linux-kernel - Re: [PATCH] slimbus: qcom-ngd-ctrl: Use platform_get

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Date:   Thu, 10 Mar 2022 10:23:55 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org,
        alsa-devel <alsa-devel@...a-project.org>
Subject: Re: [PATCH] slimbus: qcom-ngd-ctrl: Use platform_get_irq() to get the interrupt

On Thu, Mar 10, 2022 at 10:16 AM Srinivas Kandagatla
<srinivas.kandagatla@...aro.org> wrote:
>
>
>
> On 24/12/2021 16:13, Lad Prabhakar wrote:
> > platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> > allocation of IRQ resources in DT core code, this causes an issue
>
> Are you saying that we should not be using platform_get_resource(pdev,
> IORESOURCE_IRQ, ...) on drivers that support DT?
>
> > when using hierarchical interrupt domains using "interrupts" property
> > in the node as this bypasses the hierarchical setup and messes up the
> > irq chaining.
>
> Should this not be fixed in the DT core itself?
>
Yes the plan is to fix in the DT core itself (refer [0]).

[0] https://patchwork.kernel.org/project/linux-renesas-soc/patch/20211209001056.29774-1-prabhakar.mahadev-lad.rj@bp.renesas.com/

> >
> > In preparation for removal of static setup of IRQ resource from DT core
> > code use platform_get_irq().
>
> I would prefer this patch to be part of the series that removes IRQ
> resource handling from DT core.
>
Since there are too many users (which are in different subsystems)
getting this all in single series would be a pain. As a result it is
split up into individual subsystems.

Cheers,
Prabhakar

>
> --srini
>
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > Hi,
> >
> > Dropping usage of platform_get_resource() was agreed based on
> > the discussion [0].
> >
> > [0] https://patchwork.kernel.org/project/linux-renesas-soc/
> > patch/20211209001056.29774-1-prabhakar.mahadev-lad.rj@...renesas.com/
> >
> > Cheers,
> > Prabhakar
> > ---
> >   drivers/slimbus/qcom-ngd-ctrl.c | 10 ++++------
> >   1 file changed, 4 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/slimbus/qcom-ngd-ctrl.c b/drivers/slimbus/qcom-ngd-ctrl.c
> > index 7040293c2ee8..0f29a08b4c09 100644
> > --- a/drivers/slimbus/qcom-ngd-ctrl.c
> > +++ b/drivers/slimbus/qcom-ngd-ctrl.c
> > @@ -1526,13 +1526,11 @@ static int qcom_slim_ngd_ctrl_probe(struct platform_device *pdev)
> >       if (IS_ERR(ctrl->base))
> >               return PTR_ERR(ctrl->base);
> >
> > -     res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> > -     if (!res) {
> > -             dev_err(&pdev->dev, "no slimbus IRQ resource\n");
> > -             return -ENODEV;
> > -     }
> > +     ret = platform_get_irq(pdev, 0);
> > +     if (ret < 0)
> > +             return ret;
> >
> > -     ret = devm_request_irq(dev, res->start, qcom_slim_ngd_interrupt,
> > +     ret = devm_request_irq(dev, ret, qcom_slim_ngd_interrupt,
> >                              IRQF_TRIGGER_HIGH, "slim-ngd", ctrl);
> >       if (ret) {
> >               dev_err(&pdev->dev, "request IRQ failed\n");