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

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Message-ID: <c5ea7235-8642-6a89-f4ce-bd0861b6e4aa@linaro.org>
Date:   Thu, 10 Mar 2022 10:16:16 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        linux-kernel@...r.kernel.org, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org
Subject: Re: [PATCH] slimbus: qcom-ngd-ctrl: Use platform_get_irq() to get the
 interrupt



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?

> 
> 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.


--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");