linux-kernel - Re: [PATCH v2 2/3] dmaengine: mediatek: mtk-hsdma: Use platform_get

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Message-ID: <YdZ9rDvYtdu8L8Vb@matsya>
Date:   Thu, 6 Jan 2022 10:57:08 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Sean Wang <sean.wang@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Prabhakar <prabhakar.csengg@...il.com>,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] dmaengine: mediatek: mtk-hsdma: Use
 platform_get_irq() to get the interrupt

On 04-01-22, 16:35, 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@...renesas.com>
> ---
> v1->v2
> * No change
> ---
>  drivers/dma/mediatek/mtk-hsdma.c | 11 ++++-------
>  1 file changed, 4 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/dma/mediatek/mtk-hsdma.c b/drivers/dma/mediatek/mtk-hsdma.c
> index 6ad8afbb95f2..c0fffde7fe08 100644
> --- a/drivers/dma/mediatek/mtk-hsdma.c
> +++ b/drivers/dma/mediatek/mtk-hsdma.c
> @@ -923,13 +923,10 @@ static int mtk_hsdma_probe(struct platform_device *pdev)
>  		return PTR_ERR(hsdma->clk);
>  	}
>  
> -	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
> -	if (!res) {
> -		dev_err(&pdev->dev, "No irq resource for %s\n",
> -			dev_name(&pdev->dev));
> -		return -EINVAL;
> -	}
> -	hsdma->irq = res->start;
> +	err = platform_get_irq(pdev, 0);

why not platform_get_irq_optional() here and 3rd patch ?

> +	if (err < 0)
> +		return err;
> +	hsdma->irq = err;
>  
>  	refcount_set(&hsdma->pc_refcnt, 0);
>  	spin_lock_init(&hsdma->lock);
> -- 
> 2.17.1

-- 
~Vinod