linux-kernel - Re: [PATCH v4] thermal: rcar_thermal: Use platform_get_irq

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Date:   Wed, 9 Mar 2022 11:59:24 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Niklas Söderlund <niklas.soderlund@...natech.se>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] thermal: rcar_thermal: Use platform_get_irq_optional()
 to get the interrupt

Hi Niklas,

On Mon, Jan 10, 2022 at 2:40 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> 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_optional().
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> ---
> v3->v4:
> * Updated check as suggested by Andy
>
> v2->v3:
> * Fixed review comment pointed by Andy
>
> v1->v2
> * Simplified checking error code
> * Break loop earlier if no interrupts are seen
>
> v1: https://lkml.org/lkml/2021/12/18/163
> ---
>  drivers/thermal/rcar_thermal.c | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
>
This patch is not in -next yet. In which release v5.18/19 do you plan
to merge this in?

Cheers,
Prabhakar

> diff --git a/drivers/thermal/rcar_thermal.c b/drivers/thermal/rcar_thermal.c
> index b49f04daaf47..1d729ed4d685 100644
> --- a/drivers/thermal/rcar_thermal.c
> +++ b/drivers/thermal/rcar_thermal.c
> @@ -445,7 +445,7 @@ static int rcar_thermal_probe(struct platform_device *pdev)
>         struct rcar_thermal_common *common;
>         struct rcar_thermal_priv *priv;
>         struct device *dev = &pdev->dev;
> -       struct resource *res, *irq;
> +       struct resource *res;
>         const struct rcar_thermal_chip *chip = of_device_get_match_data(dev);
>         int mres = 0;
>         int i;
> @@ -467,9 +467,16 @@ static int rcar_thermal_probe(struct platform_device *pdev)
>         pm_runtime_get_sync(dev);
>
>         for (i = 0; i < chip->nirqs; i++) {
> -               irq = platform_get_resource(pdev, IORESOURCE_IRQ, i);
> -               if (!irq)
> -                       continue;
> +               int irq;
> +
> +               ret = platform_get_irq_optional(pdev, i);
> +               if (ret < 0 && ret != -ENXIO)
> +                       goto error_unregister;
> +               if (ret > 0)
> +                       irq = ret;
> +               else
> +                       break;
> +
>                 if (!common->base) {
>                         /*
>                          * platform has IRQ support.
> @@ -487,7 +494,7 @@ static int rcar_thermal_probe(struct platform_device *pdev)
>                         idle = 0; /* polling delay is not needed */
>                 }
>
> -               ret = devm_request_irq(dev, irq->start, rcar_thermal_irq,
> +               ret = devm_request_irq(dev, irq, rcar_thermal_irq,
>                                        IRQF_SHARED, dev_name(dev), common);
>                 if (ret) {
>                         dev_err(dev, "irq request failed\n ");
> --
> 2.17.1
>