linux-kernel - [PATCH 2/2] mtd: rawnand: gpmi: Use platform_get_irq

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Message-Id: <20211221212609.31290-3-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Tue, 21 Dec 2021 21:26:09 +0000
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Han Xu <han.xu@....com>, Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        linux-mtd@...ts.infradead.org
Cc:     Rob Herring <robh+dt@...nel.org>, linux-kernel@...r.kernel.org,
        Prabhakar <prabhakar.csengg@...il.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH 2/2] mtd: rawnand: gpmi: Use platform_get_irq_byname() to get the interrupt

platform_get_resource_byname(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_byname().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
---
 drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
index feccff8bdd15..1b64c5a5140d 100644
--- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
@@ -991,16 +991,13 @@ static int acquire_bch_irq(struct gpmi_nand_data *this, irq_handler_t irq_h)
 {
 	struct platform_device *pdev = this->pdev;
 	const char *res_name = GPMI_NAND_BCH_INTERRUPT_RES_NAME;
-	struct resource *r;
 	int err;
 
-	r = platform_get_resource_byname(pdev, IORESOURCE_IRQ, res_name);
-	if (!r) {
-		dev_err(this->dev, "Can't get resource for %s\n", res_name);
-		return -ENODEV;
-	}
+	err = platform_get_irq_byname(pdev, res_name);
+	if (err < 0)
+		return err;
 
-	err = devm_request_irq(this->dev, r->start, irq_h, 0, res_name, this);
+	err = devm_request_irq(this->dev, err, irq_h, 0, res_name, this);
 	if (err)
 		dev_err(this->dev, "error requesting BCH IRQ\n");
 
-- 
2.17.1