linux-kernel - [PATCH] video: s3c-fb: Use platform_get

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Message-Id: <20220211032755.2271-1-zhaoxiao@uniontech.com>
Date:   Fri, 11 Feb 2022 11:27:55 +0800
From:   zhaoxiao <zhaoxiao@...ontech.com>
To:     jingoohan1@...il.com, deller@....de
Cc:     linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, zhaoxiao <zhaoxiao@...ontech.com>
Subject: [PATCH] video: s3c-fb: Use platform_get_irq() to get the interrupt

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 bypassed the hierarchical setup and messed 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: zhaoxiao <zhaoxiao@...ontech.com>
---
 drivers/video/fbdev/s3c-fb.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/video/fbdev/s3c-fb.c b/drivers/video/fbdev/s3c-fb.c
index 3b134e1bbc38..6ead7d3e2312 100644
--- a/drivers/video/fbdev/s3c-fb.c
+++ b/drivers/video/fbdev/s3c-fb.c
@@ -1360,7 +1360,6 @@ static int s3c_fb_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct s3c_fb_platdata *pd;
 	struct s3c_fb *sfb;
-	struct resource *res;
 	int win;
 	int ret = 0;
 	u32 reg;
@@ -1418,13 +1417,13 @@ static int s3c_fb_probe(struct platform_device *pdev)
 		goto err_lcd_clk;
 	}
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
+	sfb->irq_no = platform_get_irq(pdev, 0);
+	if (sfb->irq_no < 0) {
 		dev_err(dev, "failed to acquire irq resource\n");
 		ret = -ENOENT;
 		goto err_lcd_clk;
 	}
-	sfb->irq_no = res->start;
+
 	ret = devm_request_irq(dev, sfb->irq_no, s3c_fb_irq,
 			  0, "s3c_fb", sfb);
 	if (ret) {
-- 
2.20.1