linux-kernel - [PATCH] dmaengine: mediatek: mtk-hsdma: Use platform_get

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Message-Id: <20220309053436.2081066-1-chi.minghao@zte.com.cn>
Date:   Wed,  9 Mar 2022 05:34:36 +0000
From:   cgel.zte@...il.com
To:     sean.wang@...iatek.com
Cc:     vkoul@...nel.org, matthias.bgg@...il.com,
        dmaengine@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Minghao Chi <chi.minghao@....com.cn>
Subject: [PATCH] dmaengine: mediatek: mtk-hsdma: Use platform_get_irq() to get the interrupt

From: Minghao Chi <chi.minghao@....com.cn>

It is not recommened to use platform_get_resource(pdev, IORESOURCE_IRQ)
for requesting IRQ's resources any more, as they can be not ready yet in
case of DT-booting.

platform_get_irq() instead is a recommended way for getting IRQ even if
it was not retrieved earlier.

It also makes code simpler because we're getting "int" value right away
and no conversion from resource to int is required.

Signed-off-by: Minghao Chi <chi.minghao@....com.cn>
---
 drivers/dma/mediatek/mtk-hsdma.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/dma/mediatek/mtk-hsdma.c b/drivers/dma/mediatek/mtk-hsdma.c
index 6ad8afbb95f2..d04d09016e83 100644
--- a/drivers/dma/mediatek/mtk-hsdma.c
+++ b/drivers/dma/mediatek/mtk-hsdma.c
@@ -897,7 +897,7 @@ static int mtk_hsdma_probe(struct platform_device *pdev)
 	struct mtk_hsdma_vchan *vc;
 	struct dma_device *dd;
 	struct resource *res;
-	int i, err;
+	int i, err, irq;
 
 	hsdma = devm_kzalloc(&pdev->dev, sizeof(*hsdma), GFP_KERNEL);
 	if (!hsdma)
@@ -923,13 +923,11 @@ 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;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	hsdma->irq = irq;
 
 	refcount_set(&hsdma->pc_refcnt, 0);
 	spin_lock_init(&hsdma->lock);
-- 
2.25.1