linux-kernel - [PATCH 1/6] usb: host: fotg210: Use platform_get

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Message-Id: <20211220010411.12075-2-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Mon, 20 Dec 2021 01:04:06 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, Peter Chen <peter.chen@...nel.org>,
        Pawel Laszczak <pawell@...ence.com>,
        Roger Quadros <rogerq@...nel.org>,
        Aswath Govindraju <a-govindraju@...com>,
        Felipe Balbi <balbi@...nel.org>,
        Rui Miguel Silva <rui.silva@...aro.org>,
        Bin Liu <b-liu@...com>
Cc:     linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH 1/6] usb: host: fotg210: 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 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>
---
 drivers/usb/host/fotg210-hcd.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/host/fotg210-hcd.c b/drivers/usb/host/fotg210-hcd.c
index b590995a6b3e..7af17c8e069b 100644
--- a/drivers/usb/host/fotg210-hcd.c
+++ b/drivers/usb/host/fotg210-hcd.c
@@ -5576,14 +5576,9 @@ static int fotg210_hcd_probe(struct platform_device *pdev)
 
 	pdev->dev.power.power_state = PMSG_ON;
 
-	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
-	if (!res) {
-		dev_err(dev, "Found HC with no IRQ. Check %s setup!\n",
-				dev_name(dev));
-		return -ENODEV;
-	}
-
-	irq = res->start;
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
 
 	hcd = usb_create_hcd(&fotg210_fotg210_hc_driver, dev,
 			dev_name(dev));
-- 
2.17.1