linux-kernel - [PATCH v2 3/3] i2c: riic: Use platform_get

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Message-Id: <20211221175322.7096-4-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Tue, 21 Dec 2021 17:53:22 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Florian Fainelli <f.fainelli@...il.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Chris Brandt <chris.brandt@...esas.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-i2c@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Prabhakarprabhakar.csengg@...il.com,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v2 3/3] i2c: riic: 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>
---
v1->v2
* Dropped IRQ0 check
---
 drivers/i2c/busses/i2c-riic.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index 78b84445ee6a..8dfd27dc6149 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -433,12 +433,12 @@ static int riic_i2c_probe(struct platform_device *pdev)
 	}
 
 	for (i = 0; i < ARRAY_SIZE(riic_irqs); i++) {
-		res = platform_get_resource(pdev, IORESOURCE_IRQ, riic_irqs[i].res_num);
-		if (!res)
-			return -ENODEV;
+		ret = platform_get_irq(pdev, riic_irqs[i].res_num);
+		if (ret < 0)
+			return ret;
 
-		ret = devm_request_irq(&pdev->dev, res->start, riic_irqs[i].isr,
-					0, riic_irqs[i].name, riic);
+		ret = devm_request_irq(&pdev->dev, ret, riic_irqs[i].isr,
+				       0, riic_irqs[i].name, riic);
 		if (ret) {
 			dev_err(&pdev->dev, "failed to request irq %s\n", riic_irqs[i].name);
 			return ret;
-- 
2.17.1