, Prabhakar
<prabhakar.csengg@xxxxxxxxx> wrote:
>
> Hi Florian,
>
> Thank you for the review.
>
> On Sat, Dec 18, 2021 at 9:17 PM Florian Fainelli <f.fainelli@xxxxxxxxx> wrote:
> >
> >
> >
> > On 12/18/2021 8:52 AM, Lad Prabhakar wrote:
> > > platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> > > allocation of IRQ resources in DT core code, this causes an issue
> > > when using hierarchical interrupt domains using "interrupts" property
> > > in the node as this bypasses the hierarchical setup and messes up the
> > > irq chaining.
> > >
> > > In preparation for removal of static setup of IRQ resource from DT core
> > > code use platform_get_irq().
> > >
> > > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@xxxxxxxxxxxxxx>
> >
> > Just one nit below:
> > > ---
> > > drivers/i2c/busses/i2c-bcm2835.c | 11 ++++-------
> > > 1 file changed, 4 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
> > > index 37443edbf754..d63dec5f3cb1 100644
> > > --- a/drivers/i2c/busses/i2c-bcm2835.c
> > > +++ b/drivers/i2c/busses/i2c-bcm2835.c
> > > @@ -402,7 +402,7 @@ static const struct i2c_adapter_quirks bcm2835_i2c_quirks = {
> > > static int bcm2835_i2c_probe(struct platform_device *pdev)
> > > {
> > > struct bcm2835_i2c_dev *i2c_dev;
> > > - struct resource *mem, *irq;
> > > + struct resource *mem;
> > > int ret;
> > > struct i2c_adapter *adap;
> > > struct clk *mclk;
> > > @@ -452,12 +452,9 @@ static int bcm2835_i2c_probe(struct platform_device *pdev)
> > > return ret;
> > > }
> > >
> > > - irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > > - if (!irq) {
> > > - dev_err(&pdev->dev, "No IRQ resource\n");
> > > - return -ENODEV;
> > > - }
> > > - i2c_dev->irq = irq->start;
> > > + i2c_dev->irq = platform_get_irq(pdev, 0);
> > > + if (i2c_dev->irq <= 0)
> > > + return i2c_dev->irq ? i2c_dev->irq : -ENXIO;
> >
> > Why not just check for a negative return code and propagate it as is?
> >
> platform_get_irq() may return 0 said that we do get a splat in this
> case and further request_irq() will fail so instead check it here.
>
My bad, just the negative check should suffice.
Cheers,
Prabhakar
